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Bhatia M, Suliman H, Ahmed R, Kostadinov D, Singhal T. Radiation Proctitis: A Review of Pathophysiology and Treatment Strategies. Cureus 2024; 16:e70581. [PMID: 39483948 PMCID: PMC11525059 DOI: 10.7759/cureus.70581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/30/2024] [Indexed: 11/03/2024] Open
Abstract
Radiotherapy (RT) has become an integral part of cancer treatment worldwide; it aims to arrest the uncontrolled growth of tumor cells by using high-energy rays. Radiation proctitis is a known clinical manifestation after the RT regime for pelvic malignancies. Radiation proctitis can have a variable presentation, and there are a lot of patient-related factors that can affect the eventual outcome. In most instances, it is self-limiting; however, it can become chronic in some cases and can affect the quality of life. Many treatment options are recommended, but there has been no consensus on the treatment protocols for managing this known clinical condition. We have tried to briefly describe its pathogenesis, important factors affecting the outcome, and available treatment strategies.
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Affiliation(s)
- Mohit Bhatia
- Colorectal and General Surgery, Princess Royal University Hospital, King's College Hospital NHS Foundation Trust, London, GBR
| | - Hadeel Suliman
- Colorectal and General Surgery, Princess Royal University Hospital, King's College Hospital NHS Foundation Trust, London, GBR
| | - Rizwan Ahmed
- General Surgery, Princess Royal University Hospital, King's College Hospital NHS Foundation Trust, London, GBR
| | - Danko Kostadinov
- Colorectal and General Surgery, Princess Royal University Hospital, King's College Hospital NHS Foundation Trust, London, GBR
| | - Tarun Singhal
- Colorectal and General Surgery, Princess Royal University Hospital, King's College Hospital NHS Foundation Trust, London, GBR
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Ong AL, Knight K, Panettieri V, Dimmock M, Tuan JK, Tan HQ, Wright C. Dose-volume analysis of planned versus accumulated dose as a predictor for late gastrointestinal toxicity in men receiving radiotherapy for high-risk prostate cancer. Phys Imaging Radiat Oncol 2022; 23:97-102. [PMID: 35879938 PMCID: PMC9307677 DOI: 10.1016/j.phro.2022.07.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 07/02/2022] [Accepted: 07/06/2022] [Indexed: 11/26/2022] Open
Abstract
Interfractional variations in organs at risk were observed in prostate radiotherapy. Rectal accumulated dose was significantly higher at the intermediate-high dose region. Rectal planned dose was significantly higher at the very high dose region. Dose>78.2 Gy to 0.03 cc of rectum was predictive of late Grade 2 toxicity. Patient age>72 years was predictive of late Grade 2 rectal toxicity.
Background and purpose Significant dose deviations have been reported between planned (DP) and accumulated (DA) dose in prostate radiotherapy. This study aimed to develop multivariate analysis (MVA) models associating Grade 1 and 2 gastrointestinal (GI) toxicity with clinical and DP or DA dosimetric variables separately. Materials and methods Dose volume (DV) metrics were compared between DA and DP for 150 high-risk prostate cancer patients. MV models were generated from significant clinical and dosimetric variables (p < 0.05) at univariate level. Dose-based-region of interest (DB-ROI) metrics were included. Model performance was measured, and additional subgroup analysis were performed. Results Rectal DA demonstrated a higher intermediate-high dose (V30-65 Gy and DB-ROI at 15–50 mm) compared to DP. Conversely, at the very high dose region, rectal DA (V75 Gy and DB-ROI at 5–10 mm) were significantly lower. In MVA, rectal DB-ROI at 10 mm was predictive for Grade ≥ 1 GI toxicity for DA and DP. Age, rectal DA for D0.03 cc, and rectal DP for DB-ROI 10 mm were predictors for Grade 2 GI toxicity. Subgroup analysis revealed that patients ≥ 72 years old and a rectal DA of ≥ 78.2 Gy were highly predictive of Grade 2 GI toxicity. Conclusions The dosimetric impact of a higher dose rectal dose in DA due to volumetric changes was minimal and was not predictive of detrimental clinical toxicity apart from rectal D0.03 cc ≥ 78.2 Gy for Grade 2 GI toxicity. The use of the DB-ROI method can provide equivalent predictive power as the DV method in toxicity prediction.
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Tenti MV, Ingrosso G, Bini V, Mariucci C, Saldi S, Alì E, Zucchetti C, Bellavita R, Aristei C. Tomotherapy-based moderate hypofractionation for localized prostate cancer: a mono-institutional analysis. Rep Pract Oncol Radiother 2022; 27:142-151. [PMID: 35402018 PMCID: PMC8989459 DOI: 10.5603/rpor.a2022.0012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 01/21/2022] [Indexed: 11/25/2022] Open
Abstract
Background To date, few studies have been published on image-guided helical tomotherapy (HT) in a moderate hypofractionation of localized PCa. We report outcome and toxicity of localized PCa patients treated with HT-based moderate hypofractionated radiotherapy. Materials and methods 76 patients were retrospectively analyzed. A total dose of 60 Gy (20 × 3 Gy) or 67.5 Gy (25 × 2.7 Gy) was prescribed. The χ2 test was used to analyze associations between toxicity and dosimetric and clinical parameters. The Cox proportional hazard regression model was used for multivariate analysis. Kaplan-Meier method was used for survival analysis. Results median follow-up was 42.26 months [interquartile (IQR), 23-76). At 4-year, overall survival (OS) and metastasis-free survival (MFS) were 91% and 89%, respectively. At multivariate analysis, smoking habitude was associated with MFS [hazard ratio (HR) 7.32, 95% CI: 1.57-34.16, p = 0.011]. Acute and late grade ≥ 2 gastro-intestinal (GI) toxicity was observed in 6.5% and 2.6% of patients, respectively. Acute and late grade ≥ 2 genito-urinary (GU) toxicity were 31.5% and 3.9%. Four-year late GI and GU grade ≥ 2 toxicity were 3% and 7%, respectively. Acute GI toxicity was associated with statins medication (p = 0.04) and androgen deprivation therapy (p = 0.013). Acute GU toxicity was associated with the use of anticoagulants (p = 0.029) and antiaggregants (p = 0.013). Conclusions HT-based moderate hypofractionation shows very low rates of toxicity. Smoking habitude is associated with the risk of developing metastases after radical treatment for localized PCa.
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Affiliation(s)
- Maria Valentina Tenti
- Radiation Oncology Section, Department of Medicine and Surgery, University of Perugia, Italy
| | - Gianluca Ingrosso
- Radiation Oncology Section, Department of Medicine and Surgery, University of Perugia, Italy
| | - Vittorio Bini
- Internal Medicine, Endocrine and Metabolic Science Section, University of Perugia, Italy
| | - Cristina Mariucci
- Department of Oncology and Radiotherapy, Azienda Ospedaliero Universitaria Ospedali Riuniti, Ancona, Italy
| | - Simonetta Saldi
- Radiation Oncology Section, Perugia General Hospital, Perugia, Italy
| | - Emanuele Alì
- Radiation Oncology Section, Department of Medicine and Surgery, University of Perugia, Italy
| | - Claudio Zucchetti
- Section of Medical Physics, Perugia General Hospital, Perugia, Italy
| | - Rita Bellavita
- Radiation Oncology Section, Perugia General Hospital, Perugia, Italy
| | - Cynthia Aristei
- Radiation Oncology Section, Department of Medicine and Surgery, University of Perugia, Italy
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Extermann M, Chetty IJ, Brown SL, Al-Jumayli M, Movsas B. Predictors of Toxicity Among Older Adults with Cancer. Semin Radiat Oncol 2022; 32:179-185. [DOI: 10.1016/j.semradonc.2021.11.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Lima SVMA, de Araújo KCGM, Nunes MAP, Nunes C. Early identification of individuals at risk for loss to follow-up of tuberculosis treatment: A generalised hierarchical analysis. Heliyon 2021; 7:e06788. [PMID: 33981876 PMCID: PMC8085707 DOI: 10.1016/j.heliyon.2021.e06788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 03/03/2021] [Accepted: 04/09/2021] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND We characterise the loss to follow-up (locally termed abandoned) of tuberculosis treatment with individual and ecological health determinants and to identify the predictive capacity of these risk factors. METHODS A cohort study with individual and ecological characterisation of patients diagnosed with tuberculosis in Sergipe/Brazil from 2015 to 2018 with either loss to follow-up or completion of treatment as a therapeutic outcome was performed. The examined variables were based on the social determinants of health with descriptive analysis, binary logistic regression, a generalised hierarchical model and graphical presentation using a nomogram. RESULTS The loss to follow-up accounted for 18.21% of the 2,449 studied cases. The characteristics revealed that the highest abandonment percentages were people who: were male (20.0%), had black skin colour (20.3%), were aged 20-39 years (21.8%), had 4-7 years of schooling (23.6%), re-entered treatment after abandonment (36.5%), used alcohol (31.0%), used drugs (39.3%), were smokers (26.5%) and were homeless (55.4%). The ecological characteristics showed that individuals living in municipalities with a high human development index (HDI; odds ratio [OR]: 1.91) and high-income inequality (OR: 1.81) had a greater chance of not finishing the treatment. Most of these variables were identified as predictors in the generalised hierarchical model; the receiver operating characteristic curve (ROC) curve had 0.771 precision and 84.0% accuracy. CONCLUSION The group of identified characteristics influenced the loss to follow-up of tuberculosis treatment. This data provides evidence for the early identification of individuals who are at greater risk of abandoning tuberculosis treatment.
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Affiliation(s)
- Shirley Verônica Melo Almeida Lima
- Post-Graduate Program in Health Sciences, Federal University of Sergipe, Brazil
- NOVA National School of Public Health, Universidade NOVA de Lisboa, Portugal
| | | | | | - Carla Nunes
- NOVA National School of Public Health, Universidade NOVA de Lisboa, Portugal
- Public Health Research Centre, Universidade NOVA de Lisboa, Portugal
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Stanić J, Stanković V, Nikitović M. Radiation toxicity in prostate cancer patients. MEDICINSKI PODMLADAK 2021. [DOI: 10.5937/mp72-32377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Prostate cancer (PC) is the most frequent male tumor, accounting for about one-third of all cancers in men. Since survival is often favorable regardless of therapy, treatment decisions may depend on therapy-specific health outcomes. The majority of men initially diagnosed with localized PC ultimately die with, rather than of, their disease. As a result, men who are diagnosed will live many years with the treatment's sequelae. The major therapeutic strategies include radical prostatectomy or external beam radiotherapy. Radiotherapy is one of the curative treatment options. The tumor dose-response relationship has been studied and is widely accepted. The unsatisfactory local control with doses < 70 Gy led to dose escalation using highly precise radiotherapy techniques - three-dimensional conformal radiotherapy and intensity-modulated radiotherapy enabling the delivery of high radiation doses up to 74 - 78 Gy. Bowel, rectal and urinary toxicities are the principal limiting factors in delivering a high dose. Acute symptoms include a change in bowel habits, urgency, and fecal incontinence. The most commonly reported late toxicities were chronic diarrhea, proctitis, or rectal bleeding. Several factors have been associated with increased gastrointestinal toxicity such as larger bowel volume receiving high doses, the patient's age, diabetes, and concomitant use of androgen deprivation therapy. Bladder damage resulting from acute radiation toxicity is manifested as radiation cystitis (frequent urination and dysuric disorders). Smoking, previous abdominopelvic surgeries and the use of diuretics significantly affect the occurrence of acute genitourinary toxicity grade ≥ 2. Risk factors for the development of late genitourinary complications are higher radiation dose, previous urinary problems, transurethral interventions, and acute genitourinary complications. It is essential to strike a balance between the therapeutic benefits and radiotherapy side effects. Severe late complications significantly reduce the quality of life (QOL) of PC survivors. Early detection and proper evaluation of complications are especially important in increasing the patient's QOL.
