The number of RAD51 positive cells were not changed or were increased by ATL or the combination of ATL and olaparib over a 24 h time period (Fig. 2f and Fig. S4A, B), indicating that the PC-3, A549, and SW480 cancer cells were able to efficiently assemble recombination filaments, and 10 μM ATL alone or in combination with 10 μM olaparib did not reduce the recombination capacity. This evidence concerns the gene RAD51 and cancer.