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Maniscalco A, Mathew E, Parsons D, Visak J, Arbab M, Alluri P, Li X, Wandrey N, Lin MH, Rahimi A, Jiang S, Nguyen D. Multimodal radiotherapy dose prediction using a multi-task deep learning model. Med Phys 2024; 51:3932-3949. [PMID: 38710210 PMCID: PMC11147699 DOI: 10.1002/mp.17115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Revised: 03/26/2024] [Accepted: 04/21/2024] [Indexed: 05/08/2024] Open
Abstract
BACKGROUND In radiation therapy (RT), accelerated partial breast irradiation (APBI) has emerged as an increasingly preferred treatment modality over conventional whole breast irradiation due to its targeted dose delivery and shorter course of treatment. APBI can be delivered through various modalities including Cobalt-60-based systems and linear accelerators with C-arm, O-ring, or robotic arm design. Each modality possesses distinct features, such as beam energy or the degrees of freedom in treatment planning, which influence their respective dose distributions. These modality-specific considerations emphasize the need for a quantitative approach in determining the optimal dose delivery modality on a patient-specific basis. However, manually generating treatment plans for each modality across every patient is time-consuming and clinically impractical. PURPOSE We aim to develop an efficient and personalized approach for determining the optimal RT modality for APBI by training predictive models using two different deep learning-based convolutional neural networks. The baseline network performs a single-task (ST), predicting dose for a single modality. Our proposed multi-task (MT) network, which is capable of leveraging shared information among different tasks, can concurrently predict dose distributions for various RT modalities. Utilizing patient-specific input data, such as a patient's computed tomography (CT) scan and treatment protocol dosimetric goals, the MT model predicts patient-specific dose distributions across all trained modalities. These dose distributions provide patients and clinicians quantitative insights, facilitating informed and personalized modality comparison prior to treatment planning. METHODS The dataset, comprising 28 APBI patients and their 92 treatment plans, was partitioned into training, validation, and test subsets. Eight patients were dedicated to the test subset, leaving 68 treatment plans across 20 patients to divide between the training and validation subsets. ST models were trained for each modality, and one MT model was trained to predict doses for all modalities simultaneously. Model performance was evaluated across the test dataset in terms of Mean Absolute Percent Error (MAPE). We conducted statistical analysis of model performance using the two-tailed Wilcoxon signed-rank test. RESULTS Training times for five ST models ranged from 255 to 430 min per modality, totaling 1925 min, while the MT model required 2384 min. MT model prediction required an average of 1.82 s per patient, compared to ST model predictions at 0.93 s per modality. The MT model yielded MAPE of 1.1033 ± 0.3627% as opposed to the collective MAPE of 1.2386 ± 0.3872% from ST models, and the differences were statistically significant (p = 0.0003, 95% confidence interval = [-0.0865, -0.0712]). CONCLUSION Our study highlights the potential benefits of a MT learning framework in predicting RT dose distributions across various modalities without notable compromises. This MT architecture approach offers several advantages, such as flexibility, scalability, and streamlined model management, making it an appealing solution for clinical deployment. With such a MT model, patients can make more informed treatment decisions, physicians gain more quantitative insight for pre-treatment decision-making, and clinics can better optimize resource allocation. With our proposed goal array and MT framework, we aim to expand this work to a site-agnostic dose prediction model, enhancing its generalizability and applicability.
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Affiliation(s)
- Austen Maniscalco
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Ezek Mathew
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - David Parsons
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Justin Visak
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Mona Arbab
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Prasanna Alluri
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Xingzhe Li
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Narine Wandrey
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Mu-Han Lin
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Asal Rahimi
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Steve Jiang
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Dan Nguyen
- Medical Artificial Intelligence and Automation Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
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Badillo-Alvarado AH, Martín-Tovar EA, Molina-Salinas GM, Sandoval-Méndez AC, Sarricolea-Puch A. Association between the cardiac contact distance and the maximum dose at the left anterior descending coronary artery in post mastectomized patients. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2022; 61:407-423. [PMID: 35819511 DOI: 10.1007/s00411-022-00983-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 06/26/2022] [Indexed: 06/15/2023]
Abstract
The clinical information on the relationship between the cardiac contact distance (CCD), the maximum dose (Dmax) delivered to the left anterior descending (LAD) coronary artery and the mean heart dose has mostly focused on patients with breast-conserving surgery (BCS), being scarce in postmastectomy patients. The aim of this study is to determine the association between the CCD and the Dmax delivered to the LAD. The secondary objective was to evaluate the dosimetric results of comparing three-dimensional conformal radiotherapy (3D-CRT) to intensity-modulated radiotherapy (IMRT) and volumetric modulated arc therapy (VMAT) techniques for post mastectomized breast cancer patients with irradiation to the left chest wall. 53 cases of women who received adjuvant standard fractionated postmastectomy radiotherapy (PMRT) were used. Three types of plans were created for each patient: 3D-CRT, seven equidistant IMRT fields, and four partial VMAT arcs. Correlations were evaluated using Pearson's correlation coefficient. Plans made with IMRT and VMAT showed improved homogeneity and conformity. Associations between CCD and Dmax to LAD were positive for all three plan types. Compared to 3D-CRT, the modulated intensity plans obtained better dose homogeneity and conformity to the target volume. The LAD and heart doses were significantly lower for IMRT and VMAT plans. The CCD can be used as a predictor of the maximum and mean doses of the LAD. Modulated intensity techniques allow for better dose distribution and dose reduction to the heart and LAD.
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Affiliation(s)
- A H Badillo-Alvarado
- División de Oncología y Uronefrología, Departamento de Radioterapia, Unidad Médica de Alta Especialidad, Hospital de Especialidades del Centro Médico Nacional "Ignacio García Téllez", Instituto Mexicano del Seguro Social, CP 97150, Mérida, Yucatán, México
| | - E A Martín-Tovar
- División de Oncología y Uronefrología, Departamento de Radioterapia, Unidad Médica de Alta Especialidad, Hospital de Especialidades del Centro Médico Nacional "Ignacio García Téllez", Instituto Mexicano del Seguro Social, CP 97150, Mérida, Yucatán, México.
| | - G M Molina-Salinas
- Unidad de Investigación Médica Yucatán, Unidad Médica de Alta Especialidad Hospital de Especialidades 1 Mérida, Yucatán, Instituto Mexicano del Seguro Social, CP 97150, Mérida, Yucatán, México
| | - A C Sandoval-Méndez
- División de Oncología y Uronefrología, Departamento de Radioterapia, Unidad Médica de Alta Especialidad, Hospital de Especialidades del Centro Médico Nacional "Ignacio García Téllez", Instituto Mexicano del Seguro Social, CP 97150, Mérida, Yucatán, México
| | - A Sarricolea-Puch
- División de Oncología y Uronefrología, Departamento de Radioterapia, Unidad Médica de Alta Especialidad, Hospital de Especialidades del Centro Médico Nacional "Ignacio García Téllez", Instituto Mexicano del Seguro Social, CP 97150, Mérida, Yucatán, México
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Frederick A, Roumeliotis M, Grendarova P, Quirk S. Performance of a knowledge-based planning model for optimizing intensity-modulated radiotherapy plans for partial breast irradiation. J Appl Clin Med Phys 2021; 23:e13506. [PMID: 34936195 PMCID: PMC8906226 DOI: 10.1002/acm2.13506] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 11/09/2021] [Accepted: 12/04/2021] [Indexed: 12/25/2022] Open
Abstract
Purpose To evaluate a knowledge‐based (KB) planning model for RapidPlan, generated using a five‐field intensity‐modulated radiotherapy (IMRT) class solution beam strategy and rigorous dosimetric constraints for accelerated partial breast irradiation (APBI). Materials and methods The RapidPlan model was configured using 64 APBI treatment plans and validated for 120 APBI patients who were not included in the training dataset. KB plan dosimetry was compared to clinical plan dosimetry, the clinical planning constraints, and the constraints used in phase III APBI trials. Dosimetric differences between clinical and KB plans were evaluated using paired two‐tailed Wilcoxon signed‐rank tests. Results KB planning was able to produce IMRT‐based APBI plans in a single optimization without manual intervention that are comparable or better than the conventionally optimized, clinical plans. Comparing KB plans to clinical plans, differences in PTV, heart, contralateral breast, and ipsilateral lung dose–volume metrics were not clinically significant. The ipsilateral breast volume receiving at least 50% of the prescription dose was statistically and clinically significantly lower in the KB plans. Conclusion KB planning for IMRT‐based APBI provides equivalent or better dosimetry compared to conventional inverse planning. This model may be reliably applied in clinical practice and could be used to transfer planning expertise to ensure consistency in APBI plan quality.
