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Maria P, Theodoros S, Anna Z, Michael P, Vassilis K, Kalliopi P. Synchronous bilateral chest wall irradiation with regional nodal irradiation: A literature review of techniques and a case study. Phys Med 2022; 101:50-61. [PMID: 35961182 DOI: 10.1016/j.ejmp.2022.07.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 06/03/2022] [Accepted: 07/26/2022] [Indexed: 10/15/2022] Open
Abstract
The optimal radiotherapy technique for patients requiring both breasts or chest walls simultaneous irradiation with or without regional nodal irradiation is currently under investigation. In the last decade several publications present case reports and case series of patients treated with adjuvant radiotherapy in both breasts or chest walls for synchronous bilateral breast cancer (SBBC) with modern radiotherapy techniques. This article presents a systematic review of relevant literature as well as a case report of a SBBC patient who received bilateral chest wall radiotherapy with regional nodal irradiation at our institution with Truebeam - Edge Linear Accelerator. Solid evidence is provided that the practice of avoiding adjuvant radiotherapy in SBBC out of fear of toxicity with older radiotherapy techniques is outdated. Modern techniques can safely and effectively deliver treatment to patients requiring both sides irradiation and even in mastectomy patients in need of regional nodal irradiation.
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Affiliation(s)
- Protopapa Maria
- Mediterraneo General Hospital, Radiation Oncology and Radiosurgery Department, Ilias st. 8-12, Glyfada, Greece.
| | - Stroumbinis Theodoros
- Mediterraneo General Hospital, Radiation Oncology and Radiosurgery Department, Ilias st. 8-12, Glyfada, Greece
| | - Zygogianni Anna
- National and Kapodistrian University of Athens, Medical School, 1st Dpt of Radiology, RT Unit, Aretaieion University Hospital, Greece
| | - Psarras Michael
- Mediterraneo General Hospital, Radiation Oncology and Radiosurgery Department, Ilias st. 8-12, Glyfada, Greece
| | - Kouloulias Vassilis
- National and Kapodistrian University of Athens, Medical School, 2nd Dpt of Radiology, RT Unit, ATTIKON University Hospital, Greece
| | - Platoni Kalliopi
- National and Kapodistrian University of Athens, Medical School, 2nd Dpt of Radiology, RT Unit, ATTIKON University Hospital, Greece; National and Kapodistrian University of Athens, Medical School, 2nd Dpt of Radiology, Medical Physics Unit, ATTIKON University Hospital, Greece
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Qian C, Liang Y, Yang M, Bao SN, Bai JL, Yin YM, Yu H. Effect of breast-conserving surgery plus radiotherapy versus mastectomy on breast cancer-specific survival for early-stage contralateral breast cancer. Gland Surg 2021; 10:2978-2996. [PMID: 34804885 DOI: 10.21037/gs-21-413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 09/02/2021] [Indexed: 11/06/2022]
Abstract
Background Breast-conserving surgery followed by radiotherapy is recommended in most women with early-stage unilateral breast cancer. However, its role in contralateral breast cancer (CBC) patients remains unclear. This retrospective study aimed to evaluate the breast cancer-specific survival (BCSS) outcomes after breast-conserving surgery plus radiotherapy compared with mastectomy in women with early-stage (T1-2N0-1M0) CBC. Methods Data were extracted from the Surveillance, Epidemiology, and End Results database. BCSS was analyzed using the log-rank method, competing risks regression model, and propensity score matching method. Results A total of 9,336 early-stage CBC patients were included. After multivariable adjustment, no significant difference in BCSS was found between early-stage CBC patients undergoing breast-conserving surgery plus radiotherapy and those undergoing mastectomy [hazard ratio (HR) 1.11, 95% confidence interval (CI): 0.90-1.37, P=0.329]. BCSS was similar in both treatment groups and in the subgroups stratified by age at first primary breast cancer or CBC diagnosis (≤50, 51-60, and >60 years), time interval between cancers (<0.25, 0.25-4, 5-9, and ≤10 years), stage of first primary breast cancer, T classification of CBC, histology and hormone receptors status of both cancers (all P>0.05). Among patients with N1 disease at CBC diagnosis, breast-conserving surgery plus radiotherapy was associated with a boundary significantly improved BCSS (HR 1.45, 95% CI: 1.00-2.12, P=0.050). Among patients who underwent breast-conserving surgery for first primary cancer, bilateral mastectomy for contralateral cancer did not improve BCSS compared with breast-conserving surgery plus radiotherapy (P>0.05). There was no significant difference in BCSS between breast-conserving surgery plus radiotherapy and mastectomy plus radiotherapy (P>0.05). Stable results were obtained after propensity score matching. Conclusions Breast-conserving surgery plus radiotherapy did not significantly influence BCSS outcomes of patients with early-stage CBC. Bilateral mastectomy and mastectomy plus radiotherapy did not confer a survival advantage over breast-conserving surgery plus radiotherapy in these patients. Future prospective studies are necessary to expand on these results.
