RAD51 and neoplasm: The results of the combination of radiotherapy and imatinib in an animal model with xenotransplantation of PC3 (prostate adenocarcinoma) cells were quite promising: expression of RAD51 was reduced, and the delay of radiotherapy-induced tumor growth was further increased by imatinib; also, very importantly, there was no increased radiation gut toxicity as assayed by determining intestinal crypt cell survival [79].