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Affiliation(s)
- Amy Frederick
- Department of Physics and AstronomyUniversity of CalgaryCalgaryAlbertaCanada
- Division of Medical PhysicsTom Baker Cancer CentreCalgaryAlbertaCanada
| | - Michael Roumeliotis
- Department of Physics and AstronomyUniversity of CalgaryCalgaryAlbertaCanada
- Division of Medical PhysicsTom Baker Cancer CentreCalgaryAlbertaCanada
- Department of OncologyUniversity of CalgaryCalgaryAlbertaCanada
| | - Petra Grendarova
- Department of OncologyUniversity of CalgaryCalgaryAlbertaCanada
- Division of Radiation OncologyGrande Prairie Cancer CentreGrande PrairieAlbertaCanada
| | - Sarah Quirk
- Department of Physics and AstronomyUniversity of CalgaryCalgaryAlbertaCanada
- Division of Medical PhysicsTom Baker Cancer CentreCalgaryAlbertaCanada
- Department of OncologyUniversity of CalgaryCalgaryAlbertaCanada
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Qiu J, Zhang S, Lv B, Zheng X. Cardiac Dose Control and Optimization Strategy for Left Breast Cancer Radiotherapy With Non-Uniform VMAT Technology. Technol Cancer Res Treat 2021; 20:15330338211053752. [PMID: 34806481 PMCID: PMC8606722 DOI: 10.1177/15330338211053752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Purpose: A novel in-house technology "Non-Uniform VMAT (NU-VMAT)" was developed for automated cardiac dose reduction and treatment planning optimization in the left breast radiotherapy. Methods: The NU-VMAT model based on IGM (gantry MLC Movement coefficient index) was established to optimize the volumetric modulated arc therapy (VMAT) MLC movement and modulation intensity in certain gantry angles. The ESAPI embedded in Eclipse® was employed to connect TPS and the optimization program via I/O relevant DICOM RT files. The adjuvant whole-breast radiotherapy of 14 patients with left breast cancer was replanned using our NU-VMAT technology in comparison with VMAT and IMRT technology. Dosimetric parameters including D1%, D99%, and Dmean of PTV, V5, V10, and V20 of ipisilateral lung, V5, D20, D30, and Dmean of heart, monitor units (MUs), and delivery time derived from IMRT, VMAT, and NU-VMAT plans were evaluated for plan quality and delivery efficiency. The quality assurance (QA) was conducted using both point-dose and planar-dose measurements for all treatment plans. Results: The IGM-NU-VMAT curves with plan optimization (range from 50% to 147%) were converged more significantly than IGM-VMAT curves (range from 0% to 297%). The dose distribution requirements of the target and normal tissues could be met using IMRT, VMAT, or NU-VMAT; the lowest Dmean was achieved in NU-VMAT plans (5.38 ± 0.46 Gy vs 5.63 ± 0.61 Gy in IMRT and 7.95 ± 0.52 Gy in VMAT plans). Statistically significant differences were found in terms of delivery time and MU when comparing IMRT with VMAT and NU-VMAT plans (P < .05). In comparison with IMRT plans, the MU and delivery time in NU-VMAT plans dramatically decreased by 69.8% and 28.4%, respectively. Moreover, NU-VMAT plans showed a high gamma passing rate (96.5% ± 1.11) in plane dose verification and minimal dose difference (2.4% ± 0.19) in point absolute dose verification. Conclusion: Our non-uniform VMAT facilitated the treatment strategy optimization for left breast cancer radiotherapy with dosimetric advantage in cardiac dose reduction and delivery efficiency in comparison with the conventional VMAT and IMRT.
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Affiliation(s)
- Jianjian Qiu
- Huadong Hospital, Fudan University, Shanghai, China
| | - Shujun Zhang
- Huadong Hospital, Fudan University, Shanghai, China
| | - Bo Lv
- Huadong Hospital, Fudan University, Shanghai, China
| | - Xiangpeng Zheng
- Huadong Hospital, Fudan University, Shanghai, China
- Xiangpeng Zheng, MD, Department of Radiation Oncology, Huadong Hospital, Fudan University, 221 West Yan’an Road, Shanghai 200040, China.
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Hoekstra N, Habraken S, Swaak-Kragten A, Pignol JP, Hoogeman M. Fiducial marker motion relative to the tumor bed has a significant impact on PTV margins in partial breast irradiation. Radiother Oncol 2021; 163:1-6. [PMID: 34329655 DOI: 10.1016/j.radonc.2021.07.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 06/28/2021] [Accepted: 07/19/2021] [Indexed: 10/20/2022]
Abstract
INTRODUCTION With the introduction of accelerated partial breast irradiation (APBI) and the trend of reducing the number of fractions, the geometric accuracy of treatment delivery becomes critical. APBI patient setup is often based on fiducials, as the seroma is frequently not visible on pretreatment imaging. We assessed the motion of fiducials relative to the tumor bed between planning CT and treatment, and calculated margins to compensate for this motion. METHODS A cohort of seventy patients treated with APBI on a Cyberknife was included. Planning and in-room pretreatment CT scans were registered on the tumor bed. Residual motion of the centers of mass of surgical clips and interstitial gold markers was calculated. We calculated the margins required per desired percentage of patients with 100% CTV coverage, and the systematic and random errors for fiducial motion. RESULTS For a single fraction treatment, a margin of 1.8 mm would ensure 100% CTV coverage in 90% of patients when using surgical clips for patient set-up. When using interstitial markers, the margin should be 2.2 mm. The systematic and random errors were 0.46 mm for surgical clip motion and 0.60 mm for interstitial marker motion. No clinical factors were found predictive for fiducial motion. CONCLUSIONS Fiducial motion relative to the tumor bed between planning CT and APBI treatment is non-negligible and should be included in the PTV margin calculation to prevent geographical miss. Systematic and random errors of fiducial motion were combined with other geometric uncertainties to calculate comprehensive PTV margins for different treatment techniques.
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Affiliation(s)
- Nienke Hoekstra
- Erasmus MC Cancer Institute, Department of Radiation Oncology, Rotterdam, The Netherlands.
| | - Steven Habraken
- Erasmus MC Cancer Institute, Department of Radiation Oncology, Rotterdam, The Netherlands
| | | | | | - Mischa Hoogeman
- Erasmus MC Cancer Institute, Department of Radiation Oncology, Rotterdam, The Netherlands
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Multicatheter interstitial brachytherapy versus stereotactic radiotherapy with CyberKnife for accelerated partial breast irradiation: a comparative treatment planning study with respect to dosimetry of organs at risk. Radiol Oncol 2021; 55:229-239. [PMID: 33768766 PMCID: PMC8042824 DOI: 10.2478/raon-2021-0016] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 02/02/2021] [Indexed: 01/02/2023] Open
Abstract
Background The aim of the study was to dosimetrically compare multicatheter interstitial brachytherapy (MIBT) and stereotactic radiotherapy with CyberKnife (CK) for accelerated partial breast irradiation (APBI) especially concerning the dose of organs at risk (OAR-s). Patients and methods Treatment plans of thirty-two MIBT and CK patients were compared. The OAR-s included ipsilateral non-target and contralateral breast, ipsilateral and contralateral lung, skin, ribs, and heart for left-sided cases. The fractionation was identical (4 x 6.25 Gy) in both treatment groups. The relative volumes (e.g. V100, V90) receiving a given relative dose (100%, 90%), and the relative doses (e.g. D0.1cm3, D1cm3) delivered to the most exposed small volumes (0.1 cm3, 1 cm3) were calculated from dose-volume histograms. All dose values were related to the prescribed dose (25 Gy). Results Regarding non-target breast CK performed slightly better than MIBT (V100: 0.7% vs. 1.6%, V50: 10.5% vs. 12.9%). The mean dose of the ipsilateral lung was the same for both techniques (4.9%), but doses irradiated to volume of 1 cm3 were lower with MIBT (36.1% vs. 45.4%). Protection of skin and rib was better with MIBT. There were no significant differences between the dose-volume parameters of the heart, but with MIBT, slightly larger volumes were irradiated by 5% dose (V5: 29.9% vs. 21.2%). Contralateral breast and lung received a somewhat higher dose with MIBT (D1cm3: 2.6% vs. 1.8% and 3.6% vs. 2.5%). Conclusions The target volume can be properly irradiated by both techniques with similar dose distributions and high dose conformity. Regarding the dose to the non-target breast, heart, and contralateral organs the CK was superior, but the nearby organs (skin, ribs, ipsilateral lung) received less dose with MIBT. The observed dosimetric differences were small but significant in a few parameters at the examined patient number. More studies are needed to explore whether these dosimetric findings have clinical significance.