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Taylor JM, Chen VE, Miller RC, Greenberger BA. The Impact of Prostate Cancer Treatment on Quality of Life: A Narrative Review with a Focus on Randomized Data. Res Rep Urol 2020; 12:533-546. [PMID: 33150144 PMCID: PMC7605665 DOI: 10.2147/rru.s243088] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 10/06/2020] [Indexed: 01/03/2023] Open
Abstract
Despite excellent oncologic outcomes, the management of localized prostate cancer remains complex and is dependent on multiple factors, including patient life expectancy, medical comorbidities, tumor characteristics, and genetic risk factors. Decades of iterative clinical trials have improved the optimization and utilization of surgical and radiation-based modalities, as well as their combinatorial use with anti-androgen and systemic therapies. While cure rates are high and converging on equivalent disease control should an upfront surgical or radiotherapeutic approach be optimized, the long-term side effects of surgical and radiation-based treatments can differ significantly in nature. Decisions regarding the selection of therapy are therefore best made in an informed and shared medical decision-making process between clinician and patient with respect to cancer control as well as adverse effects. We outline in this narrative review an understanding regarding implications of surgical and radiation treatment on quality of life after treatment, and how these data may be considered in the context of advising patients regarding the selection of therapy. This narrative review largely focuses on the quality of life data obtained from prospective randomized trials of men treated for prostate cancer. We believe this provides the best assessment of the quality of life and can be used to inform patients when making treatment decisions.
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Affiliation(s)
- James M Taylor
- Department of Radiation Oncology, Sidney Kimmel Medical College & Cancer Center at Thomas Jefferson University, Philadelphia, PA, USA
| | - Victor E Chen
- Department of Radiation Oncology, Sidney Kimmel Medical College & Cancer Center at Thomas Jefferson University, Philadelphia, PA, USA
| | - Ryan C Miller
- Department of Radiation Oncology, Sidney Kimmel Medical College & Cancer Center at Thomas Jefferson University, Philadelphia, PA, USA
| | - Benjamin A Greenberger
- Department of Radiation Oncology, Sidney Kimmel Medical College & Cancer Center at Thomas Jefferson University, Philadelphia, PA, USA
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Caulfield S, Menezes G, Marignol L, Poole C. Nomograms are key decision-making tools in prostate cancer radiation therapy. Urol Oncol 2018; 36:283-292. [PMID: 29680180 DOI: 10.1016/j.urolonc.2018.03.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 02/16/2018] [Accepted: 03/22/2018] [Indexed: 12/25/2022]
Abstract
BACKGROUND The use of nomograms for predicting clinical endpoints has been well documented. Nomograms provide an individualized prognosis and help clinicians determine the effectiveness of treatment for a given patient. Early identification of potential treatment failure or toxicity allows alternative approaches to be considered, reducing unnecessary treatment, morbidity, and cost. This review aims to evaluate clinical potential of nomogram use for the management of prostate cancer radiotherapy patients. METHODS PubMed, Embase, and Scopus were searched for literature published between 2006 and 2016. The reported correlation between measured and nomogram-predicted probabilities of biochemical control, disease progression, survival and toxicity was reviewed, through an analysis of concordance indexes and areas under the curves. RESULTS Sixteen studies were reviewed. Outcomes predicted by the nomogram were very close to outcomes measured (concordance index of 0.7 and above) in the majority. But a combination of under and overestimation of outcome was also reported. The predictive accuracy of nomograms was very variable, however, most nomograms had accuracy greater than chance, indicated by a concordance index higher than 0.5. CONCLUSION Nomograms can be used as prognostic guides to aid clinical decision-making for prostate cancer patients until further research addresses the limitations presented in this review. Strict definitions of end points should be added to future models and perhaps models could be enhanced with the incorporation of genomic variables or tumor specific parameters.
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Affiliation(s)
- Sarah Caulfield
- Trinity College Dublin, Applied Radiation Therapy Trinity Research Group, Discipline of Radiation Therapy, School of Medicine, Dublin, Ireland
| | - Gerard Menezes
- Trinity College Dublin, Applied Radiation Therapy Trinity Research Group, Discipline of Radiation Therapy, School of Medicine, Dublin, Ireland
| | - Laure Marignol
- Trinity College Dublin, Applied Radiation Therapy Trinity Research Group, Discipline of Radiation Therapy, School of Medicine, Dublin, Ireland
| | - Claire Poole
- Trinity College Dublin, Applied Radiation Therapy Trinity Research Group, Discipline of Radiation Therapy, School of Medicine, Dublin, Ireland.
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Ballare A, Di Salvo M, Loi G, Ferrari G, Beldì D, Krengli M. Conformal Radiotherapy of Clinically Localized Prostate Cancer: Analysis of Rectal and Urinary Toxicity and Correlation with Dose-Volume Parameters. TUMORI JOURNAL 2018; 95:160-8. [DOI: 10.1177/030089160909500206] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Aims and background Rectal and urinary toxicities are the principal limiting factors in delivering a high target dose to patients affected by prostate cancer. The verification of such toxicity is an important step before starting a dose-escalation program. The present observational study reports on the acute and late rectal and urinary toxicity in relation with dose-volume parameters in 104 patients with localized prostate cancer treated with 3-dimensional conformal radiation therapy. Methods and study design One hundred and four patients with stage T1b-T3b prostate cancer were treated with three-dimensional conformal radiation therapy to a total dose of 74 Gy, 2 Gy per fraction. Rigid dose constraints were applied for rectum and bladder. Acute and late rectal and urinary toxicities were analyzed also in relation to dose-volume histograms. Biochemical relapse-free survival was defined according to the American Society of Therapeutic Radiation Oncology (ASTRO) criteria and to the RTOG-ASTRO Phoenix Consensus Conference Recommendations using the Kaplan-Meier method. Results No grade 3 toxicity was observed. Acute and late grade 2 toxicity rates were 5.8% and 9.0% for rectum and 12.5% and 2.0% for bladder, respectively. Rectal V70 influenced the occurrence of late grade 2 toxicity. A relationship between acute and late urinary toxicity was also found. After a median follow-up of 30 months (range, 20–50), the actuarial overall and biochemical relapse-free survival rates were 84% and 77%, respectively, with a significant difference between low-intermediate and high-risk patients. Conclusions Conformal radiotherapy to the dose of 74 Gy was administered with good compliance. The incidence of acute and late toxicity was relatively low in accord with our dose constraints. Rectal V70 proved to be a reliable prognosticator of late toxicity. Overall survival and biochemical relapse-free survival rates were more favorable for low and intermediate-risk and significantly less favorable for high-risk patients.
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Affiliation(s)
- Andrea Ballare
- Radiotherapy, University of Piemonte Orientale Amedeo Avogadro and Hospital Maggiore della Carità, Novara, Italy
| | - Maurizio Di Salvo
- Radiotherapy, University of Piemonte Orientale Amedeo Avogadro and Hospital Maggiore della Carità, Novara, Italy
| | - Gianfranco Loi
- Medical Physics, Hospital Maggiore della Carità, Novara, Italy
| | - Gianmarco Ferrari
- Radiotherapy, University of Piemonte Orientale Amedeo Avogadro and Hospital Maggiore della Carità, Novara, Italy
| | - Debora Beldì
- Radiotherapy, University of Piemonte Orientale Amedeo Avogadro and Hospital Maggiore della Carità, Novara, Italy
| | - Marco Krengli
- Radiotherapy, University of Piemonte Orientale Amedeo Avogadro and Hospital Maggiore della Carità, Novara, Italy
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Independent component analysis for rectal bleeding prediction following prostate cancer radiotherapy. Radiother Oncol 2017; 126:263-269. [PMID: 29203291 DOI: 10.1016/j.radonc.2017.11.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 11/18/2017] [Accepted: 11/20/2017] [Indexed: 11/22/2022]
Abstract
BACKGROUND AND PURPOSE To evaluate the benefit of independent component analysis (ICA)-based models for predicting rectal bleeding (RB) following prostate cancer radiotherapy. MATERIALS AND METHODS A total of 593 irradiated prostate cancer patients were prospectively analyzed for Grade ≥2 RB. ICA was used to extract two informative subspaces (presenting RB or not) from the rectal DVHs, enabling a set of new pICA parameters to be estimated. These DVH-based parameters, along with others from the principal component analysis (PCA) and functional PCA, were compared to "standard" features (patient/treatment characteristics and DVH bins) using the Cox proportional hazards model for RB prediction. The whole cohort was divided into: (i) training (N = 339) for ICA-based subspace identification and Cox regression model identification and (ii) validation (N = 254) for RB prediction capability evaluation using the C-index and the area under the receiving operating curve (AUC), by comparing predicted and observed toxicity probabilities. RESULTS In the training cohort, multivariate Cox analysis retained pICA and PC as significant parameters of RB with 0.65 C-index. For the validation cohort, the C-index increased from 0.64 when pICA was not included in the Cox model to 0.78 when including pICA parameters. When pICA was not included, the AUC for 3-, 5-, and 8-year RB prediction were 0.68, 0.66, and 0.64, respectively. When included, the AUC increased to 0.83, 0.80, and 0.78, respectively. CONCLUSION Among the many various extracted or calculated features, ICA parameters improved RB prediction following prostate cancer radiotherapy.
