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Shi J, Liu J, Tian G, Li D, Liang D, Wang J, He Y. Association of radiotherapy for stage I-III breast cancer survivors and second primary malignant cancers: a population-based study. Eur J Cancer Prev 2024; 33:115-128. [PMID: 37669169 DOI: 10.1097/cej.0000000000000837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
PURPOSE With life span extending, breast cancer survivors may face the possibility of developing second primary cancers (SPCs). The objective of this research is to investigate the risk factors, risk attribute to radiotherapy and the survivalship for SPCs. METHODS A total of 445 523 breast cancer patients were enrolled from Surveillance, Epidemiology, and End Results database in 2000-2018. The risk factors for SPCs development were confirmed by competing risk model, and then were integrated to the nomogram establishment. The cumulative incidence of SPCs including SBC (second breast cancer), SGC (second gynecological cancer), and SLC (second lung cancer) were estimated. The radiotherapy-associated risk for SPCs were evaluated by Poisson regression in radiotherapy and no-radiotherapy. Propensity score matching was used to reduce possible bias for survival comparison. RESULTS There were 57.63% patients in radiotherapy. The risk factors for developing SPCs were age, year, race, tumor size, stage, radiotherapy, grade, surgery, and histology. The cumulative incidence of SPCs was 7.75% in no-radiotherapy and 10.33% in radiotherapy. SLC, SBC, and SGC also appeared the similar results. The increased risk of developing SPCs were associated with radiotherapy in majority subgroups. The dynamic radiotherapy-associated risk for SPCs by age slightly increased risk was observed. Regardless radiotherapy or no-radiotherapy, the 10-year overall survival for SBC (radiotherapy: 59.41%; no-radiotherapy: 55.53%) and SGC (radiotherapy: 48.61%; no-radiotherapy: 35.53%) were worse than that among matched patients with only primary cancers. CONCLUSIONS Breast cancer survivors remained a high radiotherapy-associated risk for developing SPCs. The prognosis in radiotherapy was better than in no-radiotherapy for some specific SPCs. Largely attention should be paid to these patients.
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Affiliation(s)
- Jin Shi
- Cancer Institute, The Fourth Hospital of Hebei Medical University, The Tumor Hospital of Hebei Province
| | - Jian Liu
- The Service Center of Comprehensive Supervision Health Commission of Hebei Province
| | - Guo Tian
- Department of Medical Records, The Fourth Hospital of Hebei Medical University, The Tumor Hospital of Hebei Province
| | - Daojuan Li
- Cancer Institute, The Fourth Hospital of Hebei Medical University, The Tumor Hospital of Hebei Province
| | - Di Liang
- Cancer Institute, The Fourth Hospital of Hebei Medical University, The Tumor Hospital of Hebei Province
| | - Jun Wang
- Department of Radiation Oncology, The Fourth Hospital of Hebei Medical University, The Tumor Hospital of Hebei Province, Shijiazhuang, Hebei, China
| | - Yutong He
- Cancer Institute, The Fourth Hospital of Hebei Medical University, The Tumor Hospital of Hebei Province
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Salim N, Popodko A, Tumanova K, Stolbovoy A, Lagkueva I, Ragimov V. Cardiac dose in the treatment of synchronous bilateral breast cancer patients between three different radiotherapy techniques (VMAT, IMRT, and 3D CRT). Discov Oncol 2023; 14:29. [PMID: 36862205 PMCID: PMC9981832 DOI: 10.1007/s12672-023-00636-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 02/22/2023] [Indexed: 03/03/2023] Open
Abstract
PURPOSE Synchronous bilateral irradiation of both mammary glands and chest wall is a challenging task due to technical difficulties and limited evidence supporting an optimal technique to improve treatment outcomes. We studied and compared the dosimetry data of three radiotherapy techniques to select the most optimal one. METHODS We compared three-dimensional conformal radiation treatment (3D CRT), intensity-modulated radiation therapy (IMRT), and volumetric modulated arc therapy (VMAT) during irradiation of synchronous bilateral breast cancer in nine patients followed by examination of dose distribution to the cardiac conduction system (SA node, AV node and Bundle of His), myocardium, lungs, left anterior descending artery (LADA) and right coronary artery (RCA) . RESULTS VMAT is the most sparing technique for SBBC treatment. Even though doses to the SA