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Affiliation(s)
- Chao Qian
- Department of General Surgery, Sir Run Run Hospital, Nanjing Medical University, Nanjing, China
| | - Yan Liang
- Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Min Yang
- Department of Biostatistics, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Sheng-Nan Bao
- Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Jian-Ling Bai
- Department of Biostatistics, School of Public Health, Nanjing Medical University, Nanjing, China
| | - Yong-Mei Yin
- Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Hao Yu
- Department of Biostatistics, School of Public Health, Nanjing Medical University, Nanjing, China
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Lin Y, Shueng P, Lin H, Tien H, Lai L. An efficient treatment planning approach to reduce the critical organ dose in volumetric modulated arc therapy for synchronous bilateral breast cancer patients. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2020.108957] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Farooqi AS, Sun TL, Thang S, Shaitelman SF. Treatment of bilateral breast cancer and regional nodes using an opposed lateral beam arrangement. Pract Radiat Oncol 2017; 7:e385-e389. [PMID: 28867548 DOI: 10.1016/j.prro.2017.07.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 06/24/2017] [Accepted: 07/01/2017] [Indexed: 11/16/2022]
Affiliation(s)
- Ahsan S Farooqi
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Tzouh-Liang Sun
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Sandy Thang
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Simona F Shaitelman
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
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Tamilarasu S, Saminathan M, Sharma SK, P A, Dewan A. Treatment Planning With Unflattened as Compared to Flattened
Beams for Bilateral Carcinoma of the Breast. Asian Pac J Cancer Prev 2017; 18:1377-1381. [PMID: 28612590 PMCID: PMC5555550 DOI: 10.22034/apjcp.2017.18.5.1377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Aim: To evaluate the plan quality of 6MV unflattened (UFB) and flattened beam (FB) photon energy using AAA dose calculation algorithms for volumetric arc therapy. Materials and Methods: Plans were generated for bilateral carcinoma of breast and the dose prescribed was 50.4Gy in 28 fractions. Two different plans were made for each patient using 6MV FB and 6MV UFB. Dose calculations were performed on an AAA dose calculation algorithm. Plans were generated on Eclipse TPS and were capable of being delivered with a true beam STx linear accelerator. The homogeneity index (HI), conformity index (CI), normal tissue integral dose (NTID), and effect of low dose volume on normal tissue and monitor units (MU) were noted. Results: All the plans were clinically acceptable. The HI and CI of 6MV UF rapid arc (RA) plans were higher than with the 6MV FB plan (1.16±0.05 and 0.12±0.00 respectively). There was no appreciable difference observed in Organ at risk (OAR) doses. The mean NTID and low dose volume were significantly low with 6MV RA UFB as compared to FB. 6MV RA UFB required a 35% higher MU than with the 6MV RA plan (p<0.05). Conclusion: RA plans generated with UFB on Eclipse TPS achieved target volume coverage and preserved OAR’s essentially similar to 6MV RA FB plans. However RA plans generated in Varian Eclipse of UFB were superior with respect to mean NTID and low dose volumes in normal tissue.