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de Paula U, D'Angelillo RM, Andrulli AD, Apicella G, Caruso C, Ghini C, Gomellini S, Ponti E, Pompei M, Caccavari A, Petrocchi A, Costarelli L, Giordano M, La Pinta M, Meli EZ, Mauri M, Minelli M, Rossi R, Scavina P, Broglia L, Ponzani T, Loreti A, Fortunato L. Long-Term Outcomes of Once-Daily Accelerated Partial-Breast Irradiation With Tomotherapy: Results of a Phase 2 Trial. Int J Radiat Oncol Biol Phys 2021; 109:678-687. [PMID: 33098960 DOI: 10.1016/j.ijrobp.2020.10.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 10/05/2020] [Accepted: 10/07/2020] [Indexed: 01/18/2023]
Abstract
PURPOSE We report long-term outcomes of phase 2 trial on patients with invasive breast cancer treated with accelerated partial-breast irradiation (APBI) using tomotherapy after breast conservative surgery. METHODS AND MATERIALS From December 2010 to December 2018, we treated 338 women with APBI-tomotherapy: 38.5 Gy in 10 once-daily fractions. Patients selected were age ≥50 years old, with ≤3 cm in size unifocal tumor and at least 2 mm of clear margins. Disease outcomes were analyzed by clinicopathologic characteristics, molecular phenotypes, and American Society for Radiation Oncology (ASTRO) 2017 updated consensus groupings. RESULTS The median age was 65 years (range, 50-86). The invasive ductal (87.5%) and the luminal A-like molecular phenotype (70%) were the most common tumors. Overall 242 patients (71.6%) were considered "suitable" for enrollment in APBI according to the eligibility criteria of the ASTRO-2017 consensus statement. With a median follow-up of 76 months (range, 17-113), 2 patients (0.6%) had an invasive ipsilateral breast tumor recurrence (IBTR), and 2 patients (0.6%) had an axillary ipsilateral failure. The rate of local control in terms of free of IBTR was 99.4% and locoregional control (no recurrence in ipsilateral breast as well as in regional nodes) was 98.8%. Progression-free survival was 98.4% and 92% at 5 and 10 years, respectively. Acute and late skin toxicity, graded according to the Common Terminology Criteria for Adverse Events, were 7.7% (G1) and 0.6% (G2) and 4.4% (G1) and 1.1% (G2), respectively. There were no grade 3/4 toxicities, however. Very few patients (2%) or physicians (2%) assessed cosmetic outcome as fair or poor at the 2-year follow-up. CONCLUSIONS This phase 2 trial on APBI-tomotherapy shows excellent long-term results. Once-daily fractionation schedule was well tolerated with a low rate of adverse events and worse cosmetic outcome. In this series, even among those deemed cautionary or unsuitable for APBI by ASTRO criteria, we demonstrated a low rate of IBTR.
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MESH Headings
- Aged
- Aged, 80 and over
- Breast Neoplasms/diagnostic imaging
- Breast Neoplasms/pathology
- Breast Neoplasms/radiotherapy
- Breast Neoplasms/surgery
- Carcinoma, Ductal, Breast/diagnostic imaging
- Carcinoma, Ductal, Breast/pathology
- Carcinoma, Ductal, Breast/radiotherapy
- Carcinoma, Ductal, Breast/surgery
- Carcinoma, Lobular/diagnostic imaging
- Carcinoma, Lobular/pathology
- Carcinoma, Lobular/radiotherapy
- Carcinoma, Lobular/surgery
- Consensus
- Dose Fractionation, Radiation
- Esthetics
- Female
- Humans
- Kaplan-Meier Estimate
- Margins of Excision
- Mastectomy, Segmental
- Middle Aged
- Neoplasm Recurrence, Local
- Progression-Free Survival
- Radiotherapy/methods
- Radiotherapy, Intensity-Modulated
- Time Factors
- Treatment Outcome
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Affiliation(s)
- Ugo de Paula
- Radioterapia Oncologica, Ospedale San Giovanni Addolorata, Rome, Italy.
| | - Rolando Maria D'Angelillo
- Radioterapia, Dipartimento di Biomedicina e Prevenzione, Università degli Studi di Roma Tor Vergata, Rome, Italy
| | | | | | - Cristina Caruso
- Radioterapia Oncologica, Ospedale San Giovanni Addolorata, Rome, Italy
| | - Christian Ghini
- Radioterapia Oncologica, Ospedale San Giovanni Addolorata, Rome, Italy
| | - Sara Gomellini
- Radioterapia Oncologica, Ospedale San Giovanni Addolorata, Rome, Italy
| | - Elisabetta Ponti
- Radioterapia Oncologica, Ospedale San Giovanni Addolorata, Rome, Italy
| | - Marco Pompei
- Radioterapia Oncologica, Ospedale San Giovanni Addolorata, Rome, Italy
| | | | | | | | - Marco Giordano
- Anatomia Patologica Ospedale San Giovanni Addolorata, Rome, Italy
| | - Massimo La Pinta
- Chirurgia Senologica Ospedale San Giovanni Addolorata, Rome, Italy
| | | | - Maria Mauri
- Oncologia Medica, Ospedale San Giovanni Addolorata, Rome, Italy
| | - Mauro Minelli
- Oncologia Medica, Ospedale San Giovanni Addolorata, Rome, Italy
| | - Rosalinda Rossi
- Oncologia Medica, Ospedale San Giovanni Addolorata, Rome, Italy
| | - Paola Scavina
- Oncologia Medica, Ospedale San Giovanni Addolorata, Rome, Italy
| | - Laura Broglia
- Diagnostica per Immagini, Ospedale San Giovanni Addolorata, Rome, Italy
| | - Tatiana Ponzani
- Diagnostica per Immagini, Ospedale San Giovanni Addolorata, Rome, Italy
| | - Andrea Loreti
- Chirurgia Plastica e Ricostruttiva, Ospedale San Giovanni Addolorata, Rome, Italy
| | - Lucio Fortunato
- Chirurgia Senologica Ospedale San Giovanni Addolorata, Rome, Italy
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Yamauchi R, Mizuno N, Itazawa T, Kawamori J. The influence of respiratory motion on dose distribution in accelerated partial breast irradiation using volumetric modulated arc therapy. Phys Med 2020; 80:23-33. [PMID: 33075732 DOI: 10.1016/j.ejmp.2020.09.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 09/25/2020] [Accepted: 09/28/2020] [Indexed: 12/20/2022] Open
Abstract
PURPOSE Accelerated partial breast irradiation (APBI) is alternative treatment option for patients with early stage breast cancer. The interplay effect on volumetric modulated arc therapy APBI (VMAT-APBI) has not been clarified. This study aimed to evaluate the feasibility of VMAT-APBI for patients with small breasts and investigate the amplitude of respiratory motion during VMAT-APBI delivery that significantly affects dose distribution. METHODS The VMAT-APBI plans were generated with 28.5 Gy in five fractions. We performed patient-specific quality assurance using Delta4 phantom under static conditions. We also measured point dose and dose distribution using the ionization chamber and radiochromic film under static and moving conditions of 2, 3 and 5 mm. We compared the measured and calculated point doses and dose distributions by dose difference and gamma passing rates. RESULTS A total of 20 plans were generated; the dose distributions were consistent with those of previous reports. For all measurements under static conditions, the measured and calculated point doses and dose distributions showed good agreement. The dose differences for chamber measurement were within 3%, regardless of moving conditions. The mean gamma passing rates with 3%/2 mm criteria in the film measurement under static conditions and with 2 mm, 3 mm, and 5 mm of amplitude were 95.0 ± 2.0%, 93.3 ± 3.3%, 92.1 ± 6.2% and 84.8 ± 7.8%, respectively. The difference between 5 mm amplitude and other conditions was statistically significant. CONCLUSIONS Respiratory management should be considered for the risk of unintended dose distribution if the respiratory amplitude is >5 mm.