node, AV node and Bundle of His were higher with VMAT (Dmean were 3.75 ± 0.62, 2.58 ± 0.83 and 3.03 ± 1.18 Gy respectively) compared with 3D CRT (Dmean were 2.61 ± 0.66, 1.52 ± 0.38 and 1.88 ± 0.70 Gy respectively), this difference is statistically insignificant. Doses to the right and left lung (average Dmean = 12.65 ± 3.20 Gy, V20Gy = 24.12 ± 6.25%), myocardium (Dmean = 5.33 ± 1.51 Gy, V10Gy = 9.80 ± 3.83%, V20Gy = 7.19 ± 3.15%, V25Gy = 6.20 ± 2.93%), and LADA (Dmean = 10.04 ± 4.92 Gy, V20Gy = 18.17 ± 13.24% and V25Gy = 15.41 ± 12.19%) were highest with 3D CRT. The highest Dmean in the cardiac conduction system (5.30 ± 2.23, 3.15 ± 1.61 and 3.89 ± 1.85 Gy respectively) was observed with IMRT, and a similar effect was noted in RCA (Dmean = 7.48 ± 2.11 Gy). CONCLUSION VMAT is the optimal and satisfactory radiation therapy technique for sparing organs at risk (OARs). With VMAT, a lower Dmean value was noted in the myocardium, LADA, and lungs. The use of 3D CRT significantly increases the dose of radiation reaching the lungs, myocardium, and LADA, which can subsequently cause cardiovascular and lung complications, but not in the cardiac conduction system.
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Affiliation(s)
- Nidal Salim
- Department of Radiation Oncology, European Medical Center, Moscow, Russia
- Department of Radiation Oncology, Russian Medical Academy of Continuous Medical Education of the Ministry of Health, Moscow, Russia
| | - Alexey Popodko
- Department of Radiation Oncology, European Medical Center, Moscow, Russia
| | - Kristina Tumanova
- Department of Radiation Oncology, European Medical Center, Moscow, Russia.
| | - Alexandr Stolbovoy
- Department of Radiation Oncology, European Medical Center, Moscow, Russia
- Department of Radiation Oncology, Russian Medical Academy of Continuous Medical Education of the Ministry of Health, Moscow, Russia
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Parhizgar P, Bahadori Monfared A, Mohseny M, Keramatinia A, Hashemi Nazari SS, Rahman SA, Al Marzouqi A, Al-Yateem N, Mosavi Jarrahi A. Risk of second primary cancer among breast cancer patients: A systematic review and meta-analysis. Front Oncol 2023; 12:1094136. [PMID: 36733366 PMCID: PMC9887162 DOI: 10.3389/fonc.2022.1094136] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 12/20/2022] [Indexed: 01/18/2023] Open
Abstract
Objectives The aim of this study was to estimate the extra risk of second primary cancer among breast cancer patients. Methods and materials This is a systematic review. A comprehensive search of literature was performed in PubMed, Web of Science, Cochrane library, and Scopus. The search included all published studies up to October 2022. This systematic review included studies published in the English language that reported the risk of second primary non-breast cancer [i.e., standardized incidence ratio (SIR)] among breast cancer patients older than 15 years. After evaluating the methodological quality of the selected studies, SIRs were pooled with consideration of heterogeneity among studies. The estimates were pooled by age and time since the diagnosis of primary breast cancer for both sexes (male and female). Age was categorized based on before 50 years and after 50 years, and time was categorized as duration of less than and more than 10 years, respectively. Results From 2,484 articles, 30 articles were eligible for inclusion in the systematic review and meta-analysis. The studies varied in terms of population, number of cases, study design, setting, and year of implementation of the research. The estimated SIR for men and women was 1.28 (95% CI: 1.18, 1.38) and 1.27 (95% CI: 1.15, 1.39), respectively. Women diagnosed with breast cancer before menopause [SIR: 1.52 (95% CI: 1.34, 1.71) vs. 1.21 (95% CI: 1.08, 1.34)] as well as women after 10 years since their breast cancer diagnosis [1.33 (95% CI: 1.22, 1.431) vs. 1.24 (95% CI: 1.10, 1.37)] were at a higher risk of developing second primary cancer. Among men, while there were no differences in risk based on age, with the increase of time, the risk of second primary cancer was reduced [SIR: 1.22 (95% CI: 1.12, 1.33) vs. 1.00 (95% CI: 0.79, 1.22)]. Conclusion There is an extra risk of second primary cancer among breast cancer patients. The extra risk should be considered for further screening and preventive measures among this population. Systematic review registration https://www.crd.york.ac.uk/prospero/display_record.php?RecordID=336062, identifier (CRD42022336062).