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Development of a virtual spacer to support the decision for the placement of an implantable rectum spacer for prostate cancer radiotherapy: Comparison of dose, toxicity and cost-effectiveness. Radiother Oncol 2017; 125:107-112. [DOI: 10.1016/j.radonc.2017.07.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 07/12/2017] [Accepted: 07/25/2017] [Indexed: 02/06/2023]
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Sini C, Noris Chiorda B, Gabriele P, Sanguineti G, Morlino S, Badenchini F, Cante D, Carillo V, Gaetano M, Giandini T, Landoni V, Maggio A, Perna L, Petrucci E, Sacco V, Valdagni R, Rancati T, Fiorino C, Cozzarini C. Patient-reported intestinal toxicity from whole pelvis intensity-modulated radiotherapy: First quantification of bowel dose-volume effects. Radiother Oncol 2017; 124:296-301. [PMID: 28739383 DOI: 10.1016/j.radonc.2017.07.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 06/06/2017] [Accepted: 07/06/2017] [Indexed: 10/19/2022]
Abstract
BACKGROUND AND PURPOSE Intestinal toxicity is commonly experienced during whole-pelvis intensity-modulated radiotherapy (WPRT) for prostate cancer. The aim of the current study was to assess bowel dose-volume relationships for acute patient-reported intestinal symptoms of patients treated with WPRT for prostate cancer. MATERIALS AND METHODS Complete data of 206 patients were available; the median dose to pelvic nodes was 51.8Gy (range 50.4-54.4, 1.7-2Gy/fr). Intestinal symptoms were assessed as changes in the Inflammatory Bowel Disease Questionnaire scores relative to the Bowel Domain (IBDQ-B) between baseline and radiotherapy mid-point/end. The 25th percentiles of the most severe worsening from baseline (ΔIBDQ-B) were set as end-points. The impact of bowel loops and sigmoid colon dose-volume/surface parameters as well as selected clinical parameters were investigated using multivariate logistic regression. RESULTS Analyses were focused on the four questions showing a median ΔIBDQ-B>0. No dose volume/surface parameters were predictive, other than ΔIBDQ5≥3 (loose stools): when grouping patients according to bowel DVHs (high risk: V20>470cc, V30>245cc, V42>110cc; low risk: all the remaining patients), a two-variable model including high-risk DVH-shape (OR: 9.3) and age (protective, OR: 0.94) was assessed. The model showed good calibration (slope: 1.003, R2=0.92) and was found to be robust after bootstrap-based internal validation. CONCLUSIONS Constraining the bowel loops may reduce the risk of loose stools. The risk is higher for younger patients.
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Affiliation(s)
- Carla Sini
- Medical Physics, San Raffaele Scientific Institute, Milano, Italy
| | | | - Pietro Gabriele
- Radiotherapy Department, Candiolo Cancer Institute - FPO, IRCCS, Italy
| | - Giuseppe Sanguineti
- Department of Radiotherapy, Regina Elena National Cancer Institute, Rome, Italy
| | - Sara Morlino
- Radiation Oncology 1, Fondazione IRCCS Istituto Nazionale Tumori, Milano, Italy
| | - Fabio Badenchini
- Prostate Cancer Program, Fondazione IRCCS Istituto Nazionale Tumori, Milano, Italy
| | | | - Viviana Carillo
- Radiotherapy, Centro AKTIS Diagnostica e terapia, Napoli, Italy
| | | | - Tommaso Giandini
- Medical Physics, Fondazione IRCCS Istituto Nazionale Tumori, Milano, Italy
| | - Valeria Landoni
- Department of Physics, Regina Elena National Cancer Institute, Rome, Italy
| | - Angelo Maggio
- Medical Physics Department, Candiolo Cancer Institute - FPO, IRCCS, Italy
| | - Lucia Perna
- Medical Physics, San Raffaele Scientific Institute, Milano, Italy
| | | | - Vincenzo Sacco
- Radiotherapy, San Raffaele Scientific Institute, Milano, Italy
| | - Riccardo Valdagni
- Radiation Oncology 1, Fondazione IRCCS Istituto Nazionale Tumori, Milano, Italy; Prostate Cancer Program, Fondazione IRCCS Istituto Nazionale Tumori, Milano, Italy; UNIV Hematology and Hemato-Oncology, Università degli Studi di Milano, Italy
| | - Tiziana Rancati
- Prostate Cancer Program, Fondazione IRCCS Istituto Nazionale Tumori, Milano, Italy
| | - Claudio Fiorino
- Medical Physics, San Raffaele Scientific Institute, Milano, Italy.
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Volumetric image-guided highly conformal radiotherapy of the prostate bed: Toxicity analysis. Rep Pract Oncol Radiother 2016; 22:64-70. [PMID: 27920610 DOI: 10.1016/j.rpor.2016.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Revised: 07/24/2016] [Accepted: 10/21/2016] [Indexed: 11/23/2022] Open
Abstract
AIM To evaluate toxicity of high conformal image-guided radiotherapy of the prostate bed. BACKGROUND Radiotherapy of the prostate bed has a pivotal role in the post-operative and salvage settings, but few clinical data are available on the use of daily image guidance in combination with highly conformal techniques, and data on long-term results are lacking. MATERIALS AND METHODS We analyzed 118 patients irradiated on the prostate bed using conformal plans processed with a micro-multileaf collimator, and daily checking treatment set-up with a cone-beam CT system. Correlation between toxicity and clinical-dosimetric parameters was assessed by the Cox regression model and log-rank test. Survival analyses were performed with the Kaplan-Meier method. RESULTS Median follow-up was 54.08 months. Late grade ≥2 gastro-intestinal (GI) and genito-urinary (GU) toxicity were 3.4% and 4.2%, respectively. Actuarial 4-year late grade ≥2 GI and GU toxicities were 4% and 6%, respectively. Four-year relapse-free survival was 87%. At log-rank test, acute grade ≥2 GI toxicity is associated with the use of antihypertensives (p = 0.03), and there is a trend toward significance between the use of anticoagulants and late grade ≥2 GI toxicity (p = 0.07). At Cox analysis, acute grade ≥2 GU toxicity is correlated with the percentage of bladder volume receiving more than 65 Gy (p = 0.02, HR 1.87 CI 1.25-2.8), and the maximal dose to the rectum is correlated to the development of late grade ≥2 GI toxicity (p = 0.03, HR 2.75 CI 1.10-6.9). CONCLUSIONS Conformal volumetric image-guided radiotherapy of the prostate bed leads to low toxicity rates.
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Who will benefit most from hydrogel rectum spacer implantation in prostate cancer radiotherapy? A model-based approach for patient selection. Radiother Oncol 2016; 121:118-123. [DOI: 10.1016/j.radonc.2016.08.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Revised: 08/05/2016] [Accepted: 08/29/2016] [Indexed: 12/11/2022]
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Ospina JD, Fargeas A, Dréan G, Simon A, Acosta O, de Crevoisier R. Recent advancements in toxicity prediction following prostate cancer radiotherapy. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2016; 2015:5231-4. [PMID: 26737471 DOI: 10.1109/embc.2015.7319571] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In external beam radiotherapy for prostate cancer limiting toxicities for dose escalation are bladder and rectum toxicities. Normal tissue complication probability models aim at quantifying the risk of developping adverse events following radiotherapy. These models, originally proposed in the context of uniform irradiation, have evolved to implementations based on the state-of-the-art classification methods which are trained using empirical data. Recently, the use of image processing techniques combined with population analysis methods has led to a new generation of models to understand the risk of normal tissue complications following radiotherapy. This paper overviews those methods in the case of prostate cancer radiation therapy and propose some lines of future research.
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Dose-surface maps identifying local dose-effects for acute gastrointestinal toxicity after radiotherapy for prostate cancer. Radiother Oncol 2015; 117:515-20. [PMID: 26522060 DOI: 10.1016/j.radonc.2015.10.020] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 10/05/2015] [Accepted: 10/20/2015] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND PURPOSE We evaluated dose distributions in the anorectum and its relation to acute gastrointestinal toxicities using dose surface maps in an image-guided (IG) IMRT and 3D-conformal radiotherapy (3D-CRT) population. MATERIAL AND METHODS For patients treated to 78 Gy with IG-IMRT (n=260) or 3D-CRT (n=215), for whom acute toxicity data were available, three types of surface maps were calculated: (1) total anorectum using regular intervals along a central axis with perpendicular slices, (2) the rectum next to the prostate, and (3) the anal canal (horizontal slicing). For each toxicity, an average dose map was calculated for patients with and without the toxicity and subsequently dose difference maps were constructed, 3D-CRT and IG-IMRT separately. P-values were based on permutation tests. RESULTS Dose distributions in patients with grade ⩾2 acute proctitis were significantly different from dose distributions in patients without toxicity, for IG-IMRT and 3D-CRT. At the cranial and posterior rectal site, in areas receiving moderate dose levels (≈25-50 Gy), dose differences up to 10 Gy were identified for IG-IMRT. For pain, cramps, incontinence, diarrhea and mucus loss significant differences were found as well. CONCLUSIONS We demonstrated significant relationships between acute rectal toxicity and local dose distributions. This may serve as a basis for subsequent dose-effect modeling in IG-IMRT, and improved dose constraints in current clinical practice.
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Vanneste BGL, Van De Voorde L, de Ridder RJ, Van Limbergen EJ, Lambin P, van Lin EN. Chronic radiation proctitis: tricks to prevent and treat. Int J Colorectal Dis 2015; 30:1293-303. [PMID: 26198994 PMCID: PMC4575375 DOI: 10.1007/s00384-015-2289-4] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/13/2015] [Indexed: 02/04/2023]
Abstract
OBJECTIVE The purpose of this study was to give an overview of the measures used to prevent chronic radiation proctitis (CRP) and to provide an algorithm for the treatment of CRP. METHODS Medical literature databases including PubMed and Medline were screened and critically analyzed for relevance in the scope of our purpose. RESULTS CRP is a relatively frequent late side effect (5-20%) and mainly dependent on the dose and volume of irradiated rectum. Radiation treatment (RT) techniques to prevent CRP are constantly improving thanks to image-guided RT and intensity-modulated RT. Also, newer techniques like protons and new devices such as rectum spacers and balloons have been developed to spare rectal structures. Biopsies do not contribute to diagnosing CRP and should be avoided because of the risk of severe rectal wall damage, such as necrosis and fistulas. There is no consensus on the optimal treatment of CRP. A variety of possibilities is available and includes topical and oral agents, hyperbaric oxygen therapy, and endoscopic interventions. CONCLUSIONS CRP has a natural history of improving over time, even without treatment. This is important to take into account when considering these treatments: first be conservative (topical and oral agents) and be aware that invasive treatments can be very toxic.