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Affiliation(s)
- Ryohei Yamauchi
- Department of Radiation Oncology, St. Luke's International Hospital, Tokyo, Japan.
| | - Norifumi Mizuno
- Department of Radiation Oncology, St. Luke's International Hospital, Tokyo, Japan
| | - Tomoko Itazawa
- Department of Radiation Oncology, St. Luke's International Hospital, Tokyo, Japan
| | - Jiro Kawamori
- Department of Radiation Oncology, St. Luke's International Hospital, Tokyo, Japan
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Pasalic D, Strom EA, Allen PK, Williamson TD, Poenisch F, Amos RA, Woodward WA, Stauder MC, Shaitelman SF, Smith BD, Perkins GH, Tereffe W, Hoffman KE. Proton Accelerated Partial Breast Irradiation: Clinical Outcomes at a Planned Interim Analysis of a Prospective Phase 2 Trial. Int J Radiat Oncol Biol Phys 2020; 109:441-448. [PMID: 32946965 DOI: 10.1016/j.ijrobp.2020.09.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 09/07/2020] [Accepted: 09/09/2020] [Indexed: 11/24/2022]
Abstract
PURPOSE To perform a planned interim analysis of acute (within 12 months) and late (after 12 months) toxicities and cosmetic outcomes after proton accelerated partial breast irradiation (APBI). METHODS AND MATERIALS A total of 100 patients with pTis or pT1-2 N0 (≤3cm) breast cancer status after segmental mastectomy were enrolled in a single-arm phase 2 study from 2010 to 2019. The clinically determined postlumpectomy target volume, including tumor bed surgical clips and operative-cavity soft-tissue changes seen on imaging plus a radial clinical expansion, was irradiated with passively scattered proton APBI (34 Gy in 10 fractions delivered twice daily with a minimum 6-hour interfraction interval). Patients were evaluated at protocol-specific time intervals for recurrence, physician reports of cosmetic outcomes and toxicities, and patient reports of cosmetic outcomes and satisfaction with the treatment or experience. RESULTS Median follow-up was 24 months (interquartile range [IQR], 12-43 months). Local control and overall survival were 100% at 12 and 24 months. There were no acute or late toxicities of grade 3 or higher; no patients experienced fat necrosis, fibrosis, infection, or breast shrinkage. Excellent or good cosmesis at 12 months was reported by 91% of patients and 94% of physicians; at the most recent follow-up, these were 94% and 87%, respectively. The most commonly reported late cosmetic effect was telangiectasis (17%). The total patient satisfaction rate for treatment and results at 12 and 24 months was 96% and 100%, respectively. Patients' mean time away from work was 5 days (IQR, 2-5 days), and the median out-of-pocket cost was $700 (IQR, $100-$1600). The mean left-sided heart dose was 2 cGy (range, 0.2-75 cGy), and the mean ipsilateral lung dose was 19 cGy (range, 0.2-164 cGy). CONCLUSIONS Proton APBI is a maturing treatment option with high local control, favorable intermediate-term cosmesis, high treatment satisfaction, low treatment burden, and exceptional heart and lung sparing.
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Affiliation(s)
- Dario Pasalic
- Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, Texas
| | - Eric A Strom
- Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, Texas.
| | - Pamela K Allen
- Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, Texas
| | - Tyler D Williamson
- Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, Texas
| | - Falk Poenisch
- Department of Radiation Physics, MD Anderson Cancer Center, The University of Texas, Houston, Texas
| | - Richard A Amos
- Department of Radiation Physics, MD Anderson Cancer Center, The University of Texas, Houston, Texas; Department of Proton and Advanced Radiation Therapy Group, Department of Medical Physics & Biomedical Engineering, University College London, London, United Kingdom
| | - Wendy A Woodward
- Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, Texas
| | - Michael C Stauder
- Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, Texas
| | - Simona F Shaitelman
- Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, Texas
| | - Benjamin D Smith
- Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, Texas
| | - George H Perkins
- Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, Texas
| | - Welela Tereffe
- Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, Texas
| | - Karen E Hoffman
- Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, Texas
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Hoekstra N, Habraken S, Swaak-Kragten A, Breedveld S, Pignol JP, Hoogeman M. Reducing the Risk of Secondary Lung Cancer in Treatment Planning of Accelerated Partial Breast Irradiation. Front Oncol 2020; 10:1445. [PMID: 33014782 PMCID: PMC7461936 DOI: 10.3389/fonc.2020.01445] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 07/08/2020] [Indexed: 01/01/2023] Open
Abstract
Purpose: Adjuvant accelerated partial breast irradiation (APBI) results in low local recurrence risks. However, the survival benefit of adjuvant radiotherapy APBI for low-risk breast cancer might partially be offset by the risk of radiation-induced lung cancer. Reducing the lung dose mitigates this risk, but this could result in higher doses to the ipsilateral breast. Different external beam APBI techniques are equally conformal and homogenous, but the intermediate to low dose distribution differs. Thus, the risk of toxicity is different. The purpose of this study is to quantify the trade-off between secondary lung cancer risk and breast dose in treatment planning and to compare an optimal coplanar and non-coplanar technique. Methods: A total of 440 APBI treatment plans were generated using automated treatment planning for a coplanar VMAT beam-setup and a non-coplanar robotic stereotactic radiotherapy beam-setup. This enabled an unbiased comparison of two times 11 Pareto-optimal plans for 20 patients, gradually shifting priority from maximum lung sparing to maximum ipsilateral breast sparing. The excess absolute risks of developing lung cancer and breast fibrosis were calculated using the Schneider model for lung cancer and the Avanzo model for breast fibrosis. Results: Prioritizing lung sparing reduced the mean lung dose from 2.2 Gy to as low as 0.3 Gy for the non-coplanar technique and from 1.9 Gy to 0.4 Gy for the coplanar technique, corresponding to a 7- and 4-fold median reduction of secondary lung cancer risk, respectively, compared to prioritizing breast sparing. The increase in breast dose resulted in a negligible 0.4% increase in fibrosis risk. The use of non-coplanar beams resulted in lower secondary cancer and fibrosis risks (p < 0.001). Lung sparing also reduced the mean heart dose for both techniques. Conclusions: The risk of secondary lung cancer of external beam APBI can be dramatically reduced by prioritizing lung sparing during treatment planning. The associated increase in breast dose did not lead to a relevant increase in fibrosis risk. The use of non-coplanar beams systematically resulted in the lowest risks of secondary lung cancer and fibrosis. Prioritizing lung sparing during treatment planning could increase the overall survival of early-stage breast cancer patients by reducing mortality due to secondary lung cancer and cardiovascular toxicity.
