In general, the typical primary mucinous ovarian carcinomas are CK7-positive, with diffuse co-expression of CK20 and CDX2, PAX8 and SATB2-negative, while AMNs are CDX2, CK20, and SATB2-positive, and PAX8 and CK7-negative. The gene discussed is KRT7; the disease is ovarian mucinous adenocarcinoma.