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Affiliation(s)
- Ben G L Vanneste
- Department of Radiation Oncology (MAASTRO Clinic), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 3035, 6202 NA, Maastricht, The Netherlands.
| | - Lien Van De Voorde
- Department of Radiation Oncology (MAASTRO Clinic), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 3035, 6202 NA, Maastricht, The Netherlands
| | - Rogier J de Ridder
- Department of Gastroenterology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Evert J Van Limbergen
- Department of Radiation Oncology (MAASTRO Clinic), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 3035, 6202 NA, Maastricht, The Netherlands
| | - Philippe Lambin
- Department of Radiation Oncology (MAASTRO Clinic), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 3035, 6202 NA, Maastricht, The Netherlands
| | - Emile N van Lin
- Department of Radiation Oncology (MAASTRO Clinic), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, P.O. Box 3035, 6202 NA, Maastricht, The Netherlands
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18
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Warner A, Pickles T, Crook J, Martin AG, Souhami L, Catton C, Lukka H, Rodrigues G. Development of ProCaRS Clinical Nomograms for Biochemical Failure-free Survival Following Either Low-Dose Rate Brachytherapy or Conventionally Fractionated External Beam Radiation Therapy for Localized Prostate Cancer. Cureus 2015; 7:e276. [PMID: 26180700 PMCID: PMC4494461 DOI: 10.7759/cureus.276] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 06/11/2015] [Indexed: 11/27/2022] Open
Abstract
Purpose: Although several clinical nomograms predictive of biochemical failure-free survival (BFFS) for localized prostate cancer exist in the medical literature, making valid comparisons can be challenging due to variable definitions of biochemical failure, the disparate distribution of prognostic factors, and received treatments in patient populations. The aim of this investigation was to develop and validate clinically-based nomograms for 5-year BFFS using the ASTRO II “Phoenix” definition for two patient cohorts receiving low-dose rate (LDR) brachytherapy or conventionally fractionated external beam radiation therapy (EBRT) from a large Canadian multi-institutional database. Methods and Materials: Patients were selected from the GUROC (Genitourinary Radiation Oncologists of Canada) Prostate Cancer Risk Stratification (ProCaRS) database if they received (1) LDR brachytherapy ≥ 144 Gy (n=4208) or (2) EBRT ≥ 70 Gy (n=822). Multivariable Cox regression analysis for BFFS was performed separately for each cohort and used to generate clinical nomograms predictive of 5-year BFFS. Nomograms were validated using calibration plots of nomogram predicted probability versus observed probability via Kaplan-Meier estimates. Results: Patients receiving LDR brachytherapy had a mean age of 64 ± 7 years, a mean baseline PSA of 6.3 ± 3.0 ng/mL, 75% had a Gleason 6, and 15% had a Gleason 7, whereas patients receiving EBRT had a mean age of 70 ± 6 years, a mean baseline PSA of 11.6 ± 10.7 ng/mL, 30% had a Gleason 6, 55% had a Gleason 7, and 14% had a Gleason 8-10. Nomograms for 5-year BFFS included age, use and duration of androgen deprivation therapy (ADT), baseline PSA, T stage, and Gleason score for LDR brachytherapy and an ADT (months), baseline PSA, Gleason score, and biological effective dose (Gy) for EBRT. Conclusions: Clinical nomograms examining 5-year BFFS were developed for patients receiving either LDR brachytherapy or conventionally fractionated EBRT and may assist clinicians in predicting an outcome. Future work should be directed at examining the role of additional prognostic factors, comorbidities, and toxicity in predicting survival outcomes.
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Affiliation(s)
- Andrew Warner
- Radiation Oncology, London Health Sciences Centre, London, Ontario, CA
| | - Tom Pickles
- Radiation Oncology, BC Cancer Agency, Vancouver Centre, University of British Columbia
| | | | - Andre-Guy Martin
- Radiation Oncology, Centre Hospitalier Universitaire de Québec - L'Hôtel-Dieu de Québec, Québec, QC
| | - Luis Souhami
- Department of Oncology, Division of Radiation Oncology, McGill University Health Center
| | - Charles Catton
- Radiation Oncology, University of Toronto and Universitry Health Network
| | - Himu Lukka
- Radiation Oncology, Juravinski Cancer Centre, Hamilton, ON
| | - George Rodrigues
- Department of Oncology, London Health Sciences Centre; Schulich School of Medicine & Dentistry, Western University, London, Ontario, CA
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Aluwini S, Pos F, Schimmel E, van Lin E, Krol S, van der Toorn PP, de Jager H, Dirkx M, Alemayehu WG, Heijmen B, Incrocci L. Hypofractionated versus conventionally fractionated radiotherapy for patients with prostate cancer (HYPRO): acute toxicity results from a randomised non-inferiority phase 3 trial. Lancet Oncol 2015; 16:274-83. [PMID: 25656287 DOI: 10.1016/s1470-2045(14)70482-6] [Citation(s) in RCA: 133] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND In 2007, we began the randomised phase 3 multicentre HYPRO trial to investigate the effect of hypofractionated radiotherapy compared with conventionally fractionated radiotherapy on relapse-free survival in patients with prostate cancer. Here, we examine whether patients experience differences in acute gastrointestinal and genitourinary adverse effects. METHODS In this randomised non-inferiority phase 3 trial, done in seven radiotherapy centres in the Netherlands, we enrolled intermediate-risk or high-risk patients aged between 44 and 85 years with histologically confirmed stage T1b-T4 NX-0MX-0 prostate cancer, a PSA concentration of 60 ng/mL or lower, and WHO performance status of 0-2. A web-based application was used to randomly assign (1:1) patients to receive either standard fractionation with 39 fractions of 2 Gy in 8 weeks (five fractions per week) or hypofractionation with 19 fractions of 3·4 Gy in 6·5 weeks (three fractions per week). Randomisation was done with minimisation procedure, stratified by treatment centre and risk group. The primary endpoint is 5-year relapse-free survival. Here we report data for the acute toxicity outcomes: the cumulative incidence of grade 2 or worse acute and late genitourinary and gastrointestinal toxicity. Non-inferiority of hypofractionation was tested separately for genitourinary and gastrointestinal acute toxic effects, with a null hypothesis that cumulative incidences of each type of adverse event were not more than 8% higher in the hypofractionation group than in the standard fractionation group. We scored acute genitourinary and gastrointestinal toxic effects according to RTOG-EORTC criteria from both case report forms and patients' self-assessment questionnaires, at baseline, twice during radiotherapy, and 3 months after completion of radiotherapy. Analyses were done in the intention-to-treat population. Patient recruitment has been completed. This study is registered with www.controlled-trials.com, number ISRCTN85138529. FINDINGS Between March 19, 2007, and Dec 3, 2010, 820 patients were randomly assigned to treatment with standard fractionation (n=410) or hypofractionation (n=410). 3 months after radiotherapy, 73 (22%) patients in the standard fractionation group and 75 (23%) patients in the hypofractionation group reported grade 2 or worse genitourinary toxicity; grade 2 or worse gastrointestinal toxicity was noted in 43 (13%) patients in the standard fractionation group and in 42 (13%) in the hypofractionation group. Grade 4 acute genitourinary toxicity was reported for two patients, one (<1%) in each group. No grade 4 acute gastrointestinal toxicities were observed. We noted no significant difference in cumulative incidence by 120 days after radiotherapy of grade 2 or worse acute genitourinary toxicity (57·8% [95% CI 52·9-62·7] in the standard fractionation group vs 60·5% (55·8-65·3) in the hypofractionation group; difference 2·7%, 90% CI -2·99 to 8·48; odds ratio [OR] 1·12, 95% CI 0·84-1·49; p=0·43). The cumulative incidence of grade 2 or worse acute gastrointestinal toxicity by 120 days after radiotherapy was higher in patients given hypofractionation (31·2% [95% CI 26·6-35·8] in the standard fractionation group vs 42·0% [37·2-46·9] in the hypofractionation group; difference 10·8%, 90% CI 5·25-16·43; OR 1·6; p=0·0015; non-inferiority not confirmed). INTERPRETATION Hypofractionated radiotherapy was not non-inferior to standard fractionated radiotherapy in terms of acute genitourinary and gastrointestinal toxicity for men with intermediate-risk and high-risk prostate cancer. In fact, the cumulative incidence of grade 2 or worse acute gastrointestinal toxicity was significantly higher in patients given hypofractionation than in those given standard fractionated radiotherapy. Patients remain in follow-up for efficacy endpoints. FUNDING The Dutch Cancer Society.
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Affiliation(s)
- Shafak Aluwini
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, Netherlands.
| | - Floris Pos
- Department of Radiation Oncology, Netherlands Cancer Institute-Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - Erik Schimmel
- Institute for Radiation Oncology Arnhem, Netherlands
| | - Emile van Lin
- Department of Radiation Oncology, University Medical Centre Nijmegen, Nijmegen, Netherlands
| | - Stijn Krol
- Department of Radiation Oncology, Leiden University Medical Centre, Leiden, Netherlands
| | | | | | - Maarten Dirkx
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, Netherlands
| | | | - Ben Heijmen
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, Netherlands
| | - Luca Incrocci
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, Netherlands
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20
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Fonteyne V, Ost P, Vanpachtenbeke F, Colman R, Sadeghi S, Villeirs G, Decaestecker K, De Meerleer G. Rectal toxicity after intensity modulated radiotherapy for prostate cancer: which rectal dose volume constraints should we use? Radiother Oncol 2014; 113:398-403. [PMID: 25441610 DOI: 10.1016/j.radonc.2014.10.014] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 10/19/2014] [Accepted: 10/31/2014] [Indexed: 12/25/2022]
Abstract
BACKGROUND To define rectal dose volume constraints (DVC) to prevent ⩾grade2 late rectal toxicity (LRT) after intensity modulated radiotherapy (IMRT) for prostate cancer (PC). MATERIAL AND METHODS Six hundred thirty-seven PC patients were treated with primary (prostate median dose: 78Gy) or postoperative (prostatic bed median dose: 74Gy (adjuvant)-76Gy (salvage)) IMRTwhile restricting the rectal dose to 76Gy, 72Gy and 74Gy respectively. The impact of patient characteristics and rectal volume parameters on ⩾grade2 LRT was determined. DVC were defined to estimate the 5% and 10% risk of developing ⩾grade2 LRT. RESULTS The 5-year probability of being free from ⩾grade2 LRT, non-rectal blood loss and persisting symptoms is 88.8% (95% CI: 85.8-91.1%), 93.4% (95% CI: 91.0-95.1%) and 94.3% (95% CI: 92.0-95.9%) respectively. There was no correlation with patient characteristics. All volume parameters, except rectal volume receiving ⩾70Gy (R70), were significantly correlated with ⩾grade2 LRT. To avoid 10% and 5% risk of ⩾grade2 LRT following DVC were derived: R40, R50, R60 and R65 <64-35%, 52-22%, 38-14% and 5% respectively. CONCLUSION Applying existing rectal volume constraints resulted in a 5-year estimated risk of developing late ⩾grade2 LRT of 11.2%. New rectal DVC for primary and postoperative IMRT planning of PC patients are proposed. A prospective evaluation is needed.