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Affiliation(s)
- Nienke Hoekstra
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, Netherlands
| | - Steven Habraken
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, Netherlands
| | | | - Sebastiaan Breedveld
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, Netherlands
| | | | - Mischa Hoogeman
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, Netherlands
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11
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Stelczer G, Tatai-Szabó D, Major T, Mészáros N, Polgár C, Pálvölgyi J, Pesznyák C. Measurement of dose exposure of image guidance in external beam accelerated partial breast irradiation: Evaluation of different techniques and linear accelerators. Phys Med 2019; 63:70-78. [PMID: 31221412 DOI: 10.1016/j.ejmp.2019.05.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 05/10/2019] [Accepted: 05/25/2019] [Indexed: 10/26/2022] Open
Abstract
INTRODUCTION Verifying the patient position is always an essential part of the treatment process, especially in hypofractionated treatments such as accelerated partial breast irradiation (APBI). The purpose of the study was to compare five image guidance techniques with respect to imaging dose and image quality. METHODS AND MATERIALS We chose five types of imaging methods applicable for APBI and measured their dose exposure on four different accelerators (Synergy, TrueBeam, Artiste and CyberKnife). Absorbed dose was measured with ionization chamber in thorax phantom. Besides dose exposure image quality was also compared. RESULTS The lowest dose exposure was measured with kV-kV planar imaging followed by kV-CBCT, MV-MV pair and MV-CBCT in ascending order. Average phantom dose with kV-kV image pair on CyberKnife was 0.01 cGy as the lowest and with MV-CBCT on Artiste was 7.11 cGy as the highest. Average dose exposures of MV-MV images with TrueBeam, Synergy and Artiste were 1.18 cGy, 2.13 cGy and 1.61 cGy, respectively, with similar image quality. For the same machines the doses of kV-CT imaging were comparable: 0.65 cGy, 0.65 cGy and 0.52 cGy, with some differences in image quality. MV-CBCT technique resulted in the highest dose and poorest image quality. CONCLUSIONS In APBI the position of the patient and tumour bed can be verified with many tools. When fiducials are available, often 2D imaging is enough to achieve appropriate positioning and the kV-kV method is recommended. Imaging with 2.5MV can also be a good solution instead of 6MV. Without fiducials 3D images should be acquired and the recommended method is the kV-CBCT.
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Affiliation(s)
- Gábor Stelczer
- Center of Radiotherapy, National Institute of Oncology, Budapest, Hungary; Institute of Nuclear Techniques, Budapest University of Technology and Economics, Budapest, Hungary.
| | - Dóra Tatai-Szabó
- Center of Radiotherapy, National Institute of Oncology, Budapest, Hungary; Institute of Nuclear Techniques, Budapest University of Technology and Economics, Budapest, Hungary
| | - Tibor Major
- Center of Radiotherapy, National Institute of Oncology, Budapest, Hungary; Department of Oncology, Semmelweis University, Budapest, Hungary
| | - Norbert Mészáros
- Center of Radiotherapy, National Institute of Oncology, Budapest, Hungary; Department of Oncology, Semmelweis University, Budapest, Hungary
| | - Csaba Polgár
- Center of Radiotherapy, National Institute of Oncology, Budapest, Hungary; Department of Oncology, Semmelweis University, Budapest, Hungary
| | - Jenő Pálvölgyi
- Department for Oncoradiology, Aladár Petz County Teaching Hospital, Győr, Hungary
| | - Csilla Pesznyák
- Center of Radiotherapy, National Institute of Oncology, Budapest, Hungary; Institute of Nuclear Techniques, Budapest University of Technology and Economics, Budapest, Hungary
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12
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Stelczer G, Major T, Mészáros N, Polgár C, Pesznyák C. External beam accelerated partial breast irradiation: dosimetric assessment of conformal and three different intensity modulated techniques. Radiol Oncol 2019; 53:123-130. [PMID: 30661060 PMCID: PMC6411019 DOI: 10.2478/raon-2019-0001] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 11/29/2018] [Indexed: 01/20/2023] Open
Abstract
Background The aim of the study was to evaluate and compare four different external beam radiotherapy techniques of accelerated partial breast irradiation (APBI) considering target coverage, dose to organs at risk and overall plan quality. The investigated techniques were three dimensional conformal radiotherapy (3D-CRT), "step and shoot" (SS) and "sliding window" (SW) intensity-modulated radiotherapy (IMRT), intensity-modulated arc therapy (RA). Patients and methods CT scans of 40 APBI patients were selected for the study. The planning objectives were set up according to the international recommendations. Homogeneity, conformity and plan quality indices were calculated from volumetric and dosimetric parameters of target volumes and organs at risk. The total monitor units and feasibility were also investigated. Results There were no significant differences in the coverage of the target volume between the techniques. The homogeneity indices of 3D-CRT, SS, SW and RA plans were 0.068, 0.074, 0.058 and 0.081, respectively. The conformation numbers were 0.60, 0.80, 0.82 and 0.89, respectively. The V50% values of the ipsilateral breast for 3D-CRT, SS, SW and RA were 47.5%, 40.2%, 39.9% and 31.6%, respectively. The average V10% and V40% values of ipsilateral lung were 13.1%, 28.1%, 28%, 36% and 2.6%, 1.9%, 1.9%, 3%, respectively. The 3D-CRT technique provided the best heart protection, especially in the low dose region. All contralateral organs received low doses. The SW technique achieved the best plan quality index (PQI). Conclusions Good target volume coverage and tolerable dose to the organs at risk are achievable with all four techniques. Taking into account all aspects, we recommend the SW IMRT technique for APBI.
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Affiliation(s)
- Gábor Stelczer
- Center of Radiotherapy, National Institute of Oncology, Budapest, Hungary
- Institute of Nuclear Techniques, Budapest University of Technology and Economics, BudapestHungary
- Gábor Stelczer, National Institute of Oncology, Ráth György u. 7-9, 1122 Budapest, Hungary. Phone: +36 1 224 8600 3667
| | - Tibor Major
- Center of Radiotherapy, National Institute of Oncology, Budapest, Hungary
| | - Norbert Mészáros
- Center of Radiotherapy, National Institute of Oncology, Budapest, Hungary
- Department of Oncology, Semmelweis University, Budapest, Hungary
| | - Csaba Polgár
- Center of Radiotherapy, National Institute of Oncology, Budapest, Hungary
- Department of Oncology, Semmelweis University, Budapest, Hungary
| | - Csilla Pesznyák
- Center of Radiotherapy, National Institute of Oncology, Budapest, Hungary
- Institute of Nuclear Techniques, Budapest University of Technology and Economics, BudapestHungary
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13
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Bogue J, Wan J, Lavey RS, Parsai EI. Dosimetric comparison of VMAT with integrated skin flash to 3D field-in-field tangents for left breast irradiation. J Appl Clin Med Phys 2019; 20:24-29. [PMID: 30653831 PMCID: PMC6371015 DOI: 10.1002/acm2.12527] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 10/21/2018] [Accepted: 10/28/2018] [Indexed: 12/13/2022] Open
Abstract
Volumetric modulated arc therapy (VMAT) has been implemented for left breast irradiation to reduce prescription dose to the heart and improve dose homogeneity across the targeted breast. Our in-house method requires application of a bolus during the optimization process with a target outside of the body, then removing the bolus during the final calculation in order to incorporate skin flash in VMAT plans. To quantify the dosimetric trade-offs between traditional 3D field-in-field tangents and VMAT with integrated skin flash for these patients, we compared nine consecutive patients who recently received radiation to their entire left breast but not their regional lymphatics. Tangent plans used non-divergent tangents of mixed energies and VMAT plans utilized four 6 MV arcs of roughly 260°. Mean dose to the heart, contralateral lung, and contralateral breast and their volume receiving 5%, 10%, and 20% of the prescription dose were higher in all nine VMAT plans than in the static tangential beam plans. For all critical structures, the mean VMAT DVH was higher in the low-dose region and crossed the 3D field-in-field DVH between 23.13% and 34.18% of the prescription dose (984.75-1454.70 cGy). However, the volume of the contralateral breast and heart receiving the prescription dose was slightly lower in the VMAT plans, but not statistically significant. VMAT provided superior homogeneity, with a mean homogeneity index of 9.41 ± 1.64 compared to 11.05 ± 1.82 for 3D tangents. Results indicate that VMAT spares the heart, contralateral lung, and contralateral breast from prescription dose at the cost of increasing their mean and low-dose volume and delivers a more homogenous dose distribution to the breast. For these reasons, VMAT is selectively applied at the request of the physician for left breast radiation without respiratory gating to spare the heart from prescription dose in cases of poor anatomical geometry.
