ATM and ovarian cancer: We hereby present 2 cases of OC in which a germline heterozygous pathogenic variant in the ATM gene was identified: the first in the contest of Hereditary Breast and Ovarian Cancer (HBOC) family history and, in the other one, a late onset of neoplasms, to underline the importance of defining guidelines and management of moderate penetrance genes variants also for ovarian cancer prevention.