ATM and breast cancer: Contradictory to the reported frequencies of ATM mutations in other studies (OvCa = 1.5% [1, 13], BC = 4% [14], PaC = 5% [16] and PC = 4% [15]), the present one found that ATM variants were most common in OvCa (n = 7) and absent in PC and BC, which can be explained by the limited overall sample size.