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Affiliation(s)
- Valérie Fonteyne
- Ghent University Hospital, Department of Radiation Oncology and Experimental Cancer Research, Belgium.
| | - Piet Ost
- Ghent University Hospital, Department of Radiation Oncology and Experimental Cancer Research, Belgium
| | - Frank Vanpachtenbeke
- Ghent University Hospital, Department of Radiation Oncology and Experimental Cancer Research, Belgium
| | - Roos Colman
- Ghent University, Biostatistics Unit, Department of Public Health, Faculty of Medicine and Health Sciences, Belgium
| | - Simin Sadeghi
- Ghent University Hospital, Department of Radiation Oncology and Experimental Cancer Research, Belgium
| | - Geert Villeirs
- Ghent University Hospital, Department of Radiology, Belgium
| | | | - Gert De Meerleer
- Ghent University Hospital, Department of Radiation Oncology and Experimental Cancer Research, Belgium
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Transformation of physical DVHs to radiobiologically equivalent ones in hypofractionated radiotherapy analyzing dosimetric and clinical parameters: a practical approach for routine clinical practice in radiation oncology. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2013; 2013:713420. [PMID: 24348743 PMCID: PMC3852578 DOI: 10.1155/2013/713420] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 08/18/2013] [Accepted: 09/26/2013] [Indexed: 11/17/2022]
Abstract
Purpose. The purpose of this study was to transform DVHs from physical to radiobiological ones as well as to evaluate their reliability by correlations of dosimetric and clinical parameters for 50 patients with prostate cancer and 50 patients with breast cancer, who were submitted to Hypofractionated Radiotherapy. Methods and Materials. To achieve this transformation, we used both the linear-quadratic model (LQ model) and the Niemierko model. The outcome of radiobiological DVHs was correlated with acute toxicity score according to EORTC/RTOG criteria. Results. Concerning the prostate radiotherapy, there was a significant correlation between RTOG acute rectal toxicity and D50 (P < 0.001) and V60 (P = 0.001) dosimetric parameters, calculated for α/β = 10 Gy. Moreover, concerning the breast radiotherapy there was a significant correlation between RTOG skin toxicity and V≥60 dosimetric parameter, calculated for both α/β = 2.3 Gy (P < 0.001) and α/β = 10 Gy (P < 0.001). The new tool seems reliable and user-friendly. Conclusions. Our proposed model seems user-friendly. Its reliability in terms of agreement with the presented acute radiation induced toxicity was satisfactory. However, more patients are needed to extract safe conclusions.
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22
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Brown LC, Atherton PJ, Neben-Wittich MA, Wender DB, Behrens RJ, Kozelsky TF, Loprinzi CL, Haddock MG, Martenson JA. Assessment of long-term rectal function in patients who received pelvic radiotherapy: a pooled North Central Cancer Treatment Group trial analysis, N09C1. Support Care Cancer 2013; 21:2869-77. [PMID: 23748483 PMCID: PMC3769434 DOI: 10.1007/s00520-013-1853-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Accepted: 05/16/2013] [Indexed: 12/25/2022]
Abstract
PURPOSE Pelvic radiotherapy (PRT) is known to adversely affect bowel function (BF) and patient well-being. This study characterized long-term BF and evaluated quality of life (QOL) in patients receiving PRT. METHODS Data from 252 patients were compiled from two North Central Cancer Treatment Group prospective studies, which included assessment of BF and QOL by the BF questionnaire (BFQ) and Uniscale QOL at baseline and 12 and 24 months after completion of radiotherapy. BFQ scores (sum of symptoms), Uniscale results, adverse-event incidence, and baseline demographic data were compared via t test, χ (2), Fisher exact, Wilcoxon, and correlation methodologies. RESULTS The total BFQ score was higher than baseline at 12 and 24 months (P < 0.001). More patients had five or more symptoms at 12 months (13 %) and 24 months (10 %) than at baseline (2 %). Symptoms occurring in greater than 20 % of patients at 12 and 24 months were clustering, stool-gas confusion, and urgency. Factors associated with worse BF were female sex, rectal or gynecologic primary tumors, prior anterior resection of the rectum, and 5-fluorouracil chemotherapy. Patients experiencing grade 2 or higher acute toxicity had worse 24-month BF (P values, <.001-.02). Uniscale QOL was not significantly different from baseline at 12 or 24 months, despite worse BFQ scores. CONCLUSIONS PRT was associated with worse long-term BF. Worse BFQ score was not associated with poorer QOL. Further research to characterize the subset of patients at risk of significant decline in BF is warranted.
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Affiliation(s)
- Lindsay C Brown
- Department of Radiation Oncology, Mayo Clinic, 200 First St SW, Rochester, MN, 55905, USA
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23
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Fuentes-Raspall R, Inoriza JM, Rosello-Serrano A, Auñón-Sanz C, Garcia-Martin P, Oliu-Isern G. Late rectal and bladder toxicity following radiation therapy for prostate cancer: Predictive factors and treatment results. Rep Pract Oncol Radiother 2013; 18:298-303. [PMID: 24416567 DOI: 10.1016/j.rpor.2013.05.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Revised: 04/25/2013] [Accepted: 05/25/2013] [Indexed: 12/15/2022] Open
Abstract
AIM This study aimed at investigating factors associated to late rectal and bladder toxicity following radiation therapy and the effectiveness of Hyperbaric Oxygen Therapy (HBOT) when toxicity is grade ≥2. BACKGROUND Radiation is frequently used for prostate cancer, but a 5-20% incidence of late radiation proctitis and cystitis exists. Some clinical and dosimetric factors have been defined without a full agreement. For patients diagnosed of late chronic proctitis and/or cystitis grade ≥2 treatment is not well defined. Hyperbaric Oxygen Therapy (HBOT) has been used, but its effectiveness is not well known. MATERIALS AND METHODS 257 patients were treated with radiation therapy for prostate cancer. Clinical, pharmacological and dosimetric parameters were collected. Patients having a grade ≥2 toxicity were treated with HBOT. Results of the intervention were measured by monitoring toxicity by Common Toxicity Criteria v3 (CTCv3). RESULTS Late rectal toxicity was related to the volume irradiated, i.e. V50 > 53.64 (p = 0.013); V60 > 38.59% (p = 0.005); V65 > 31.09% (p = 0.002) and V70 > 22.81% (p = 0.012). We could not correlate the volume for bladder. A total of 24 (9.3%) patients experienced a grade ≥2. Only the use of dicumarinic treatment was significant for late rectal toxicity (p = 0.014). A total of 14 patients needed HBOT. Final percentage of patients with a persistent toxicity grade ≥2 was 4.5%. CONCLUSION Rectal volume irradiated and dicumarinic treatment were associated to late rectal/bladder toxicity. When toxicity grade ≥2 is diagnosed, HBOT significantly ameliorate symptoms.
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Affiliation(s)
- Rafael Fuentes-Raspall
- Catalan Institute of Oncology. Hospital Universitari "Josep Trueta" Girona, Spain ; Institut de Recerca Biomèdica de Girona, IDIBGi, Spain
| | | | - Alvaro Rosello-Serrano
- Catalan Institute of Oncology. Hospital Universitari "Josep Trueta" Girona, Spain ; Institut de Recerca Biomèdica de Girona, IDIBGi, Spain
| | - Carmen Auñón-Sanz
- Catalan Institute of Oncology. Hospital Universitari "Josep Trueta" Girona, Spain ; Institut de Recerca Biomèdica de Girona, IDIBGi, Spain
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Valdagni R, Rancati T. Reducing rectal injury during external beam radiotherapy for prostate cancer. Nat Rev Urol 2013; 10:345-57. [PMID: 23670182 DOI: 10.1038/nrurol.2013.96] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Rectal bleeding and faecal incontinence are serious injuries that men with prostate cancer who receive radiotherapy can experience. Although technical advances--including the use of intensity-modulated radiotherapy coupled with image-guided radiotherapy--have enabled the delivery of dose distributions that conform to the shape of the tumour target with steep dose gradients that reduce the dose given to surrounding tissues, radiotherapy-associated toxicity can not be avoided completely. Many large-scale prospective studies have analysed the correlations of patient-related and treatment-related parameters with acute and late toxicity to optimize patient selection and treatment planning. The careful application of dose-volume constraints and the tuning of these constraints to the individual patient's characteristics are now considered the most effective ways of reducing rectal morbidity. Additionally, the use of endorectal balloons (to reduce the margins between the clinical target volume and planning target volume) and the insertion of tissue spacers into the region between the prostate and anterior rectal wall have been investigated as means to further reduce late rectal injury. Finally, some drugs and other compounds are also being considered to help protect healthy tissue. Overall, a number of approaches exist that must be fully explored in large prospective trials to address the important issue of rectal toxicity in prostate cancer radiotherapy.
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Affiliation(s)
- Riccardo Valdagni
- Department of Radiation Oncology 1, Fondazione IRCCS Istituto Nazionale dei Tumori, Via Venezian 1, Milan 20133, Italy
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25
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Gray PJ, Paly JJ, Yeap BY, Sanda MG, Sandler HM, Michalski JM, Talcott JA, Coen JJ, Hamstra DA, Shipley WU, Hahn SM, Zietman AL, Bekelman JE, Efstathiou JA. Patient-reported outcomes after 3-dimensional conformal, intensity-modulated, or proton beam radiotherapy for localized prostate cancer. Cancer 2013; 119:1729-35. [PMID: 23436283 PMCID: PMC3759976 DOI: 10.1002/cncr.27956] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 12/08/2012] [Accepted: 12/11/2012] [Indexed: 12/25/2022]
Abstract
BACKGROUND Recent studies have suggested differing toxicity patterns for patients with prostate cancer who receive treatment with 3-dimensional conformal radiotherapy (3DCRT), intensity-modulated radiotherapy (IMRT), or proton beam therapy (PBT). METHODS The authors reviewed patient-reported outcomes data collected prospectively using validated instruments that assessed bowel and urinary quality of life (QOL) for patients with localized prostate cancer who received 3DCRT (n = 123), IMRT (n = 153) or PBT (n = 95). Clinically meaningful differences in mean QOL scores were defined as those exceeding half the standard deviation of the baseline mean value. Changes from baseline were compared within groups at the first post-treatment follow-up (2-3 months from the start of treatment) and at 12 months and 24 months. RESULTS At the first post-treatment follow-up, patients who received 3DCRT and IMRT, but not those who received PBT, reported a clinically meaningful decrement in bowel QOL. At 12 months and 24 months, all 3 cohorts reported clinically meaningful decrements in bowel QOL. Patients who received IMRT reported clinically meaningful decrements in the domains of urinary irritation/obstruction and incontinence at the first post-treatment follow-up. At 12 months, patients who received PBT, but not those who received IMRT or 3DCRT, reported a clinically meaningful decrement in the urinary irritation/obstruction domain. At 24 months, none of the 3 cohorts reported clinically meaningful changes in urinary QOL. CONCLUSIONS Patients who received 3DCRT, IMRT, or PBT reported distinct patterns of treatment-related QOL. Although the timing of toxicity varied between the cohorts, patients reported similar modest QOL decrements in the bowel domain and minimal QOL decrements in the urinary domains at 24 months. Prospective randomized trials are needed to further examine these differences.
