An analysis of the presence of mutations in BRCA1, BRCA2, RAD51C, PALB2, and CHEK2 with the age of onset of ovarian cancer revealed a lower age of ovarian cancer diagnosis in BRCA1 mutation carriers than in non-carriers of BRCA1 (51.6 vs. 57.6, p = 2.97 × 10−11). The gene discussed is CHEK2; the disease is ovarian carcinoma.