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Affiliation(s)
- Suresh Tamilarasu
- Department of Radiotherapy, Rajiv Gandhi Cancer Institute and Research Centre, Rohini, New Delhi, India
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Sejdinaj F, Yang W, Zhu W, Zhang H. Breast-conserving therapy: An alternative to optimal cosmetic outcome and comparable prognosis in synchronous bilateral breast cancer. SURGICAL PRACTICE 2017. [DOI: 10.1111/1744-1633.12246] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Fabjola Sejdinaj
- Department of General Surgery, Zhongshan Hospital; Fudan University; Shanghai China
| | - Weige Yang
- Department of General Surgery, Zhongshan Hospital; Fudan University; Shanghai China
| | - Wei Zhu
- Department of General Surgery, Zhongshan Hospital; Fudan University; Shanghai China
| | - Hongwei Zhang
- Department of General Surgery, Zhongshan Hospital; Fudan University; Shanghai China
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Fiorentino A, Mazzola R, Naccarato S, Giaj-Levra N, Fersino S, Sicignano G, Tebano U, Ricchetti F, Ruggieri R, Alongi F. Synchronous bilateral breast cancer irradiation: clinical and dosimetrical issues using volumetric modulated arc therapy and simultaneous integrated boost. Radiol Med 2017; 122:464-471. [PMID: 28224401 DOI: 10.1007/s11547-017-0741-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 02/06/2017] [Indexed: 11/30/2022]
Abstract
OBJECTIVES The aim of the present retrospective analysis was to evaluate dosimetric parameters, feasibility and outcome for Synchronous Bilateral Breast Cancer (SBBC) patients treated with adjuvant radiotherapy (RT) by Volumetric Modulated Arc Therapy (VMAT). METHODS From September 2011 to April 2016, 1100 Breast Cancer (BC) patients were referred to our institution to receive adjuvant breast RT, and those with SBBC were selected for the present analysis. A total of 16 patients were identified. A total dose of 50 Gy in 25 fractions was prescribed to the Planning Target Volume of the whole bilateral breast (PTVBN) with or without the supraclavicular and infraclavicular nodes, while a total dose of 60 Gy in 25 fractions was prescribed to the surgical bed (PTVboost). Several V xGy and Dx% parameters were analyzed for the PTVs, together with Conformity and Homogeneity indexes (CI, HI), and for the critical Organs at risk (OARs), lungs and heart first. RESULTS With a median follow-up of 24 months, no acute or late side effects more than grade 2 were observed. All patients are alive without any sign of disease. For target dose coverage, our observed inter-patients averages (±1 sd) were V 95% Dp = 96.7 ± 1.6% (96.3 ± 1.8%) to the left (right) PTVBN, V 95% Dp = 98.6 ± 2.7% (99.4 ± 0.9%) to the left (right) PTVboost, and D 2% = 64.4 ± 1.8 Gy (65.0 ± 2.0 Gy) to the left (right) PTVboost, respectively. With regard to the heart, the inter-patient average of D mean was 8.3 ± 3.3 Gy. For the lungs, the inter-patient average of D mean, V 5 Gy and V 20 Gy were 11.8 ± 2.3 Gy, 78.9 ± 15.3% and 15.7 ± 5%, respectively. CONCLUSIONS The present retrospective analysis showed the feasibility, tolerability and safety of VMAT in the treatment of SBBC patients. Further studies are necessary to confirm these preliminary data.
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Affiliation(s)
- Alba Fiorentino
- Radiation Oncology, Sacro Cuore Don Calabria Cancer Care Center, via Don Sempreboni 5, 37034, Negrar, Verona, Italy
| | - Rosario Mazzola
- Radiation Oncology, Sacro Cuore Don Calabria Cancer Care Center, via Don Sempreboni 5, 37034, Negrar, Verona, Italy.
