Findings from a case-control study of Hodgkin lymphoma survivors after a 5-year period found a "dose-response association between radiotherapy and colorectal cancer risk, and modification of this association by procarbazine." Study authors also indicated that Hodgkin lymphoma survivors have a 2.8 times higher rate of a colorectal cancer diagnosis, a rate that remains at this increased level for over 40 years. While these results are specific to a 5-year period (patients treated more recently would experience lower radiotherapy and chemotherapy doses), "an understanding of the dose-response relationship is needed to quantify and estimate the risk of secondary cancers based on individual treatment exposures."
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Source mentioned: Geurts YM; Shakir R, Ntentas G, et al. Association of Radiation and Procarbazine Dose With Risk of Colorectal Cancer Among Survivors of Hodgkin Lymphoma. JAMA Oncology. Published online 2 February 2023. doi: 10.1001/jamaoncol.2022.7153.
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