Combination analysis of Bub1 and Mad2 expression in endometrial cancer: act as a prognostic factor in endometrial cancer

This study aimed to evaluate the diagnostic value of Bub1 and Mad2 together in endometrial cancer. Sixty-three patients with endometrial cancer, including EECs and NEECs, were examined statistically. Bub1 and Mad2 in patient tissues were detected by indirect streptavidin-biotin-peroxidase complex method. 39 cases (61.9 %) were in clinical stage I, 17 cases (27 %) in stage II, 5 (7.9 %) in stage III and 2 cases (3.2 %) in stage IV. Bub1 positive and Mad2 positive rate were identified in 18 and 54 patients. The lower positive of Bub1 and higher positive rate of Mad2 were related to clinical stage and histological grade of endometrial cancer (P = 0.009, 0.002, respectively), especially in NEECs. The expression of Bub1 was negatively correlated with Mad2 and Mtp53 (both P < 0.05). The expression of Mad2 with Mtp53 was positively correlated (P < 0.05). Statistically significant difference between Bub1/Mad2 expression and survival was discovered in endometrial cancer. Specificity and sensitivity of combination between Bub1 negative and Mad2 positive cases were higher than those alone in NEEC subtype. Bub1 and Mad2 are associated with histological differentiation, clinical stage and decreased postoperative survival in endometrial cancer. The combination analysis of Bub1 and Mad2 might be the valuable prognostic, even diagnostic clinicopathologic factor which can be applicable in routine examination.