Prognostic significance of hormone receptor (ER/PR) status in endometrial carcinoma in black women: Implications with lymph node metastasis.

e18099 Background: Histological examination of tumor tissues is necessary for deciding if endometrial surgery should include lymph node sampling. Studies have demonstrated that loss of estrogen and progesterone receptors (ER/ PR) independently predicts lymph node metastasis and poor prognosis. African American females in comparison to their Caucasian counterparts are diagnosed at a later stage, with higher grade, poorer prognostic histological types and worse outcomes. Our study aimed to investigate if the correlation between hormone receptor status and lymph node metastasis holds true in African American females which could aid in treatment strategies. Methods: We reviewed African American females (n = 70) diagnosed with Endometrial Cancer at our institution from 2015-2018 including endometrioid/non-endometrioid histology, FIGO stage I-IV, grade 1-3 for ER/PR receptors and presence or absence of pelvic lymph nodes based on preoperative endometrial curettage and post-surgical pathology specimens. Statistical analyses were performed using Fisher’s Exact test exploring associations between categorical variables (ER/PR and Lymph nodes Metastasis). All statistical tests were two-sided and considered significant if P value < 0.05. Results: The mean age of our sample was 61 ± 13 years. Mean BMI was 36±10kg/m2. Majority of our patients were postmenopausal (59 out of 70, 84%). FIGO Stage 1 and 2 constituted 72% (50 out of 70). Endometrioid histology constituted 39 out of 70 (55%) cases and non-endometrioid histology which includes serous, mixed and carcinosarcomas constituted 45% of the cases. Loss of estrogen receptor(ER-) was observed in 19 of 70 patients (27%) and loss of progesterone receptor(PR-) was seen in 22 patients (31%) which was significantly associated with lymph node metastasis (p value < 0.05).On subgroup analyses significant association was observed between PR+ and absence of lymph node metastasis in cases of endometrioid cancer (p value < 0.05) . Nevertheless, there was no statistical significant association (P value .10) between ER receptors and lymph node metastasis in patients with endometrioid cancer. In non-endometrioid histology both ER- and PR- were found to have statistical significant lymph node involvement. Conclusions: Loss of ER and PR receptors independently predicts lymph node metastasis in endometrial cancers in African American females.