In contrast to this, monoallelic variants of the RAD51 gene and of five of its paralogs have recently been involved in cancer predisposition: RAD51B, RAD51C, and RAD51D in OC; RAD51, RAD51B, and XRCC2 in BC [35,186,187,188,189,190,191,192,193,194]. The gene discussed is RAD51; the disease is breast cancer.