ERBB2 and mucinous adenocarcinoma: Regarding HER2 positivity, serous (29%) and mucinous carcinomas (38%) had higher positivity than endometrioid (20%) and clear cell carcinomas (23.1%), while the differential expressions of HER2 among different tissue types in epithelial ovarian carcinoma were important biomarkers for prognosis in epithelial ovarian cancer (127).