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Affiliation(s)
- Parynaz Parhizgar
- School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ayad Bahadori Monfared
- Department of Social Medicine, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Maryam Mohseny
- Department of Social Medicine, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Aliasghar Keramatinia
- Department of Social Medicine, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Seyed Saeed Hashemi Nazari
- Department of Social Medicine, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran,Prevention of Cardiovascular Disease Research Center, Department of Epidemiology, School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Syed Azizur Rahman
- Department of Health Service Administration, College of Health Sciences, University of Sharjah, Sharjah, United Arab Emirates
| | - Amina Al Marzouqi
- Department of Nursing, College of Health Sciences, University of Sharjah, Sharjah, United Arab Emirates
| | - Nabeel Al-Yateem
- Department of Nursing, College of Health Sciences, University of Sharjah, Sharjah, United Arab Emirates,*Correspondence: Nabeel Al-Yateem, ; Alireza Mosavi Jarrahi,
| | - Alireza Mosavi Jarrahi
- Department of Social Medicine, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran,Cancer and Epidemiology Research Center, West Asia Organization for Cancer Prevention, Sabzevar, Iran,*Correspondence: Nabeel Al-Yateem, ; Alireza Mosavi Jarrahi,
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Vogel M, Gade J, Timm B, Schürmann M, Auerbach H, Nüsken F, Rübe C, Melchior P, Dzierma Y. Comparison of Breast Cancer Radiotherapy Techniques Regarding Secondary Cancer Risk and Normal Tissue Complication Probability - Modelling and Measurements Using a 3D-Printed Phantom. Front Oncol 2022; 12:892923. [PMID: 35965556 PMCID: PMC9365503 DOI: 10.3389/fonc.2022.892923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 06/15/2022] [Indexed: 11/13/2022] Open
Abstract
Background Radiotherapy after breast-conserving therapy is a standard postoperative treatment of breast cancer, which can be carried out with a variety of irradiation techniques. The treatment planning must take into consideration detrimental effects on the neighbouring organs at risk-the lung, the heart, and the contralateral breast, which can include both short- and long-term effects represented by the normal tissue complication probability and secondary cancer risk. Patients and Methods In this planning study, we investigate intensity-modulated (IMRT) and three-dimensional conformal (3D-CRT) radiotherapy techniques including sequential or simultaneously integrated boosts as well as interstitial multicatheter brachytherapy boost techniques of 38 patients with breast-conserving surgery retrospectively. We furthermore develop a 3D-printed breast phantom add-on to allow for catheter placement and to measure the out-of-field dose using thermoluminescent dosimeters placed inside an anthropomorphic phantom. Finally, we estimate normal tissue complication probabilities using the Lyman-Kutcher-Burman model and secondary cancer risks using the linear non-threshold model (out-of-field) and the model by Schneider et al. (in-field). Results The results depend on the combination of primary whole-breast irradiation and boost technique. The normal tissue complication probabilities for various endpoints are of the following order: 1%-2% (symptomatic pneumonitis, ipsilateral lung), 2%-3% (symptomatic pneumonitis, whole lung), and 1%-2% (radiation pneumonitis grade ≥ 2, whole lung). The additional relative risk of ischemic heart disease ranges from +25% to +35%. In-field secondary cancer risk of the ipsilateral lung in left-sided treatment is around 50 per 10,000 person-years for 20 years after exposure at age 55. Out-of-field estimation of secondary cancer risk results in approximately 5 per 10,000 person-years each for the contralateral lung and breast. Conclusions In general, 3D-CRT shows the best risk reduction in contrast to IMRT. Regarding the boost concepts, brachytherapy is the most effective method in order to minimise normal tissue complication probability and secondary cancer risk compared to teletherapy boost concepts. Hence, the 3D-CRT technique in combination with an interstitial multicatheter brachytherapy boost is most suitable in terms of risk avoidance for treating breast cancer with techniques including boost concepts.
