Finally, we investigated the functional association between USP19 and 14 genes (DSB repair genes—BARD1, BRCA1, BRCA2, BRIP1, CHEK2, MRE11, NBN, PALB2, PTEN, RAD50, RAD51, RAD51C, RAD51D, and TP53) related to hereditary breast and ovarian cancer syndrome in DisGeNet (ID: C0677776) by using the HumanNet v2 functional network (https://www.inetbio.org/humannet/ (accessed on 2 December 2020)), which is a tool for identifying an association between candidate genes and specific diseases using a functional gene network [21]. This evidence concerns the gene PTEN and hereditary breast ovarian cancer syndrome.