APOBEC3B and breast neoplasm: (B–D) The mean A3B mRNA levels, mean APOBEC mutation percentages, and mean APOBEC enrichment scores in breast tumors with coordinated overexpression (high) or repression (low) of the 20 gene set (mean ± SD; n = 53 tumors in the high group and n = 111 in the low group; p values from Welch’s t-test).