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Affiliation(s)
| | - Jonathan J. Paly
- Department of Radiation Oncology, Massachusetts General Hospital, Boston, Massachusetts
| | - Beow Y. Yeap
- Department of Radiation Oncology, Massachusetts General Hospital, Boston, Massachusetts
| | - Martin G. Sanda
- Division of Urologic Surgery, Beth Israel Deaconess Medical Center, Boston, Massachusetts
| | - Howard. M. Sandler
- Department of Radiation Oncology, Cedars-Sinai Medical Center, Los Angeles, California
| | - Jeff M. Michalski
- Department of Radiation Oncology, Washington University School of Medicine, St. Louis, Missouri
| | | | - John J. Coen
- Hartford Radiation Oncology Associates, Hartford, Connecticut
| | - Daniel A. Hamstra
- Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor, Michigan
| | - William U. Shipley
- Department of Radiation Oncology, Massachusetts General Hospital, Boston, Massachusetts
| | - Stephen M. Hahn
- Department of Radiation Oncology, Abramson Cancer Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Anthony L. Zietman
- Department of Radiation Oncology, Massachusetts General Hospital, Boston, Massachusetts
| | - Justin E. Bekelman
- Department of Radiation Oncology, Abramson Cancer Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Jason A. Efstathiou
- Department of Radiation Oncology, Massachusetts General Hospital, Boston, Massachusetts
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Abstract
Predictive modeling is emerging as an important knowledge-based technology in healthcare. The interest in the use of predictive modeling reflects advances on different fronts such as the availability of health information from increasingly complex databases and electronic health records, a better understanding of causal or statistical predictors of health, disease processes and multifactorial models of ill-health and developments in nonlinear computer models using artificial intelligence or neural networks. These new computer-based forms of modeling are increasingly able to establish technical credibility in clinical contexts. The current state of knowledge is still quite young in understanding the likely future direction of how this so-called ‘machine intelligence’ will evolve and therefore how current relatively sophisticated predictive models will evolve in response to improvements in technology, which is advancing along a wide front. Predictive models in urology are gaining progressive popularity not only for academic and scientific purposes but also into the clinical practice with the introduction of several nomograms dealing with the main fields of onco-urology.
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Tucker SL, Michalski JM, Bosch WR, Mohan R, Dong L, Winter K, Purdy JA, Cox JD. Use of fractional dose-volume histograms to model risk of acute rectal toxicity among patients treated on RTOG 94-06. Radiother Oncol 2012; 104:109-13. [PMID: 22673726 DOI: 10.1016/j.radonc.2012.04.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Revised: 03/20/2012] [Accepted: 04/23/2012] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND PURPOSE For toxicities occurring during the course of radiotherapy, it is conceptually inaccurate to perform normal-tissue complication probability analyses using the complete dose-volume histogram. The goal of this study was to analyze acute rectal toxicity using a novel approach in which the fit of the Lyman-Kutcher-Burman (LKB) model is based on the fractional rectal dose-volume histogram (DVH). MATERIALS AND METHODS Grade ≥2 acute rectal toxicity was analyzed in 509 patients treated on Radiation Therapy Oncology Group (RTOG) protocol 94-06. These patients had no field reductions or treatment-plan revisions during therapy, allowing the fractional rectal DVH to be estimated from the complete rectal DVH based on the total number of dose fractions delivered. RESULTS The majority of patients experiencing Grade ≥2 acute rectal toxicity did so before completion of radiotherapy (70/80=88%). Acute rectal toxicity depends on fractional mean rectal dose, with no significant improvement in the LKB model fit when the volume parameter differs from n=1. The incidence of toxicity was significantly lower for patients who received hormone therapy (P=0.024). CONCLUSIONS Variations in fractional mean dose explain the differences in incidence of acute rectal toxicity, with no detectable effect seen here for differences in numbers of dose fractions delivered.
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Affiliation(s)
- Susan L Tucker
- Department of Bioinformatics and Computational Biology – Unit 1410, The University of Texas MD Anderson Cancer Center, P.O. Box 301402, Houston, TX 77230, USA.
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Fiorino C, Rancati T, Fellin G, Vavassori V, Cagna E, Casanova Borca V, Girelli G, Menegotti L, Monti AF, Tortoreto F, Delle Canne S, Valdagni R. Late Fecal Incontinence After High-Dose Radiotherapy for Prostate Cancer: Better Prediction Using Longitudinal Definitions. Int J Radiat Oncol Biol Phys 2012; 83:38-45. [DOI: 10.1016/j.ijrobp.2011.06.1953] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Revised: 06/01/2011] [Accepted: 06/03/2011] [Indexed: 10/16/2022]
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Valdagni R, Vavassori V, Rancati T, Fellin G, Baccolini M, Bianchi C, Cagna E, Gabriele P, Mauro F, Menegotti L, Monti AF, Stasi M, Fiorino C. Increasing the risk of late rectal bleeding after high-dose radiotherapy for prostate cancer: The case of previous abdominal surgery. Results from a prospective trial. Radiother Oncol 2012; 103:252-5. [DOI: 10.1016/j.radonc.2012.03.012] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2010] [Revised: 03/23/2012] [Accepted: 03/26/2012] [Indexed: 11/25/2022]
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Sheets NC, Goldin GH, Meyer AM, Wu Y, Chang Y, Stürmer T, Holmes JA, Reeve BB, Godley PA, Carpenter WR, Chen RC. Intensity-modulated radiation therapy, proton therapy, or conformal radiation therapy and morbidity and disease control in localized prostate cancer. JAMA 2012; 307:1611-20. [PMID: 22511689 PMCID: PMC3702170 DOI: 10.1001/jama.2012.460] [Citation(s) in RCA: 340] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
CONTEXT There has been rapid adoption of newer radiation treatments such as intensity-modulated radiation therapy (IMRT) and proton therapy despite greater cost and limited demonstrated benefit compared with previous technologies. OBJECTIVE To determine the comparative morbidity and disease control of IMRT, proton therapy, and conformal radiation therapy for primary prostate cancer treatment. DESIGN, SETTING, AND PATIENTS Population-based study using Surveillance, Epidemiology, and End Results-Medicare-linked data from 2000 through 2009 for patients with nonmetastatic prostate cancer. MAIN OUTCOME MEASURES Rates of gastrointestinal and urinary morbidity, erectile dysfunction, hip fractures, and additional cancer therapy. RESULTS Use of IMRT vs conformal radiation therapy increased from 0.15% in 2000 to 95.9% in 2008. In propensity score-adjusted analyses (N = 12,976), men who received IMRT vs conformal radiation therapy were less likely to receive a diagnosis of gastrointestinal morbidities (absolute risk, 13.4 vs 14.7 per 100 person-years; relative risk [RR], 0.91; 95% CI, 0.86-0.96) and hip fractures (absolute risk, 0.8 vs 1.0 per 100 person-years; RR, 0.78; 95% CI, 0.65-0.93) but more likely to receive a diagnosis of erectile dysfunction (absolute risk, 5.9 vs 5.3 per 100 person-years; RR, 1.12; 95% CI, 1.03-1.20). Intensity-modulated radiation therapy patients were less likely to receive additional cancer therapy (absolute risk, 2.5 vs 3.1 per 100 person-years; RR, 0.81; 95% CI, 0.73-0.89). In a propensity score-matched comparison between IMRT and proton therapy (n = 1368), IMRT patients had a lower rate of gastrointestinal morbidity (absolute risk, 12.2 vs 17.8 per 100 person-years; RR, 0.66; 95% CI, 0.55-0.79). There were no significant differences in rates of other morbidities or additional therapies between IMRT and proton therapy. CONCLUSIONS Among patients with nonmetastatic prostate cancer, the use of IMRT compared with conformal radiation therapy was associated with less gastrointestinal morbidity and fewer hip fractures but more erectile dysfunction; IMRT compared with proton therapy was associated with less gastrointestinal morbidity.
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Affiliation(s)
- Nathan C Sheets
- Department of Radiation Oncology, University of North Carolina at Chapel Hill, NC, USA
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Magnani T, Valdagni R, Salvioni R, Villa S, Bellardita L, Donegani S, Nicolai N, Procopio G, Bedini N, Rancati T, Zaffaroni N. The 6-year attendance of a multidisciplinary prostate cancer clinic in Italy: incidence of management changes. BJU Int 2012; 110:998-1003. [DOI: 10.1111/j.1464-410x.2012.10970.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Dias RS, Giordani AJ, Souhami L, Segreto RA, Segreto HRC. Rectal planning risk volume correlation with acute and late toxicity in 3-dimensional conformal radiation therapy for prostate cancer. Technol Cancer Res Treat 2012; 10:585-90. [PMID: 22066598 DOI: 10.1177/153303461101000608] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The purpose of this study was to evaluate rectum motion during 3-Dimensional conformal radiation therapy (3D-CRT) in prostate cancer patients, to derive a planning volume at risk (PRV) and to correlate the PRV dose-volume histograms (DVH) with treatment complications.This study was conducted in two phases. Initially, the PRV was defined prospectively in 50 consecutive prostate cancer patients (Group 1) who received a radical course of 3-D CRT. Then, the obtained PRV was used in the radiotherapy planning of these same 50 patients plus another 59 prostate cancer patients (Group 2) previously treated between 2004 and 2008. All these patients' data, including the rectum and PRV DVHs, were correlated to acute and late complications, according to the Common Toxicity Criteria (CTC) v4.0.The largest displacement occurred in the anterior axis. Long-term gastrointestinal (GI) complications grade ≥ 2 were seen in 9.2% of the cases. Factors that influenced acute GI reactions were: doses at 25% (p 5 0.011) and 40% (p 5 0.005) of the rectum volume and at 40% of the PRV (p 5 0.012). The dose at 25% of the rectum volume (p 5 0.033) and acute complications ≥ grade 2 (p 5 0.018) were prognostic factors for long-term complications. The PRV DVH did not correlate with late toxicity. The rectum showed a significant inter-fraction motion during 3D-CRT for prostate cancer. PRV dose correlated with acute gastrointestinal complications and may be a useful tool to predict and reduce their occurrence.
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Affiliation(s)
- R S Dias
- Department of Clinical and Experimental Oncology, Division of Radiation Oncology, Universidade Federal de Sao Paulo, Rua Napoleao de Barros 715, Sao Paulo, SP, Brazil
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Tomatis S, Rancati T, Fiorino C, Vavassori V, Fellin G, Cagna E, Mauro FA, Girelli G, Monti A, Baccolini M, Naldi G, Bianchi C, Menegotti L, Pasquino M, Stasi M, Valdagni R. Late rectal bleeding after 3D-CRT for prostate cancer: development of a neural-network-based predictive model. Phys Med Biol 2012; 57:1399-412. [PMID: 22349550 DOI: 10.1088/0031-9155/57/5/1399] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The aim of this study was to develop a model exploiting artificial neural networks (ANNs) to correlate dosimetric and clinical variables with late rectal bleeding in prostate cancer patients undergoing radical radiotherapy and to compare the ANN results with those of a standard logistic regression (LR) analysis. 718 men included in the AIROPROS 0102 trial were analyzed. This multicenter protocol was characterized by the prospective evaluation of rectal toxicity, with a minimum follow-up of 36 months. Radiotherapy doses were between 70 and 80 Gy. Information was recorded for comorbidity, previous abdominal surgery, use of drugs and hormonal therapy. For each patient, a rectal dose-volume histogram (DVH) of the whole treatment was recorded and the equivalent uniform dose (EUD) evaluated as an effective descriptor of the whole DVH. Late rectal bleeding of grade ≥ 2 was considered to define positive events in this study (52 of 718 patients). The overall population was split into training and verification sets, both of which were involved in model instruction, and a test set, used to evaluate the predictive power of the model with independent data. Fourfold cross-validation was also used to provide realistic results for the full dataset. The LR was performed on the same data. Five variables were selected to predict late rectal bleeding: EUD, abdominal surgery, presence of hemorrhoids, use of anticoagulants and androgen deprivation. Following a receiver operating characteristic analysis of the independent test set, the areas under the curves (AUCs) were 0.704 and 0.655 for ANN and LR, respectively. When evaluated with cross-validation, the AUC was 0.714 for ANN and 0.636 for LR, which differed at a significance level of p = 0.03. When a practical discrimination threshold was selected, ANN could classify data with sensitivity and specificity both equal to 68.0%, whereas these values were 61.5% for LR. These data provide reasonable evidence that results obtained with ANNs are superior to those achieved with LR when predicting late radiotherapy-related rectal bleeding. The future introduction of patient-related personal characteristics, such as gene expression profiles, might improve the predictive power of statistical classifiers. More refined morphological aspects of the dose distribution, such as dose surface mapping, might also enhance the overall performance of ANN-based predictive models.
