PAX8 and ovarian mucinous adenocarcinoma: Consistent with previous reports (Laury et al., 2011), immunohistochemical assessment of an EOC tissue microarray (Figure 1—figure supplement 1D) containing 674 samples (Supplementary file 2) showed that PAX8 was ubiquitously expressed in various histopathological subtypes spanning serous, clear cell, endometrioid and mucinous ovarian carcinomas, but not within the adjacent or normal tissues (Figure 1C).