“…While criteria used to identify metastatic carcinomas—and differentiate them from primary tumors—are mainly based on clinicopathologic findings, loss of heterozygosity (LOH) and mutational analysis may provide useful additional information, since prognosis and therapy of those two entities are different [7]. Furthermore, breast cancer metastasis to the ovaries with a prevalence from 10 to 30% is associated with BRCA1/2 mutation carriers, which have worse prognosis, and is usually diagnosed during autopsy, prophylactic or therapeutic oophorectomies, and as incidental findings during routine surgery [8]. To date, metastatic breast cancer is generally identified histologically by the positive expression of gross cystic disease fluid protein 15 (GCDFP15), mammaglobin, and GATA3 and by the lack of expression of PAX8, CA125, and WT1.…”