| | - Stefania Naccarato
- Radiation Oncology, Sacro Cuore Don Calabria Cancer Care Center, via Don Sempreboni 5, 37034, Negrar, Verona, Italy
| | - Niccolò Giaj-Levra
- Radiation Oncology, Sacro Cuore Don Calabria Cancer Care Center, via Don Sempreboni 5, 37034, Negrar, Verona, Italy
| | - Sergio Fersino
- Radiation Oncology, Sacro Cuore Don Calabria Cancer Care Center, via Don Sempreboni 5, 37034, Negrar, Verona, Italy
| | - Gianluisa Sicignano
- Radiation Oncology, Sacro Cuore Don Calabria Cancer Care Center, via Don Sempreboni 5, 37034, Negrar, Verona, Italy
| | - Umberto Tebano
- Radiation Oncology School, University of Padua, Padua, Italy
| | - Francesco Ricchetti
- Radiation Oncology, Sacro Cuore Don Calabria Cancer Care Center, via Don Sempreboni 5, 37034, Negrar, Verona, Italy
| | - Ruggero Ruggieri
- Radiation Oncology, Sacro Cuore Don Calabria Cancer Care Center, via Don Sempreboni 5, 37034, Negrar, Verona, Italy
| | - Filippo Alongi
- Radiation Oncology, Sacro Cuore Don Calabria Cancer Care Center, via Don Sempreboni 5, 37034, Negrar, Verona, Italy
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Balaji Subramanian S, Balaji K, Thirunavukarasu M, Premkumar S. Bilateral Breast Irradiation Using Hybrid Volumetric Modulated Arc Therapy (h-VMAT) Technique: A Planning Case Report. Cureus 2016; 8:e914. [PMID: 28083458 PMCID: PMC5215817 DOI: 10.7759/cureus.914] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The purpose of this planning case report is to share the perceived dosimetric benefits of innovative hybrid volumetric modulated arc therapy (h-VMAT) for bilateral breast cancer radiotherapy in two patients with synchronous bilateral breast cancer. Two patients with early bilateral breast cancer after breast conservation surgery and adjuvant chemotherapy were planned for bilateral breast radiotherapy. On the planning computed tomography (CT) dataset, bilateral breast planning treatment volume (PTV) and organs at risk (OARs) were delineated using standard guidelines. Using the same structure set, volumetric modulated arc therapy (VMAT) and h-VMAT plans were generated and compared dosimetrically. The h-VMAT showed comparable target coverage, conformity and homogeneity while sparing of both lungs and heart were better. The dose to heart was reduced with h-VMAT, with a V25Gy and V5Gy of 3.2 & 22.3% for h-VMAT versus 11.6 & 84.9% for the VMAT plan. Similarly, the dose to the total lung was better in h-VMAT with a V20Gy and V5Gy of 12.1 & 46.2 versus 19.9 & 83.3% for VMAT. Overall the results indicate a better sparing of lung and heart at low doses with h-VMAT. Long-term clinical follow-up will give us more insight about the dosimetric benefits of these innovative techniques.
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Padmanabhan N, Subramanyan A, Radhakrishna S. Synchronous Bilateral Breast Cancers. J Clin Diagn Res 2015; 9:XC05-XC08. [PMID: 26500995 DOI: 10.7860/jcdr/2015/14880.6511] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Accepted: 07/20/2015] [Indexed: 11/24/2022]
Abstract
BACKGROUND Bilateral breast cancer (BBC) is not an uncommon entity in contemporary breast clinics. Improved life expectancy after breast cancer treatment and routine use of contra-lateral breast mammography has led to increased incidence of BBC. Our study objective was to define the epidemiological and tumour characteristics of BBC in India. MATERIALS AND METHODS A total of 1251 breast cancer patients were treated during the period January 2007 to March 2015 and 30 patients were found to have BBC who constituted the study population (60 tumour samples). Synchronous bilateral breast cancers (SBC) was defined as two tumours diagnosed within an interval of 6 months and a second cancer diagnosed after 6 months was labelled as metachronous breast cancer (MBC). Analyses of patient and tumour characteristics were done in this prospective data base of BBC patients. RESULTS Median patient age was 66 years (range 39-85). Majority of the patients had SBC (n=28) and in 12 patients the second tumour was clinically occult and detected only by mammography of the contra-lateral breast. The second tumour was found at lower tumour size compared to the first in 73% of cases and was negative for axillary metastasis in 80% of cases (24/30). Infiltrating ductal carcinoma was the commonest histological type (n=51) and majority of the tumours were ER/PR positive (50/60). Her2 was overexpressed in 13 tumours (21%). Over 70% (22/30) of patients had similar histology in both breasts and amongst them grade concordance was present in about 69% (15/22) of patients. Concordance rates of ER, PR and Her2 statuses were 83%, 80% and 90% respectively. Bilateral mastectomy was the commonest surgery performed in 80% of the patients followed by bilateral breast conservation in 13%. At the end of study period, 26 patients were alive and disease free. Median survival was 29 months (range 3-86 months). CONCLUSION In most patients with BBC, the second tumour is identified at an early stage than index tumours supporting the importance of contralateral breast cancer screening at the time of primary diagnosis and during follow-up. BBC occurs more frequently in old age group and majority of these tumours are estrogen dependent. There is good pathological concordance between the index tumour and the contralateral breast cancer.