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Affiliation(s)
- Jonathan Bogue
- Department of Radiation Oncology, University of Toledo Medical Center, Toledo, OH, USA
| | - Jui Wan
- Department of Radiation Oncology, University of Toledo Medical Center, Toledo, OH, USA
| | | | - E Ishmael Parsai
- Department of Radiation Oncology, University of Toledo Medical Center, Toledo, OH, USA
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14
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Marrazzo L, Meattini I, Arilli C, Calusi S, Casati M, Talamonti C, Livi L, Pallotta S. Auto-planning for VMAT accelerated partial breast irradiation. Radiother Oncol 2018; 132:85-92. [PMID: 30825975 DOI: 10.1016/j.radonc.2018.11.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 11/11/2018] [Accepted: 11/13/2018] [Indexed: 10/27/2022]
Abstract
PURPOSE To evaluate the quality of accelerated partial breast irradiation (APBI) plans generated by the Auto-Planning module of a commercial treatment planning system (TPS). MATERIAL AND METHODS Twenty patients, previously planned and treated with manual planning in a TPS (manM), were re-planned using manual (manP) and automatic (AP) module of a different TPS. Plans were compared in terms of dosimetric parameters, degree of modulation, monitor units and treatment time, and by blind qualitative scoring by a physician. Dosimetric verification was evaluated in terms of γ passing rate and point dose measurements. Statistical differences were evaluated using paired two-sided Wilcoxon's signed-rank test. RESULTS A statistically significant improvement in PTV coverage was observed for AP plans compared to clinical plans, while no differences in organs at risk doses were observed. When compared to manP plans, a statistically significant improvement was observed for PTV coverage and homogeneity and for the ipsilateral breast and lung dosimetric parameters. The modulation degree was reduced with AP compared to manM treatment plans, while it was increased compared to manP treatment plans. No differences were observed in γ passing rate. Planning time was reduced from (54.5 ± 8.0) min for manM planning and (62.8 ± 15.0) min for manP planning to (9.8 ± 1.1) min for AP. In the qualitative scoring, AP plans were considered superior both to manM (10/20 cases) and manP plans (12/20 cases) with high clinical relevance. CONCLUSION Automatic planning for VMAT APBI was always at least equivalent and overall superior to manual planning.
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Affiliation(s)
- Livia Marrazzo
- Medical Physic Unit, Azienda Ospedaliero - Universitaria Careggi, Florence, Italy.
| | - Icro Meattini
- Radiation Oncology Unit, Azienda Ospedaliero - Universitaria Careggi, Florence, Italy; Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Chiara Arilli
- Medical Physic Unit, Azienda Ospedaliero - Universitaria Careggi, Florence, Italy
| | - Silvia Calusi
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Marta Casati
- Medical Physic Unit, Azienda Ospedaliero - Universitaria Careggi, Florence, Italy
| | - Cinzia Talamonti
- Medical Physic Unit, Azienda Ospedaliero - Universitaria Careggi, Florence, Italy; Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Lorenzo Livi
- Radiation Oncology Unit, Azienda Ospedaliero - Universitaria Careggi, Florence, Italy; Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Stefania Pallotta
- Medical Physic Unit, Azienda Ospedaliero - Universitaria Careggi, Florence, Italy; Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
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15
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Five-field IMRT class solutions and dosimetric planning guidelines for implementing accelerated partial breast irradiation. Pract Radiat Oncol 2018; 8:e99-e107. [DOI: 10.1016/j.prro.2017.09.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 08/29/2017] [Accepted: 09/20/2017] [Indexed: 12/25/2022]
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16
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Ono Y, Yoshimura M, Hirata K, Ono T, Hirashima H, Mukumoto N, Nakamura M, Inoue M, Hiraoka M, Mizowaki T. Dosimetric advantages afforded by a new irradiation technique, Dynamic WaveArc, used for accelerated partial breast irradiation. Phys Med 2018; 48:103-110. [PMID: 29728221 DOI: 10.1016/j.ejmp.2018.03.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 03/13/2018] [Accepted: 03/23/2018] [Indexed: 12/25/2022] Open
Abstract
PURPOSE To identify dosimetric advantages of the novel Dynamic WaveArc (DWA) technique for accelerated partial breast irradiation (APBI), compared with non-coplanar three-dimensional conformal radiotherapy (nc3D-CRT) and coplanar tangential volumetric modulated arc therapy (tVMAT) with dual arcs of 45-65°. METHODS Vero4DRT enables DWA by continuous gantry rotation and O-ring skewing with movement of the multi-leaf collimator. We compared the dose distributions of DWA, nc3D-CRT and tVMAT in 24 consecutive left-sided breast cancer patients treated with APBI (38.5 Gy in 10 fractions). The average doses and volumes to the planning target volume (PTV) and organs at risk, especially heart and left anterior descending artery (LAD) were compared among DWA, nc3D-CRT and tVMAT. RESULTS The doses and volumes to the PTVs did not differ significantly among the three plans. For the DWA plans, the mean dose to the heart was 0.2 ± 0.1 Gy, less than those of the nc3D-CRT and tVMAT plans. The D2% values of the planning organ at risk volume of the LAD were 9.3 ± 10.9%, 28.2 ± 31.9% and 20.3 ± 25.7% for DWA, nc3D-CRT and tVMAT, respectively. The V20Gy and V10Gy of the ipsilateral lung for the DWA plans were also significantly lower. CONCLUSIONS DWA allowed to find a better compromise for OAR which overlapped with the PTV. Use of the DWA for APBI improved the dose distributions compared with those of nc3D-CRT and tVMAT.
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Affiliation(s)
- Yuka Ono
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Michio Yoshimura
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan.
| | - Kimiko Hirata
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Tomohiro Ono
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Hideaki Hirashima
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Nobutaka Mukumoto
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Mitsuhiro Nakamura
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan; Division of Medical Physics, Department of Information Technology and Medical Engineering, Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, 606-8507, Japan
| | - Minoru Inoue
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Masahiro Hiraoka
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
| | - Takashi Mizowaki
- Department of Radiation Oncology and Image-applied Therapy, Graduate School of Medicine, Kyoto University, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan
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17
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Gopalakrishnan Z, Nair RK, Raghukumar P, Sarin B. Dosimetric Comparison of Treatment Plans Using Physical Wedge and Enhanced Dynamic Wedge for the Planning of Breast Radiotherapy. J Med Phys 2018; 43:46-51. [PMID: 29628633 PMCID: PMC5879823 DOI: 10.4103/jmp.jmp_40_17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The aim of this study is to compare the physical wedge (PW) with enhanced dynamic wedge (EDW) to determine the difference in the dose distribution affecting the treated breast and the contralateral breast, lungs, heart, esophagus, spine, and surrounding skin in the radiotherapy of breast cancer. Computed tomography (CT) data sets of 30 breast cancer patients were selected from the database for the study. The treatment plans which were executed with PW were re-planned with EDW without changing the beam parameters. Keeping the wedge angles same, the analytic anisotropic algorithm (AAA) with heterogeneity correction was used for dose calculation in all plans. The prescription was 50 Gy in 25 fractions. The dose- volume histogram (DVH) of the planning target volume (PTV) and critical structures of both PW and EDW plans were analyzed. The analysis showed that the maximum dose within the target volume is higher in EDW plan compared to PW plan. However the PTV conformity index (CI) remained the same in both plans. For all the critical structures, the EDW technique offered less dose compared to PW technique. The effect of volume of the contralateral breast on the dose to contralateral breast and the effect of volume of PTV breast for patients with carcinoma left breast on the dose to heart were studied and analyzed for the two wedges. No correlation between volumes and dose parameters was found for the two techniques. The number of monitor units to deliver a particular dose with EDW field is less than that of PW field due to change in wedge factor. As EDW produces less scattered dose to structures outside the treatment field, the risk of a second malignancy can be reduced with this technique.
