GPR12 and colon mucinous adenocarcinoma: The GPR12 protein expressions in low-grade serous ovarian cancer (LGSOC), high-grade serous ovarian cancer (HGSOC), mucinous adenocarcinoma (MC), endometrioid adenocarcinoma (EC), clear cell adenocarcinoma (CCA), and normal ovarian epithelial tissues were examined by immunohistochemical staining, respectively.