CHEK2 and ovarian cancer: In addition, a subset of nineteen established and candidate breast or ovarian cancer genes (ATM, BARD1, BRCA1, BRCA2, BRIP1, CDH1, CHEK2, MLH1, MSH2, MSH6, NBN, NF1, PALB2, PMS2, PTEN, RAD51C, RAD51D, STK11 and TP53) were investigated for all sequence variants.