GPR30: a novel indicator of poor survival for endometrial carcinoma

Objective This study was undertaken to evaluate the relationship between GPR30, classical steroidal receptor expression, and clinical outcome in patients with endometrial carcinoma. Study Design Immunohistochemistry was used to investigate the expression of GPR30, estrogen, progesterone, epidermal growth factor receptors and Ki-67 in 47 consecutive consenting patients with endometrial carcinoma diagnosed between 1997 and 2001. Results were correlated with clinical and pathologic predictors of adverse outcome and survival. Results GPR30 correlated positively with epidermal growth factor receptor ( P = .005), but negatively with progesterone ( P = .05) receptor expression. GPR30 overexpression occurred more frequently in tumors with deep myometrial invasion, high-grade, biologically aggressive histologic subtypes, and advanced stage. In patients with GPR30 overexpression, survival was significantly poorer (65.2% vs 100%, P = .005). Conclusion GPR30 represents an alternative estrogen-responsive receptor that is overexpressed in tumors where estrogen and progesterone receptors are downregulated, and in high-risk endometrial cancer patients with lower survival rates.