TAILIEUCHUNG - Báo cáo y học: "Hypofractionated radiotherapy has the potential for second cancer reduction"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học quốc tế cung cấp cho các bạn kiến thức về ngành y đề tài: Hypofractionated radiotherapy has the potential for second cancer reduction. | Schneider et al. Theoretical Biology and Medical Modelling 2010 7 4 http content 7 1 4 THEORETICAL BIOLOGY AND MEDICAL MODELLING RESEARCH Open Access Hypofractionated radiotherapy has the potential for second cancer reduction Uwe Schneider1 2 Jurgen Besserer1 Andreas Mack1 Correspondence uschneider@ Radiotherapy Hirslanden AG Institute for Radiotherapy Rain 34 5001 Aarau Switzerland 2 BioMed Central Abstract Background and Purpose A model for carcinoma and sarcoma induction was used to study the dependence of carcinogenesis after radiotherapy on fractionation. Materials and methods A cancer induction model for radiotherapy doses including fractionation was used to model carcinoma and sarcoma induction after a radiation treatment. For different fractionation schemes the dose response relationships were obtained. Tumor induction was studied as a function of dose per fraction. Results If it is assumed that the tumor is treated up to the same biologically equivalent dose it was found that large dose fractions could decrease second cancer induction. The risk decreases approximately linear with increasing fraction size and is more pronounced for sarcoma induction. Carcinoma induction decreases by around 10 per 1 Gy increase in fraction dose. Sarcoma risk is decreased by about 15 per 1 Gy increase in fractionation. It is also found that tissue which is irradiated using large dose fractions to dose levels lower than 10 of the target dose potentially develop less sarcomas when compared to tissues irradiated to all dose levels. This is not observed for carcinoma induction. Conclusions It was found that carcinoma as well as sarcoma risk decreases with increasing fractionation dose. The reduction of sarcoma risk is even more pronounced than carcinoma risk. Hypofractionation is potentially beneficial with regard to second cancer induction. Introduction Although the increased risk for radiotherapy patients to develop a secondary malignancy is .

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