Second cancer risk evaluation from breast radiotherapy using dose-response models
Mohamed Hassan, â., Attalla, E., El gohary, M. (2021). Second cancer risk evaluation from breast radiotherapy using dose-response models. EKB Journal Management System, 22(1), 29-43. doi: 10.21608/ejbbe.2021.90963.1049
‪Ibrahim Mohamed Hassan; Ehab Marouf Attalla; Mohamed Ismail El gohary. "Second cancer risk evaluation from breast radiotherapy using dose-response models". EKB Journal Management System, 22, 1, 2021, 29-43. doi: 10.21608/ejbbe.2021.90963.1049
Mohamed Hassan, â., Attalla, E., El gohary, M. (2021). 'Second cancer risk evaluation from breast radiotherapy using dose-response models', EKB Journal Management System, 22(1), pp. 29-43. doi: 10.21608/ejbbe.2021.90963.1049
Mohamed Hassan, â., Attalla, E., El gohary, M. Second cancer risk evaluation from breast radiotherapy using dose-response models. EKB Journal Management System, 2021; 22(1): 29-43. doi: 10.21608/ejbbe.2021.90963.1049

Second cancer risk evaluation from breast radiotherapy using dose-response models

Egyptian Journal of Biomedical Engineering and Biophysics
Article 4, Volume 22, Issue 1, 2021, Page 29-43  XML PDF (1.32 MB)
Document Type: Original Article
DOI: 10.21608/ejbbe.2021.90963.1049
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Authors
‪Ibrahim Mohamed Hassan email orcid 1; Ehab Marouf Attalla2; Mohamed Ismail El goharyorcid 3
1Physics Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt.
2Radiotherapy Department, National Cancer Institute, Faculty of Medicine, Cairo University, Giza, Egypt
3Physics Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt
Abstract
This study aimed to estimate the radiation-induced second cancer risks in normal tissues after the treatment of breast cancer with three-dimensional conformal radiotherapy (3DCRT) and intensity-modulated radiotherapy (IMRT). In this study, 10 patients with breast cancer have been chosen.Three-dimensional conformal radiotherapy (3DCRT), intensity-modulated radiotherapy (IMRT) plans were designed. The 3DCRT and IMRT plans were evaluated and compared with several dosimetric parameters for Planning Target Volume (PTV) and the Organs at Risk (OARs). The Organ Equivalent Dose (OED) was calculated based on linear, linear-exponential, and plateau dose-response models. The Second cancer risks were estimated by Excess absolute risk (EAR) for OARs. For breast, PTV dose coverage parameters were significantly improved in IMRT compared to 3DCRT.The ipsilateral lung V30Gy % and V20Gy % were significantly decreased with IMRT. However, The IMR plans were shown significant increases (p < 0.05) in the mean doses Dmean to OARs. Compared with the 3DCRT, the IMRT plans increase OED in OARs based on the linear, plateau and linear-exponential models. The second cancer risk with IMRT increased by 2.5 -3.5fold, 3.3-4fold, 3-7fold, and 4.6-5.3fold for contralateral lung, contralateral breast, esophagus, and stomach based on dose-response model applied. Conclusion: IMRT technique demonstrated a clear advantage in dose coverage, conformity, and homogeneity over 3DCRT and was superior in terms of OAR-sparing. The Second cancer risk in normal tissues based on the EAR model after IMRT is higher than 3DCRT. Advanced radiotherapy techniques as IMRT for breast cancer treatment must be evaluated based on secondary cancer risks when treating young patients
Keywords
Three-Dimensional Conformal Radiotherapy (3DCRT); Intensity Modulated Radiotherapy (IMRT); Second cancer risk; Breast cancer; Organ Equivalent Dose (OED)
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