APOBEC3B and breast cancer: In contrast, APOBEC3B or APOBEC3A expression levels were not significantly correlated with sensitivity to any drugs in breast cancer cell lines from the Genomics of Drug Sensitivity in Cancer (GDSC, or GDS1000) dataset [30]; however, they were associated with sensitivity to 38 and 16 agents, respectively, in a joint analysis of all cancer types [31].