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Affiliation(s)
- S Tomatis
- Department of Medical Physics, Fondazione IRCCS Istituto Nazionale Tumori, via Venezian 1, 20133 Milano, Italy.
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Smeenk RJ, Hoffmann AL, Hopman WPM, van Lin ENJT, Kaanders JHAM. Dose-effect relationships for individual pelvic floor muscles and anorectal complaints after prostate radiotherapy. Int J Radiat Oncol Biol Phys 2011; 83:636-44. [PMID: 22137024 DOI: 10.1016/j.ijrobp.2011.08.007] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Revised: 06/28/2011] [Accepted: 08/08/2011] [Indexed: 10/14/2022]
Abstract
PURPOSE To delineate the individual pelvic floor muscles considered to be involved in anorectal toxicity and to investigate dose-effect relationships for fecal incontinence-related complaints after prostate radiotherapy (RT). METHODS AND MATERIALS In 48 patients treated for localized prostate cancer, the internal anal sphincter (IAS) muscle, the external anal sphincter (EAS) muscle, the puborectalis muscle (PRM), and the levator ani muscles (LAM) in addition to the anal wall (Awall) and rectal wall (Rwall) were retrospectively delineated on planning computed tomography scans. Dose parameters were obtained and compared between patients with and without fecal urgency, incontinence, and frequency. Dose-effect curves were constructed. Finally, the effect of an endorectal balloon, which was applied in 28 patients, was investigated. RESULTS The total volume of the pelvic floor muscles together was about three times that of the Awall. The PRM was exposed to the highest RT dose, whereas the EAS received the lowest dose. Several anal and rectal dose parameters, as well as doses to all separate pelvic floor muscles, were associated with urgency, while incontinence was associated mainly with doses to the EAS and PRM. Based on the dose-effect curves, the following constraints regarding mean doses could be deduced to reduce the risk of urgency: ≤ 30 Gy to the IAS; ≤ 10 Gy to the EAS; ≤ 50 Gy to the PRM; and ≤ 40 Gy to the LAM. No dose-effect relationships for frequency were observed. Patients treated with an endorectal balloon reported significantly less urgency and incontinence, while their treatment plans showed significantly lower doses to the Awall, Rwall, and all pelvic floor muscles. CONCLUSIONS Incontinence-related complaints show specific dose-effect relationships to individual pelvic floor muscles. Dose constraints for each muscle can be identified for RT planning. When only the Awall is delineated, substantial components of the continence apparatus are excluded.
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Affiliation(s)
- Robert Jan Smeenk
- Department of Radiation Oncology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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Pella A, Cambria R, Riboldi M, Jereczek-Fossa BA, Fodor C, Zerini D, Torshabi AE, Cattani F, Garibaldi C, Pedroli G, Baroni G, Orecchia R. Use of machine learning methods for prediction of acute toxicity in organs at risk following prostate radiotherapy. Med Phys 2011; 38:2859-67. [PMID: 21815361 DOI: 10.1118/1.3582947] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE The goal of this study is to investigate the advantages of large scale optimization methods vs conventional classification techniques in predicting acute toxicity for urinary bladder and rectum due to prostate irradiation. METHODS Clinical and dosimetric data of 321 patients undergoing prostate conformal radiotherapy were recorded. Gastro-intestinal and genito-urinary acute toxicities were scored according to the Radiation Therapy Oncology Group/European Organization for Research and Treatment of Cancer (RTOG/EORTC) scale. Patients were classified in two categories to separate mild (Grade < 2) from severe toxicity levels (Grade > 2). Machine learning methods at different complexity were implemented to predict toxicity as a function of multiple variables. The first approach consisted of a large scale optimization method, based on genetic algorithms (GAs) and artificial neural networks (ANN). The second approach was a binary classifier based on support vector machines (SVM). RESULTS The ANN and SVM-based solutions showed comparable prediction accuracy, exhibiting an area under the receiver operating characteristic (ROC) curve of 0.7. Different sensitivity and specificity features were measured for the two approaches. The ANN algorithm showed enhanced sensitivity if combined with appropriate classification criteria. CONCLUSIONS The results demonstrate that high sensitivity in toxicity prediction can be achieved with optimized ANNs, that are put forward to represent a valuable support in medical decisions. Future studies will be focused on enlarging the available patient database to increase the reliability of toxicity prediction algorithms and to define optimal classification criteria.
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Affiliation(s)
- Andrea Pella
- TBMLab, Department of Bioengineering, Politecnico di Milano University, 20133 Milano, Italy.
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Is it time to tailor the prediction of radio-induced toxicity in prostate cancer patients? Building the first set of nomograms for late rectal syndrome. Int J Radiat Oncol Biol Phys 2011; 82:1957-66. [PMID: 21640511 DOI: 10.1016/j.ijrobp.2011.03.028] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Revised: 02/21/2011] [Accepted: 03/24/2011] [Indexed: 12/26/2022]
Abstract
PURPOSE Development of user-friendly tools for the prediction of single-patient probability of late rectal toxicity after conformal radiotherapy for prostate cancer. METHODS AND MATERIALS This multicenter protocol was characterized by the prospective evaluation of rectal toxicity through self-assessed questionnaires (minimum follow-up, 36 months) by 718 adult men in the AIROPROS 0102 trial. Doses were between 70 and 80 Gy. Nomograms were created based on multivariable logistic regression analysis. Three endpoints were considered: G2 to G3 late rectal bleeding (52/718 events), G3 late rectal bleeding (24/718 events), and G2 to G3 late fecal incontinence (LINC, 19/718 events). RESULTS Inputs for the nomogram for G2 to G3 late rectal bleeding estimation were as follows: presence of abdominal surgery before RT, percentage volume of rectum receiving >75 Gy (V75Gy), and nomogram-based estimation of the probability of G2 to G3 acute gastrointestinal toxicity (continuous variable, which was estimated using a previously published nomogram). G3 late rectal bleeding estimation was based on abdominal surgery before RT, V75Gy, and NOMACU. Prediction of G2 to G3 late fecal incontinence was based on abdominal surgery before RT, presence of hemorrhoids, use of antihypertensive medications (protective factor), and percentage volume of rectum receiving >40 Gy. CONCLUSIONS We developed and internally validated the first set of nomograms available in the literature for the prediction of radio-induced toxicity in prostate cancer patients. Calculations included dosimetric as well as clinical variables to help radiation oncologists predict late rectal morbidity, thus introducing the possibility of RT plan corrections to better tailor treatment to the patient's characteristics, to avoid unnecessary worsening of quality of life, and to provide support to the patient in selecting the best therapeutic approach.
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Longitudinal Study of Intestinal Symptoms and Fecal Continence in Patients With Conformal Radiotherapy for Prostate Cancer. Int J Radiat Oncol Biol Phys 2011; 79:1373-80. [DOI: 10.1016/j.ijrobp.2010.01.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2009] [Revised: 11/17/2009] [Accepted: 01/09/2010] [Indexed: 11/22/2022]
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Ferrandis C, March J, Martínez J, Hernández J, Diez N, Morillo V, García F, Chuan P. [Combined external radiotherapy and hormone therapy in patients with locally advanced prostate cancer: predictive factors of genitourinary toxicity]. Actas Urol Esp 2011; 35:146-51. [PMID: 21334103 DOI: 10.1016/j.acuro.2010.08.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2010] [Revised: 08/14/2010] [Accepted: 08/31/2010] [Indexed: 10/26/2022]
Abstract
INTRODUCTION Radiotherapy and androgen deprivation are an established treatment option for locally advanced prostate cancer. We evaluate outcomes in efficacy and toxicity for patients treated with this combined therapy at our institution. METHODS A retrospective study of 80 patients with locally advanced prostate cancer treated with radiotherapy combined with neo-adjuvant (2 months) and adjuvant (24 months) androgen deprivation. We studied the clinical variables and side effects. We evaluated treatment outcomes using PSA nadir and biochemical failure, and recorded acute and late gastrointestinal and urinary toxicity. We assessed the correlation between clinical variables and urinary toxicity by means of univariate and multivariate analyses (multiple logistic regression). RESULTS The mean patient age was 68 ± 5.81 years; the initial PSA was 20.05 ± 16.27 ng/ ml and the mean prostate volume 43.7 ± 27.57 cc. The clinical stage was T3a in 33% and T3b in 66%. The Gleason score was <7 in 39%, 7 in 46% and ≥8 in 15%. The mean follow-up was 44.4 months and biochemical failure was observed in 3 cases. Acute urinary toxicity was recorded in 90% of the patients (chronic in 35%) and acute gastrointestinal toxicity in 75% (late in 32%). In a univariate analysis, prostate volume and urinary symptoms were statistically correlated to acute and late urinary toxicity. Both prostate volume and urinary symptoms were independently associated with an increase in urinary toxicity in the logistic regression analysis. CONCLUSIONS Hormone-radiotherapy is a valid option to locally treat advanced prostate cancer with optimal short-term outcomes, although it is not devoid of side effects. Prostate volume and urinary symptoms before treatment can predict genitourinary toxicity.