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Affiliation(s)
- Naveen Padmanabhan
- Registrar, Department of Surgical Oncology, Apollo Speciality Hospitals , Chennai-35, India
| | - Annapurneswari Subramanyan
- Chief of Surgical Pathology, Department of Surgical Pathology, Apollo Speciality Hospitals , Chennai-35, India
| | - Selvi Radhakrishna
- Senior Consultant, Department of Breast surgery and Oncoplastic Breast surgeon, Apollo Speciality Hospitals , Chennai-35, India
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Seppälä J, Heikkilä J, Myllyoja K, Koskela K. Volumetric modulated arc therapy for synchronous bilateral whole breast irradiation - A case study. Rep Pract Oncol Radiother 2015; 20:398-402. [PMID: 26549999 DOI: 10.1016/j.rpor.2015.05.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 02/13/2015] [Accepted: 05/24/2015] [Indexed: 01/08/2023] Open
Abstract
PURPOSE The treatment planning of bilateral breast irradiation (BBI) is a challenging task. The overlapping of tangential fields is usually unavoidable without compromising the target coverage. The purpose of this study was to investigate the technical feasibility and benefits of a single isocentre volumetric modulated arc therapy (VMAT) in BBI. METHODS AND MATERIALS Two women with bilateral breast cancer were included in this case study. The first patient (Pat#1) underwent a bilateral breast-conserving surgery and sentinel lymph node biopsy. The second patient (Pat#2) underwent a bilateral ablation and axillary lymph node dissection. Planning target volumes (PTV) and organs at risk were delineated on CT images. VMAT plans were created with four (two for both sides, Pat#1) or two (one for each breast, Pat#2) separate VMAT fields. Subsequently, traditional tangential field plans were generated for each patient and the dosimetric parameters were compared. RESULTS The treatment times of the patients with VMAT were less than 15 min with daily CBCT imaging. When compared to the standard tangential field technique, the VMAT plans improved the PTV dose coverage and dose homogeneity with improved sparing of lungs and heart. With traditional field arrangement, the overlapping of the tangential fields was inevitable without significantly compromising the target coverage, whereas with VMAT the hotspots were avoided. The patients were treated with the VMAT technique and no acute skin toxicity was observed with either of the patients. CONCLUSIONS A single isocentre VMAT technique has been implemented clinically for BBI. With the VMAT techniques, the dose delivery was quick and the hotspots in the field overlapping areas were avoided. The PTV dose coverage was superior in VMAT plans when compared with conventional tangential technique plans.
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Affiliation(s)
- Jan Seppälä
- Cancer Center, Kuopio University Hospital, Kuopio, Finland
| | - Janne Heikkilä
- Cancer Center, Kuopio University Hospital, Kuopio, Finland
| | - Kimmo Myllyoja
- Cancer Center, Kuopio University Hospital, Kuopio, Finland
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Wadasadawala T, Visariya B, Sarin R, Upreti RR, Paul S, Phurailatpam R. Use of tomotherapy in treatment of synchronous bilateral breast cancer: dosimetric comparison study. Br J Radiol 2015; 88:20140612. [PMID: 25605345 DOI: 10.1259/bjr.20140612] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE Synchronous malignancy in both breasts is a rare incidence. The present study aims at dosimetric comparison of conventional bitangential radiotherapy (RT) technique with conventional [field-in-field (FIF)] and rotational [Helical TomoTherapy(®) and TomoDirect™ (TD); Accuray Inc., Sunnyvale, CA] intensity-modulated RT for patients with synchronous bilateral breast cancer (SBBC). METHODS CT data sets of 10 patients with SBBC were selected for the present study. RT was planned for all patients on both sides to whole breast and/or chest wall using the above-mentioned techniques. Six females with breast conservation on at least one side also had a composite plan along with tumour bed (TB) boost using sequential electrons for bitangential and FIF techniques or sequential helical tomotherapy (HT) boost (for TD) or simultaneous integrated boost (SIB) for HT. RESULTS All techniques produced acceptable target coverage. The hotspot was significantly lower with FIF technique and HT but higher with TD. For the organs at risk doses, HT resulted in significant reduction of the higher dose volumes. Similarly, TD resulted in significant reduction of the mean dose to the heart and total lung by reducing the lower dose volumes. All techniques of delivering boost to the TB were comparable in terms of target coverage. HT-SIB markedly reduced mean doses to the total lung and heart by specifically lowering the higher dose volumes. CONCLUSION This study demonstrates the cardiac and pulmonary sparing ability of tomotherapy in the setting of SBBC. ADVANCES IN KNOWLEDGE This is the first study demonstrating feasibility of treatment of SBBC using tomotherapy.