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Affiliation(s)
| | - Raghuram K Nair
- Division of Radiation Physics, Regional Cancer Centre, Trivandrum, Kerala, India
| | - P Raghukumar
- Division of Radiation Physics, Regional Cancer Centre, Trivandrum, Kerala, India
| | - B Sarin
- Division of Radiation Physics, Regional Cancer Centre, Trivandrum, Kerala, India
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18
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Charaghvandi RK, Yoo S, van Asselen B, Rodrigues A, van den Bongard DHJG, Horton JK. Treatment constraints for single dose external beam preoperative partial breast irradiation in early-stage breast cancer. Clin Transl Radiat Oncol 2017; 6:7-14. [PMID: 29594217 PMCID: PMC5862640 DOI: 10.1016/j.ctro.2017.06.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 06/14/2017] [Indexed: 12/25/2022] Open
Abstract
Background Following breast-conserving surgery and post-operative 3D-conformal accelerated partial breast irradiation (APBI), suboptimal cosmetic results have been reported. Preoperative radiation delivery to the intact tumor enables better target visualization and treatment volume reduction. Single dose preoperative APBI has the potential to improve toxicity profiles, reduce treatment burden and enable in vivo exploration of breast cancer radiogenomics. Purpose Develop practical guidelines for single dose external beam preoperative APBI. Methods Recommended dose constraints were derived from pooled dosimetry estimates from 2 clinical trials. In an American dose escalation trial, a uniform 15, 18 or 21 Gy dose has previously been evaluated for non-lobular cT1N0 or low/intermediate grade DCIS <2 cm in prone position (n = 32). In the Netherlands, the feasibility of ablative APBI (20 Gy to GTV, 15 Gy to CTV) to non-lobular cT1N0 in supine position, is currently being explored (n = 15). The dosimetric adherence to the developed constraints was evaluated in new APBI plans with a 21 Gy uniform dose but an extended CTV margin (n = 32). Results Dosimetric data pooling enabled the development of practical guidelines for single dose preoperative APBI. Conclusion The developed guidelines will allow further explorations in the promising field of single dose preoperative external beam APBI for breast cancer treatment.
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Affiliation(s)
- Ramona K Charaghvandi
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Sua Yoo
- Department of Radiation Oncology, Duke Cancer Center, Durham, USA
| | - Bram van Asselen
- Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Anna Rodrigues
- Department of Radiation Oncology, Duke Cancer Center, Durham, USA
| | | | - Janet K Horton
- Department of Radiation Oncology, Duke Cancer Center, Durham, USA
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Buwenge M, Cammelli S, Ammendolia I, Tolento G, Zamagni A, Arcelli A, Macchia G, Deodato F, Cilla S, Morganti AG. Intensity modulated radiation therapy for breast cancer: current perspectives. BREAST CANCER-TARGETS AND THERAPY 2017; 9:121-126. [PMID: 28293119 PMCID: PMC5345691 DOI: 10.2147/bctt.s113025] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Background Owing to highly conformed dose distribution, intensity modulated radiation therapy (IMRT) has the potential to improve treatment results of radiotherapy (RT). Postoperative RT is a standard adjuvant treatment in conservative treatment of breast cancer (BC). The aim of this review is to analyze available evidence from randomized controlled trials (RCTs) on IMRT in BC, particularly in terms of reduction of side effects. Methods A literature search of the bibliographic database PubMed, from January 1990 through November 2016, was performed. Only RCTs published in English were included. Results Ten articles reporting data from 5 RCTs fulfilled the selection criteria and were included in our review. Three out of 5 studies enrolled only selected patients in terms of increased risk of toxicity. Three studies compared IMRT with standard tangential RT. One study compared the results of IMRT in the supine versus the prone position, and one study compared standard treatment with accelerated partial breast IMRT. Three studies reported reduced acute and/or late toxicity using IMRT compared with standard RT. No study reported improved quality of life. Conclusion IMRT seems able to reduce toxicity in selected patients treated with postoperative RT for BC. Further analyses are needed to better define patients who are candidates for this treatment modality.
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Affiliation(s)
- Milly Buwenge
- Department of Experimental, Diagnostic and Specialty Medicine - DIMES, Radiation Oncology Center, University of Bologna, S.Orsola-Malpighi Hospital
| | - Silvia Cammelli
- Department of Experimental, Diagnostic and Specialty Medicine - DIMES, Radiation Oncology Center, University of Bologna, S.Orsola-Malpighi Hospital
| | - Ilario Ammendolia
- Department of Experimental, Diagnostic and Specialty Medicine - DIMES, Radiation Oncology Center, University of Bologna, S.Orsola-Malpighi Hospital
| | - Giorgio Tolento
- Department of Experimental, Diagnostic and Specialty Medicine - DIMES, Radiation Oncology Center, University of Bologna, S.Orsola-Malpighi Hospital
| | - Alice Zamagni
- Department of Experimental, Diagnostic and Specialty Medicine - DIMES, Radiation Oncology Center, University of Bologna, S.Orsola-Malpighi Hospital
| | | | | | | | - Savino Cilla
- Medical Physics Unit, Research and Care Foundation 'Giovanni Paolo II,' Catholic University of Sacred Heart, Campobasso, Italy
| | - Alessio G Morganti
- Department of Experimental, Diagnostic and Specialty Medicine - DIMES, Radiation Oncology Center, University of Bologna, S.Orsola-Malpighi Hospital
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Major T, Stelczer G, Pesznyák C, Mészáros N, Polgár C. Multicatheter interstitial brachytherapy versus intensity modulated external beam therapy for accelerated partial breast irradiation: A comparative treatment planning study with respect to dosimetry of organs at risk. Radiother Oncol 2017; 122:17-23. [DOI: 10.1016/j.radonc.2016.08.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 08/01/2016] [Accepted: 08/01/2016] [Indexed: 11/16/2022]
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21
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Chand-Fouché ME, Lam Cham Kee D, Gautier M, Hannoun-Levi JM. Technique d’irradiation partielle du sein : radiothérapie externe et curiethérapie. Cancer Radiother 2016; 20:587-94. [DOI: 10.1016/j.canrad.2016.07.087] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Revised: 07/12/2016] [Accepted: 07/19/2016] [Indexed: 10/21/2022]
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22
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Meyer P, Niederst C, Scius M, Jarnet D, Dehaynin N, Gantier M, Waissi W, Poulin N, Karamanoukian D. Is the lack of respiratory gating prejudicial for left breast TomoDirect treatments? Phys Med 2016; 32:644-50. [DOI: 10.1016/j.ejmp.2016.04.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 04/01/2016] [Accepted: 04/04/2016] [Indexed: 10/21/2022] Open
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23
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Lakosi F, Gulyban A, Simoni SBM, Nguyen PV, Cucchiaro S, Seidel L, Janvary L, Nicolas S, Vavassis P, Coucke P. The Influence of Treatment Position (Prone vs. Supine) on Clip Displacement, Seroma, Tumor Bed and Partial Breast Target Volumes: Comparative Study. Pathol Oncol Res 2015; 22:493-500. [PMID: 26676979 DOI: 10.1007/s12253-015-0028-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Accepted: 12/10/2015] [Indexed: 10/22/2022]
Abstract
To analyse the displacement of surgical clips in prone (Pr) position and assess the consequences on target volumes and integral dose of partial breast irradiation (PBI). 30 post-lumpectomy breast cancer patients underwent CT imaging in supine (Su) and Pr. Clip displacements were measured by the distances from the clips to a common fix bony reference point. On each dataset, the tumour bed (TB = clips ± seroma), clinical target volume (CTV = TB + 1.5 cm) and planning target volumes (PTV = CTV + 1 cm) for PBI were determined and the volume pairs were compared. Furthermore estimation of integral dose ratio (IDR) within the breast from tangential treatment was performed as the ratio of the irradiated breast volume and the volume encompassing all clips. Clips close to the chest wall (CW) in Su showed significantly less displacement in Pr. The mean volumes of seroma, CTV and PTV were significantly higher in Pr than in Su. The PTV volume difference (Pr-Su) was significantly higher in patients with presence of seroma, deep clips and TB location in the superior-internal-quadrant (SIQ) and at the junction of superior quadrants (jSQ). In a multivariate analysis two factors remained significant: seroma and TB localization in SIQ-jSQ. The IDR was significantly larger in Su than in Pr (7.6 vs. 4.1 p < 0.01). Clip displacements varied considerably with respect to their relative position to the CW. In selected patients Pr position potentially leads to a significant increase in target volumes of PBI. Tangential beam arrangement for PBI should be avoided, not only in Su but in Pr as well in case of clip-based target volume definition.