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Affiliation(s)
- Marc Vogel
- Department of Radiotherapy and Radiation Oncology, Saarland University Medical Centre, Homburg, Germany
| | - Jonas Gade
- Department of Radiotherapy and Radiation Oncology, Saarland University Medical Centre, Homburg, Germany
| | - Bernd Timm
- Siemens Healthcare GmbH, Technical Service, Erlangen, Germany
| | - Michaela Schürmann
- Department of Radiotherapy and Radiation Oncology, Saarland University Medical Centre, Homburg, Germany
| | - Hendrik Auerbach
- Department of Radiotherapy and Radiation Oncology, Saarland University Medical Centre, Homburg, Germany
| | - Frank Nüsken
- Department of Radiotherapy and Radiation Oncology, Saarland University Medical Centre, Homburg, Germany
| | - Christian Rübe
- Department of Radiotherapy and Radiation Oncology, Saarland University Medical Centre, Homburg, Germany
| | - Patrick Melchior
- Department of Radiotherapy and Radiation Oncology, Saarland University Medical Centre, Homburg, Germany
| | - Yvonne Dzierma
- Department of Radiotherapy and Radiation Oncology, Saarland University Medical Centre, Homburg, Germany
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He L, Wang X, Liu X, Jia Y, Zhao W, Jia X, Zhu Y, Meng W, Tong Z. Analysis of Clinical Characteristics, Treatment, and Prognostic Factors of 106 Breast Cancer Patients With Solitary Pulmonary Nodules. Front Surg 2022; 9:843913. [PMID: 35242809 PMCID: PMC8885491 DOI: 10.3389/fsurg.2022.843913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 01/17/2022] [Indexed: 11/20/2022] Open
Abstract
Objective The clinical features of solitary pulmonary nodules (SPN) in breast cancer patients were retrospectively analyzed, and the clinical features of primary lung cancer (PLC) and metastatic pulmonary breast cancer (MBC) in breast cancer patients were compared, and the treatment plan, curative effect and influencing factors were analyzed. Methods The clinical data of 106 patients of SPN combined with breast cancer surgery in our hospital from January 2015 to June 2020 were analyzed. There were 65 patients of PLC and 41 patients of MBC. Record the characteristics of the primary breast cancer lesion in our patient, the interval between the initial diagnosis of breast cancer and the appearance of SPN, the previous treatment history of our patient, and the characteristics and surgical method of SPN. The survival status of all patients during the follow-up period was recorded. Results The onset age, interval, maximum nodule diameter, ER expression positive rate and radiotherapy history ratio of PLC patients were higher than those of MBC patients, and the lymph node positive rate and triple negative rate were lower than those of MBC patients (P < 0.05). Median survival was 51 months in patients with PLC and 37 months in patients with MBC. The 1, 3, and 5 year overall survival rates in patients with PLC were higher than those in patients with MBC (P < 0.05). Vascular tumor thrombus, SPN type and chemotherapy were all independent factors affecting the prognosis of patients with breast cancer combined with SPN (P < 0.05). Conclusion PLC patients and MBC patients have significant differences in pathological characteristics, like the onset age, interval, maximum nodule diameter, ER expression positive rate, radiotherapy history ratio, the lymph node positive rate, and triple negative rate. Septum, vascular tumor thrombus, SPN type, and chemotherapy are all independent factors that affect the curative effect of breast cancer patients with SPN. Based on the nature of SPN, it can provide reference for clinicians to decide the treatment plan, improve patients' quality of life and prolong their survival time.