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Affiliation(s)
- T Wadasadawala
- 1 Department of Radiation Oncology, Tata Memorial Hospital, Mumbai, India
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Qin S, Chen T, Wang L, Tu Y, Yue N, Zhou J. Angular Dependence of the MOSFET Dosimeter and its Impact on In vivo Surface Dose Measurement in Breast Cancer Treatment. Technol Cancer Res Treat 2014; 13:345-52. [PMID: 24206205 DOI: 10.7785/tcrt.2012.500382] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The focus of this study is the angular dependence of two types of Metal Oxide Semiconductor Field Effect Transistor (MOSFET) dosimeters (MOSFET20 and OneDose/OneDosePlus) when used for surface dose measurements. External beam radiationat different gantry angles were delivered to a cubic solid water phantom with a MOSFET placed on the top surface at CAX. The long axis of the MOSFET was oriented along the gantry axis of rotation, with the dosimeter (bubble side) facing the radiation source. MOSFET-measured surface doses were compared against calibrated radiochromic film readings. It was found that both types of MOSFET dosimeters exhibited larger than previously reported angular dependence when measuring surface dose in beams at large oblique angles. For the MOSFET20 dosimeter the measured surface dose deviation against film readings was as high as 17% when the incident angle was 72 degrees to the norm of the phantom surface. It is concluded that some MOSFET dosimeters may have a strong angular dependence when placed on the surface of water-equivalent material, even though they may have an isotropic angular response when surrounded by uniform medium. Extra on-surface calibration maybe necessary before using MOSFET dosimeters for skin dose measurement in tangential fields.
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Affiliation(s)
- Songbing Qin
- School of Radiation Medicine and Protection, Medical College of Soochow University, Suzhou, China
- Department of Radiation Oncology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Ting Chen
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, 195 Little Albany Street, New Brunswick, NJ, 08901
| | - Lili Wang
- Department of Radiation Oncology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Yu Tu
- School of Radiation Medicine and Protection, Medical College of Soochow University, Suzhou, China
| | - Ning Yue
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, The State University of New Jersey, 195 Little Albany Street, New Brunswick, NJ, 08901
| | - Juying Zhou
- Department of Radiation Oncology, The First Affiliated Hospital of Soochow University, Suzhou, China
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Riou O, Fenoglietto P, Lemanski C, Azria D. Radiothérapie conformationnelle avec modulation d’intensité dans les cancers du sein : intérêt, limitations, modalités techniques. Cancer Radiother 2012; 16:479-84. [DOI: 10.1016/j.canrad.2012.05.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Accepted: 05/20/2012] [Indexed: 12/21/2022]
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Shi YX, Xia Q, Peng RJ, Yuan ZY, Wang SS, An X, Cao Y, Tan YT, Jin Y, Cai XY, Sun YL, Teng XY, Liu DG, Jiang WQ. Comparison of clinicopathological characteristics and prognoses between bilateral and unilateral breast cancer. J Cancer Res Clin Oncol 2012; 138:705-14. [DOI: 10.1007/s00432-011-1141-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2011] [Accepted: 12/22/2011] [Indexed: 12/24/2022]
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15
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Bilateral breast cancer: analysis of incidence, outcome, survival and disease characteristics. Breast Cancer Res Treat 2010; 126:131-40. [DOI: 10.1007/s10549-010-1057-y] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2010] [Accepted: 07/08/2010] [Indexed: 11/26/2022]