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Wilder RB, Barme GA, Gilbert RF, Holevas RE, Kobashi LI, Reed RR, Solomon RS, Walter NL, Chittenden L, Mesa AV, Agustin JK, Lizarde J, Macedo JC, Ravera J, Tokita KM. Cross-linked hyaluronan gel improves the quality of life of prostate cancer patients undergoing radiotherapy. Brachytherapy 2011; 10:44-50. [DOI: 10.1016/j.brachy.2009.12.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2009] [Revised: 11/06/2009] [Accepted: 12/31/2009] [Indexed: 11/24/2022]
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Lambin P, Petit SF, Aerts HJWL, van Elmpt WJC, Oberije CJG, Starmans MHW, van Stiphout RGPM, van Dongen GAMS, Muylle K, Flamen P, Dekker ALAJ, De Ruysscher D. The ESTRO Breur Lecture 2009. From population to voxel-based radiotherapy: exploiting intra-tumour and intra-organ heterogeneity for advanced treatment of non-small cell lung cancer. Radiother Oncol 2010; 96:145-52. [PMID: 20647155 DOI: 10.1016/j.radonc.2010.07.001] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2010] [Revised: 07/07/2010] [Accepted: 07/07/2010] [Indexed: 01/22/2023]
Abstract
Evidence is accumulating that radiotherapy of non-small cell lung cancer patients can be optimized by escalating the tumour dose until the normal tissue tolerances are met. To further improve the therapeutic ratio between tumour control probability and the risk of normal tissue complications, we firstly need to exploit inter patient variation. This variation arises, e.g. from differences in tumour shape and size, lung function and genetic factors. Secondly improvement is achieved by taking into account intra-tumour and intra-organ heterogeneity derived from molecular and functional imaging. Additional radiation dose must be delivered to those parts of the tumour that need it the most, e.g. because of increased radio-resistance or reduced therapeutic drug uptake, and away from regions inside the lung that are most prone to complication. As the delivery of these treatments plans is very sensitive for geometrical uncertainties, probabilistic treatment planning is needed to generate robust treatment plans. The administration of these complicated dose distributions requires a quality assurance procedure that can evaluate the treatment delivery and, if necessary, adapt the treatment plan during radiotherapy.
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Affiliation(s)
- Philippe Lambin
- Department of Radiation Oncology (MAASTRO), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Centre, The Netherlands.
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Wilder RB, Barme GA, Gilbert RF, Holevas RE, Kobashi LI, Reed RR, Solomon RS, Walter NL, Chittenden L, Mesa AV, Agustin J, Lizarde J, Macedo J, Ravera J, Tokita KM. Cross-linked hyaluronan gel reduces the acute rectal toxicity of radiotherapy for prostate cancer. Int J Radiat Oncol Biol Phys 2010; 77:824-30. [PMID: 20510195 DOI: 10.1016/j.ijrobp.2009.05.069] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2009] [Revised: 05/28/2009] [Accepted: 05/29/2009] [Indexed: 12/11/2022]
Abstract
PURPOSE To prospectively analyze whether cross-linked hyaluronan gel reduces the mean rectal dose and acute rectal toxicity of radiotherapy for prostate cancer. METHODS AND MATERIALS Between September 2008 and March 2009, we transperitoneally injected 9 mL of cross-linked hyaluronan gel (Hylaform; Genzyme Corporation, Cambridge, MA) into the anterior perirectal fat of 10 early-stage prostate cancer patients to increase the separation between the prostate and rectum by 8 to 18 mm at the start of radiotherapy. Patients then underwent high-dose rate brachytherapy to 2,200 cGy followed by intensity-modulated radiation therapy to 5,040 cGy. We assessed acute rectal toxicity using the National Cancer Institute Common Terminology Criteria for Adverse Events v3.0 grading scheme. RESULTS Median follow-up was 3 months. The anteroposterior dimensions of Hylaform at the start and end of radiotherapy were 13 +/- 3mm (mean +/- SD) and 10 +/- 4mm, respectively. At the start of intensity-modulated radiation therapy, daily mean rectal doses were 73 +/- 13 cGy with Hylaform vs. 106 +/- 20 cGy without Hylaform (p = 0.005). There was a 0% incidence of National Cancer Institute Common Terminology Criteria for Adverse Events v3.0 Grade 1, 2, or 3 acute diarrhea in 10 patients who received Hylaform vs. a 29.7% incidence (n = 71) in 239 historical controls who did not receive Hylaform (p = 0.04). CONCLUSIONS By increasing the separation between the prostate and rectum, Hylaform decreased the mean rectal dose. This led to a significant reduction in the acute rectal toxicity of radiotherapy for prostate cancer.
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Maeda Y, Høyer M, Lundby L, Buntzen S, Laurberg S. Temporary sacral nerve stimulation for faecal incontinence following pelvic radiotherapy. Radiother Oncol 2010; 98:145-53. [PMID: 20570003 DOI: 10.1016/j.radonc.2010.12.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Revised: 12/06/2010] [Accepted: 12/08/2010] [Indexed: 12/29/2022]
Abstract
Temporary sacral nerve stimulation for faecal incontinence caused by pelvic radiation injuries was successful in 7 of 13 patients (54%). The improvement of total incontinence episodes during the temporary stimulation period was a median of 83% (range 25-93%). This may be a viable treatment option for radiation-induced faecal incontinence.
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Affiliation(s)
- Yasuko Maeda
- Surgical Research Unit, Aarhus University Hospital, Aarhus, Denmark.
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Clinical and dosimetric predictors of late rectal toxicity after conformal radiation for localized prostate cancer: Results of a large multicenter observational study. Radiother Oncol 2009; 93:197-202. [DOI: 10.1016/j.radonc.2009.09.004] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 09/09/2009] [Accepted: 09/12/2009] [Indexed: 11/23/2022]
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Matzinger O, Duclos F, Bergh AVD, Carrie C, Villà S, Kitsios P, Poortmans P, Sundar S, van der Steen-Banasik E, Gulyban A, Collette L, Bolla M. Acute toxicity of curative radiotherapy for intermediate- and high-risk localised prostate cancer in the EORTC trial 22991. Eur J Cancer 2009; 45:2825-34. [DOI: 10.1016/j.ejca.2009.07.009] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2009] [Revised: 07/14/2009] [Accepted: 07/17/2009] [Indexed: 11/24/2022]
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Fiorino C, Valdagni R, Rancati T, Sanguineti G. Dose–volume effects for normal tissues in external radiotherapy: Pelvis. Radiother Oncol 2009; 93:153-67. [DOI: 10.1016/j.radonc.2009.08.004] [Citation(s) in RCA: 224] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2009] [Revised: 08/11/2009] [Accepted: 08/11/2009] [Indexed: 02/07/2023]
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Nguyen CT, Kattan MW. Development of a prostate cancer metagram: a solution to the dilemma of which prediction tool to use in patient counseling. Cancer 2009; 115:3039-45. [PMID: 19544545 DOI: 10.1002/cncr.24355] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Many treatment options are available to the human with clinically localized prostate cancer, including surgery, radiation, and even active surveillance. To the authors' knowledge, there is no consensus on the optimal management of this patient population, with most clinicians tending to recommend the treatment with which they are most familiar. Effective patient counseling allowing informed decision making can be best achieved with a formalized system that offers accurate predictions of outcomes for all available treatment approaches. The authors organized the currently available prostate cancer prediction tools toward the formation of a metagram that can be used to tailor management to the individual patient. A comprehensive review of the literature was performed to identify published prediction tools intended for use in prostate cancer. Tools were categorized by a combination of treatment modality and the outcome being predicted, and incorporated into a metagram constructed of 16 different treatment options and 10 outcomes related to cancer control, survival, and morbidity. A search of the literature revealed 44 prostate cancer prediction tools that assessed at least 1 of the 160 treatment/outcome combinations that comprise the metagram. Only 31 cells of the metagram were populated with currently available tools. Prediction tools offer the most accurate estimates of outcomes in prostate cancer, but their current role in patient counseling is complicated by the large number of existing tools, as well as a lack of comparative data. To address this, the authors incorporated the most relevant prediction tools currently available into a prostate cancer metagram that may offer evidence-based and individualized predictions for multiple endpoints after all available treatment options in clinically localized prostate cancer. The metagram also reveals areas of deficiency in the current catalog of prediction tools. Many more prediction tools are needed. Cancer 2009;115(13 suppl):3039-45. (c) 2009 American Cancer Society.
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Affiliation(s)
- Carvell T Nguyen
- Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, Ohio, USA
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To Bleed or Not to Bleed. A Prediction Based on Individual Gene Profiling Combined With Dose–Volume Histogram Shapes in Prostate Cancer Patients Undergoing Three-Dimensional Conformal Radiation Therapy. Int J Radiat Oncol Biol Phys 2009; 74:1431-40. [DOI: 10.1016/j.ijrobp.2008.10.021] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2008] [Revised: 09/29/2008] [Accepted: 10/07/2008] [Indexed: 11/23/2022]
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Abstract
PURPOSE OF REVIEW To review the use of measurement tools for reporting gastrointestinal toxicity in radiation oncology to highlight recent findings of potential interest to those involved in the treatment of tumors in the pelvis, assessment of survivorship issues or management of bowel effects. RECENT FINDINGS Multiple measurement tools are being used in radiation oncology studies involving both clinician and patient-reported outcomes. The increasing availability of accurate data on radiation doses and dose-volumes to normal tissues is enabling identification of critical areas where dose should be reduced to minimize organ damage. SUMMARY Measurement tools for gastrointestinal symptoms are important to highlight therapeutic benefit for the expanding investigations of treatment intensification approaches and methods for toxicity reduction. The increasing use of the CTCAEv3 scales is a step forward, but further research is required to refine the system and improve its ease of use within routine clinical practice.
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Varela E, Antolín M, Guarner F, Verges R, Giralt J, Malagelada JR. Faecal DNA and calprotectin as biomarkers of acute intestinal toxicity in patients undergoing pelvic radiotherapy. Aliment Pharmacol Ther 2009; 30:175-85. [PMID: 19392859 DOI: 10.1111/j.1365-2036.2009.04019.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND Acute intestinal toxicity is a frequent complication that may lead to interruption of treatment in patients undergoing pelvic radiotherapy. Reliable, non-invasive biological markers to evidence their severity are not yet available. AIM To test faecal DNA and calprotectin as potential biomarkers of intestinal toxicity caused by pelvic radiotherapy. METHODS Patients were categorized according to the location of the cancer as nonrectal (n = 25) and rectal (n = 27). Four stool samples were collected at weeks w0, w3, w5 (end of radiotherapy) and w7. Faecal DNA was determined by quantitative PCR and calprotectin by ELISA. Intestinal toxicity was scored according to the Common Toxicity Criteria. RESULTS In the nonrectal group, acute diarrhoea toxicity was present in 80% of patients, faecal DNA increased 10-fold during radiotherapy (1.5 x 10(3) copies/mg dry weight, 9.5 x 10(2)-8.8 x 10(3) at w0, median and interquartile range vs. 1.3 x 10(4), 1.9 x 10(3)-3.9 x 10(4) at w5, P < 0.01), but was not recovered at w7 (3.4 x 10(3), 1.5 x 10(3)-4.1 x 10(4)) and calprotectin doubled during treatment at w3 and w5. No significant changes in faecal markers were found in the rectal group. CONCLUSION Faecal excretion of human DNA and calprotectin increased during pelvic radiotherapy treatment, and may be a good objective biomarker of intestinal damage in nonrectal cancer patients.
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Affiliation(s)
- E Varela
- Digestive System Research Unit, University Hospital Vall d'Hebron, Autonomous University of Barcelona, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas, Barcelona, Spain
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Nguyen CT, Zelefsky MJ, Kattan MW. The current state of brachytherapy nomograms for patients with clinically localized prostate cancer. Cancer 2009; 115:3121-7. [DOI: 10.1002/cncr.24344] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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