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Stanton C, Bell LJ, Le A, Griffiths B, Wu K, Adams J, Ambrose L, Andree-Evarts D, Porter B, Bromley R, van Gysen K, Morgia M, Lamoury G, Eade T, Booth JT, Carroll S. Comprehensive nodal breast VMAT: solving the low-dose wash dilemma using an iterative knowledge-based radiotherapy planning solution. J Med Radiat Sci 2021; 69:85-97. [PMID: 34387031 PMCID: PMC8892431 DOI: 10.1002/jmrs.534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 07/07/2021] [Accepted: 07/29/2021] [Indexed: 12/25/2022] Open
Abstract
Introduction Aimed to develop a simple and robust volumetric modulated arc radiotherapy (VMAT) solution for comprehensive lymph node (CLN) breast cancer without increase in low‐dose wash. Methods Forty CLN‐breast patient data sets were utilised to develop a knowledge‐based planning (KBP) VMAT model, which limits low‐dose wash using iterative learning and base‐tangential methods as benchmark. Another twenty data sets were employed to validate the model comparing KBP‐generated ipsilateral VMAT (ipsi‐VMAT) plans against the benchmarked hybrid (h)‐VMAT (departmental standard) and bowtie‐VMAT (published best practice) methods. Planning target volume (PTV), conformity/homogeneity index (CI/HI), organ‐at‐risk (OAR), remaining‐volume‐at‐risk (RVR) and blinded radiation oncologist (RO) plan preference were evaluated. Results Ipsi‐ and bowtie‐VMAT plans were dosimetrically equivalent, achieving greater nodal target coverage (P < 0.05) compared to h‐VMAT with minor reduction in breast coverage. CI was enhanced for a small reduction in breast HI with improved dose sparing to ipsilateral‐lung and humeral head (P < 0.05) at immaterial expense to spinal cord. Significantly, low‐dose wash to OARs and RVR were comparable between all plan types demonstrating a simple VMAT class solution robust to patient‐specific anatomic variation can be applied to CLN breast without need for complex beam modification (hybrid plans, avoidance sectors or other). This result was supported by blinded RO review. Conclusions A simple and robust ipsilateral VMAT class solution for CLN breast generated using iterative KBP modelling can achieve clinically acceptable target coverage and OAR sparing without unwanted increase in low‐dose wash associated with increased second malignancy risk.
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Affiliation(s)
- Cameron Stanton
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Linda J Bell
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Andrew Le
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Brooke Griffiths
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Kenny Wu
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Jessica Adams
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Leigh Ambrose
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Denise Andree-Evarts
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Brian Porter
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Regina Bromley
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Kirsten van Gysen
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Marita Morgia
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Gillian Lamoury
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Thomas Eade
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia.,Northern Clinical School, University of Sydney, St Leonards, New South Wales, Australia
| | - Jeremy T Booth
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia.,Institute of Medical Physics, School of Physics, University of Sydney, Camperdown, New South Wales, Australia
| | - Susan Carroll
- Radiation Oncology Department, Northern Sydney Cancer Centre, Royal North Shore Hospital, St Leonards, New South Wales, Australia.,Northern Clinical School, University of Sydney, St Leonards, New South Wales, Australia
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Schlosser S, Rabinovitch R, Shatz Z, Galper S, Shahadi-Dromi I, Finkel S, Jacobson G, Rasco A, Friedman E, Laitman Y, Evron E, Bernstein R, Weiss I, Sklair-Levy M, Ben-David MA. Radiation-Associated Secondary Malignancies in BRCA Mutation Carriers Treated for Breast Cancer. Int J Radiat Oncol Biol Phys 2020; 107:353-359. [PMID: 32084523 DOI: 10.1016/j.ijrobp.2020.02.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 02/08/2020] [Accepted: 02/12/2020] [Indexed: 01/02/2023]
Abstract
