ERBB2 and ovarian carcinoma: Importantly, undetectable MRN complex showed stronger association with the Kurman model of two progression pathways: Type I low-grade ovarian carcinomas (low-grade serous cancer, mucinous, endometrioid and clear cell cancer), which are characterized by mutations in genes like KRAS, BRAF, ERBB2, PTEN, PI3KCA, CTNNB1, ARID1A and PPP2R1A, in the absence of TP53 mutations.