RAD51 and invasive ductal breast carcinoma: It was reported that Rad51 expression in invasive ductal breast carcinoma was higher than in normal breast tissue, and was significantly correlated with the pathological stage [16]In our study, although we did not note a significant correlation of Rad51 with CRC tumor stage, we found Rad51 expression was markedly higher in poorly differentiated carcinoma compared to the well differentiated carcinoma, supporting the observation that Rad51 is commonly associated with malignant histophenotypes.