CHEK2 and breast cancer: Nevertheless, MSH2, MSH6, MLH1, and PMS2 are part of extended germline testing in BC patients using the TruRisk©-Panel at German Centers for Familial Breast and Ovarian Cancer which currently includes ATM, BRCA1, BRCA2, BRIP1, CDH1, CHEK2, EPCAM, MLH1, MSH2, MSH6, PALB2, PMS2, PTEN, RAD51C, RAD51D, STK11, and TP53 [37].