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Simultaneous integrated boost radiotherapy for bilateral breast: a treatment planning and dosimetric comparison for volumetric modulated arc and fixed field intensity modulated therapy. Radiat Oncol 2009; 4:27. [PMID: 19630947 PMCID: PMC2722660 DOI: 10.1186/1748-717x-4-27] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2009] [Accepted: 07/24/2009] [Indexed: 11/30/2022] Open
Abstract
Purpose A study was performed comparing dosimetric characteristics of volumetric modulated arcs (RapidArc, RA) and fixed field intensity modulated therapy (IMRT) on patients with bilateral breast carcinoma. Materials and methods Plans for IMRT and RA, were optimised for 10 patients prescribing 50 Gy to the breast (PTVII, 2.0 Gy/fraction) and 60 Gy to the tumour bed (PTVI, 2.4 Gy/fraction). Objectives were: for PTVs V90%>95%, Dmax<107%; Mean lung dose MLD<15 Gy, V20 Gy<22%; heart involvement was to be minimised. The MU and delivery time measured treatment efficiency. Pre-treatment dosimetry was performed using EPID and a 2D-array based methods. Results For PTVII minus PTVI, V90% was 97.8 ± 3.4% for RA and 94.0 ± 3.5% for IMRT (findings are reported as mean ± 1 standard deviation); D5%-D95% (homogeneity) was 7.3 ± 1.4 Gy (RA) and 11.0 ± 1.1 Gy (IMRT). Conformity index (V95%/VPTVII) was 1.10 ± 0.06 (RA) and 1.14 ± 0.09 (IMRT). MLD was <9.5 Gy for all cases on each lung, V20 Gy was 9.7 ± 1.3% (RA) and 12.8 ± 2.5% (IMRT) on left lung, similar for right lung. Mean dose to heart was 6.0 ± 2.7 Gy (RA) and 7.4 ± 2.5 Gy (IMRT). MU resulted in 796 ± 121 (RA) and 1398 ± 301 (IMRT); the average measured treatment time was 3.0 ± 0.1 minutes (RA) and 11.5 ± 2.0 (IMRT). From pre-treatment dosimetry, % of field area with γ <1 resulted 98.8 ± 1.3% and 99.1 ± 1.5% for RA and IMRT respectively with EPID and 99.1 ± 1.8% and 99.5 ± 1.3% with 2D-array (ΔD = 3% and DTA = 3 mm). Conclusion RapidArc showed dosimetric improvements with respect to IMRT, delivery parameters confirmed its logistical advantages, pre-treatment dosimetry proved its reliability.
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Irvine T, Allen DS, Gillett C, Hamed H, Fentiman IS. Prognosis of synchronous bilateral breast cancer. Br J Surg 2009; 96:376-80. [DOI: 10.1002/bjs.6553] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Abstract
Background
The prognosis of patients with synchronous bilateral breast cancer (SBBC) is usually based on the tumour with the worst pathological features. There is little evidence in the literature for this assumption, potentially impairing reasoned decisions on optimal adjuvant therapy.
Methods
This was a case–control study in which 68 women with SBBC were matched with 128 women with unilateral breast cancer. Both the GuysRisk prognostic model and the Nottingham Prognostic Index were used to determine the bilateral tumour with the poorer prognosis. Controls were matched for age, menopausal status, date of diagnosis, histological type and grade, and oestrogen receptor and axillary node status.
Results
Both prognostic models indicated the same side tumour with the worst prognosis. Kaplan–Meier survival curves for both disease-free and overall survival showed no significant difference in outcome between the two groups.
Conclusion
Prognosis was determined by the tumour with the worst prognosis, with no additional worsening of outcome incurred from the second tumour.
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Affiliation(s)
- T Irvine
- Hedley Atkins Breast Unit, Guy's Hospital, London, UK
| | - D S Allen
- Hedley Atkins Breast Unit, Guy's Hospital, London, UK
| | - C Gillett
- Hedley Atkins Breast Unit, Guy's Hospital, London, UK
| | - H Hamed
- Hedley Atkins Breast Unit, Guy's Hospital, London, UK
| | - I S Fentiman
- Hedley Atkins Breast Unit, Guy's Hospital, London, UK
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