PURPOSE Radiation therapy (RT), a standard breast cancer (BC) treatment modality, is associated with a small increased risk of in-field second primary malignancy (SPM). SPM rates after RT in BRCA mutation carriers have rarely been reported. An elevated risk of SPM would affect the safety of breast conservation for early BC or prophylactic radiation as a method of prevention. We analyzed a population of BRCA carriers irradiated for BC to determine whether there is an elevated rate of SPM. METHODS AND MATERIALS Patients with BC who were BRCA1 or BRCA2 carriers and were treated with breast and/or chest wall RT with or without regional lymph nodes between 1991 and 2012 at a single institution were retrospectively identified. Only those with ≥5 years of follow-up with adequate demographic, tumor, and radiation data were included. SPMs were recorded, and previously delivered RT doses to the organ and site of malignancy were determined. RESULTS Two hundred thirty women, of whom 80% carried an Ashkenazi Jewish founder mutation, met entry criteria with 3-dimensional RT delivered to 266 breasts or chest walls, including regional nodes in 110 (41%). With a median follow-up of 10 years (range, 5-27; mean 11.4) comprising 3042 person-years, 6 SPMs developed, of which only 1 (papillary thyroid carcinoma) was within the radiation field (crude rate of 0.38% of irradiated breasts or chest walls), diagnosed 17 years after RT. This corresponds to an incidence of 0.32 per 1000 woman-years. The Kaplan-Meier estimate of 20-year freedom from a radiation-induced SPM is 99.5%. Calculated dose exposure to the out-of-field SPMs ranged from 0.1 to 1 Gy. No patient developed an in-field skin cancer or sarcoma. CONCLUSIONS In this largest cohort of women treated with radiation therapy for BRCA-associated breast cancer, we identified no signal for an increased risk of radiation-induced SPMs compared with the general BC population, and the risk is extraordinarily small. Although larger cohorts and longer follow-up are needed, these results support the safety of RT in BRCA carriers.
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Affiliation(s)
- Shir Schlosser
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Rachel Rabinovitch
- Radiation Oncology Department, University of Colorado Comprehensive Cancer Center, Denver, Colorado
| | - Zina Shatz
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Shira Galper
- Radiation Oncology Department, Chaim Sheba Medical Center, Ramat-Gan, Israel
| | | | - Sara Finkel
- Radiation Oncology Department, Chaim Sheba Medical Center, Ramat-Gan, Israel
| | - Galia Jacobson
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Radiation Oncology Department, Chaim Sheba Medical Center, Ramat-Gan, Israel
| | - Adi Rasco
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Shamir Medical Center, Zeriffin, Israel
| | - Eitan Friedman
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Suzanne Levy Gertner Oncogenetics Unit, Institute of Human Genetics, Chaim Sheba Medical Center, Ramat-Gan, Israel
| | - Yael Laitman
- Suzanne Levy Gertner Oncogenetics Unit, Institute of Human Genetics, Chaim Sheba Medical Center, Ramat-Gan, Israel
| | - Ella Evron
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Kaplan Medical Center, Rehovot, Israel
| | - Rinat Bernstein
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Medical Oncology Department, Chaim Sheba Medical Center, Ramat-Gan, Israel
| | - Ilana Weiss
- Radiation Oncology Department, Chaim Sheba Medical Center, Ramat-Gan, Israel
| | - Miri Sklair-Levy
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Meirav Center, Chaim Sheba Medical Center, Ramat-Gan, Israel
| | - Merav A Ben-David
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Radiation Oncology Department, Chaim Sheba Medical Center, Ramat-Gan, Israel.
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Abstract
Radiotherapy is used in >50% of patients with cancer, both for curative and palliative purposes. Radiotherapy uses ionizing radiation to target and kill tumour tissue, but normal tissue can also be damaged, leading to toxicity. Modern and precise radiotherapy techniques, such as intensity-modulated radiotherapy, may prevent toxicity, but some patients still experience adverse effects. The physiopathology of toxicity is dependent on many parameters, such as the location of irradiation or the functional status of organs at risk. Knowledge of the mechanisms leads to a more rational approach for controlling radiotherapy toxicity, which may result in improved symptom control and quality of life for patients. This improved quality of life is particularly important in paediatric patients, who may live for many years with the long-term effects of radiotherapy. Notably, signs and symptoms occurring after radiotherapy may not be due to the treatment but to an exacerbation of existing conditions or to the development of new diseases. Although differential diagnosis may be difficult, it has important consequences for patients.
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