PTPRM and borderline epithelial tumor of ovary: Tissue samples from several cases of ovarian epithelial tumors—including 57 cases of EOC, 18 of borderline epithelial ovarian tumors, 30 of benign ovarian epithelial tumors, and 15 cases of normal ovarian and uterine tube tissues—were stained by immunohistochemistry, and the results showed that PTPRM had the highest positive expression rate in normal ovarian and uterine tube tissues, followed by benign ovarian epithelial tumors and borderline epithelial ovarian tumors;the lowest positive expression rate was observed in EOC.