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Affiliation(s)
- Ferenc Lakosi
- Department of Radiation Oncology, University Hospital of Liège, Domain University of Sart Tilman, B.35, B-4000, Liège 1, Belgium.
| | - Akos Gulyban
- Department of Radiation Oncology, University Hospital of Liège, Domain University of Sart Tilman, B.35, B-4000, Liège 1, Belgium
| | - Selma Ben-Mustapha Simoni
- Department of Radiation Oncology, University Hospital of Liège, Domain University of Sart Tilman, B.35, B-4000, Liège 1, Belgium
| | - Paul Viet Nguyen
- Department of Radiation Oncology, University Hospital of Liège, Domain University of Sart Tilman, B.35, B-4000, Liège 1, Belgium
| | - Séverine Cucchiaro
- Department of Radiation Oncology, University Hospital of Liège, Domain University of Sart Tilman, B.35, B-4000, Liège 1, Belgium
| | - Laurence Seidel
- Department of Biostatistics, University Hospital of Liège, Liège, Belgium
| | - Levente Janvary
- Department of Radiation Oncology, Debrecen University, Debrecen, Hungary
| | - Sophie Nicolas
- Department of Radiation Oncology, University Hospital of Liège, Domain University of Sart Tilman, B.35, B-4000, Liège 1, Belgium
| | - Peter Vavassis
- Department of Radiation Oncology, Hôpital Maisonneuve-Rosemont, Montreal, Québec, Canada
| | - Philippe Coucke
- Department of Radiation Oncology, University Hospital of Liège, Domain University of Sart Tilman, B.35, B-4000, Liège 1, Belgium
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24
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Charaghvandi RK, den Hartogh MD, van Ommen AMLN, de Vries WJH, Scholten V, Moerland MA, Philippens MEP, Schokker RI, van Vulpen M, van Asselen B, van den Bongard DHJG. MRI-guided single fraction ablative radiotherapy for early-stage breast cancer: a brachytherapy versus volumetric modulated arc therapy dosimetry study. Radiother Oncol 2015; 117:477-82. [PMID: 26438972 DOI: 10.1016/j.radonc.2015.09.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 09/01/2015] [Accepted: 09/20/2015] [Indexed: 12/25/2022]
Abstract
BACKGROUND AND PURPOSE A radiosurgical treatment approach for early-stage breast cancer has the potential to minimize the patient's treatment burden. The dosimetric feasibility for single fraction ablative radiotherapy was evaluated by comparing volumetric modulated arc therapy (VMAT) with an interstitial multicatheter brachytherapy (IMB) approach. METHODS AND MATERIALS The tumors of 20 patients with early-stage breast cancer were delineated on a preoperative contrast-enhanced planning CT-scan, co-registered with a contrast-enhanced magnetic resonance imaging (MRI), both in radiotherapy supine position. A dose of 15 Gy was prescribed to the planned target volume of the clinical target volume (PTVCTV), and 20 Gy integrated boost to the PTV of the gross tumor volume (PTVGTV). Treatment plans for IMB and VMAT were optimized for adequate target volume coverage and minimal organs at risk (OAR) dose. RESULTS The median PTVGTV/CTV receiving at least 95% of the prescribed dose was ⩾99% with both techniques. The median PTVCTV unintentionally receiving 95% of the prescribed PTVGTV dose was 65.4% and 4.3% with IMB and VMAT, respectively. OAR doses were comparable with both techniques. CONCLUSION MRI-guided single fraction radiotherapy with an integrated ablative boost to the GTV is dosimetrically feasible with both techniques. We perceive IMB less suitable for clinical implementation due to PTVCTV overdosage. Future studies have to confirm the clinical feasibility of the single fraction ablative approach.
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Affiliation(s)
| | | | | | | | - Vincent Scholten
- Department of Radiotherapy, University Medical Center Utrecht, The Netherlands
| | - Marinus A Moerland
- Department of Radiotherapy, University Medical Center Utrecht, The Netherlands
| | | | - Rogier I Schokker
- Department of Radiotherapy, University Medical Center Utrecht, The Netherlands
| | - Marco van Vulpen
- Department of Radiotherapy, University Medical Center Utrecht, The Netherlands
| | - Bram van Asselen
- Department of Radiotherapy, University Medical Center Utrecht, The Netherlands
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Chung MJ, Kim SH, Lee JH, Suh YJ. A Dosimetric Comparative Analysis of TomoDirect and Three-Dimensional Conformal Radiotherapy in Early Breast Cancer. J Breast Cancer 2015; 18:57-62. [PMID: 25834612 PMCID: PMC4381124 DOI: 10.4048/jbc.2015.18.1.57] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 02/24/2015] [Indexed: 11/30/2022] Open
Abstract
PURPOSE The purpose of this study is to compare dosimetric parameters of intensity-modulated mode of TomoDirect and three-dimensional conformal radiotherapy (3D-CRT) in patients with early breast cancer. METHODS TomoDirect and 3D-CRT planning were carried out for 26 patients with early breast cancer who had received breast-conserving surgery. A total of 50.4 Gy in 28 fractions were prescribed to the planning target volume. The organs at risk (OAR) such as lung and heart were contoured. Planning target volume (PTV) dose coverage, radiation conformity index (RCI), radical dose homogeneity index (rDHI), and irradiation dose of organs at risk were compared between TomoDirect and 3D-CRT planning. RESULTS The mean PTV dose (51.65±0.37 Gy) and V47.8 (100%) in TomoDirect were significantly higher than the mean PTV dose (50.88±0.65 Gy) and V47.8 (89.23%±0.06%) in 3D-CRT (all, p<0.001). The RCI value in TomoDirect was significantly better than that in 3D-CRT (1.00 vs. 1.13, p<0.001). However, the rDHI value in TomoDirect was not significantly better than that in 3D-CRT (0.72 vs. 0.67, p=0.056). The mean lung dose and V10, V20, V30, and V40 values of ipsilateral lung in TomoDirect were significantly lower than those in 3D-CRT (all, p<0.05). There is no significant difference in the V10, V20, V30, and V40 values of heart between TomoDirect and 3D-CRT. And the mean dose for heart in TomoDirect was marginally lower than that in 3D-CRT (1.05 Gy vs. 1.62 Gy, p=0.085). The mean dose for left anterior descending coronary artery in left breast cancer was significantly lower in TomoDirect than in 3D-CRT (7.2 Gy vs. 12.1 Gy, p<0.001). CONCLUSION Compared to 3D-CRT, TomoDirect could result in favorable target coverage while reducing the irradiation dose of the ipsilateral lung for patients with early breast cancer.
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Affiliation(s)
- Mi Joo Chung
- Department of Radiation Oncology, St. Vincent's Hospital, The Catholic University of Korea College of Medicine, Suwon, Korea
| | - Sung Hwan Kim
- Department of Radiation Oncology, St. Vincent's Hospital, The Catholic University of Korea College of Medicine, Suwon, Korea
| | - Jong Hoon Lee
- Department of Radiation Oncology, St. Vincent's Hospital, The Catholic University of Korea College of Medicine, Suwon, Korea
| | - Young Jin Suh
- Department of Surgery, St. Vincent's Hospital, The Catholic University of Korea College of Medicine, Suwon, Korea
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26
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Fekete G, Újhidy D, Együd Z, Kiscsatári L, Marosi G, Kahán Z, Varga Z. Partial breast radiotherapy with simple teletherapy techniques. Med Dosim 2015; 40:290-5. [DOI: 10.1016/j.meddos.2015.03.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 02/16/2015] [Accepted: 03/19/2015] [Indexed: 01/13/2023]
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