ATM and breast cancer: Some other genes, such as PTEN, ataxia telangiectasia mutated (ATM) [14], check-point kinase 2 homolog (CHEK2) [15], Rad50 DNA repair protein [16], BRCA1-interacting protein C-terminal helicase 1 (BRIP1) [17] and fibroblast growth factor receptor 2 (FGFR2) [18] can also contribute to the risk of breast cancer at a low probability.