Mucinous carcinomas of the ovary and colon were examined by Chelariu-Raicu et al. using both standard (PAX8, CK20, CK7, CDX2, SATB2, and estrogen/progesterone) and novel (MUC1 and MUC5AC) biomarkers. Here, PAX8 is linked to ovarian mucinous adenocarcinoma.