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  • Title: Expression of orphan GPR56 correlates with tumor progression in human epithelial ovarian cancer.
    Author: Liu Z, Huang Z, Yang W, Li Z, Xing S, Li H, Hu B, Li P.
    Journal: Neoplasma; 2017; 64(1):32-39. PubMed ID: 27881002.
    Abstract:
    G protein-coupled receptor 56 (GPR56) has been demonstrated to be a significant prognostic predictor in several types of malignances, including melanoma, glioblastoma, breast cancer, colon cancer, and pancreatic cancer. GPR56 has a putative mucin-like extracellular domain, indicating functions for this receptor in the cell-cell interactions and triggering different downstream signaling pathways responsible for regulating cell survival, proliferation, adhesion, and migration. But the expression and clinical significance of GPR56 has not been elucidated in epithelial ovarian cancer (EOC). We detected GPR56 expression by immunohistochemistry in 110 samples of ovarian serous carcinoma to explore the correlation between its expression and clinicopathologic characteristics and overall survival. As the result, we found that GPR56 expression is significantly associated with advanced FIGO stage (P = 0.01) and positive lymph node invasion (P = 0.016), and it serves as an independent unfavorable prognostic factor through univariate and multivariate analysis. GPR56 knockdown could dramatically decrease the proliferation and invasion of epithelial ovarian cancer cells through down-regulating the RhoA-GTP level and up-regulating the E-cadherin level, which indicates GPR56 could promote the progression and invasion of EOC. In conclusion, GPR56 expression was demonstrated as an independent prognostic factor in EOC, suggesting that GPR56 may play an oncogenic role through the Rho and E-cadherin pathway and GPR56 could be a novel potential drug target in EOC.
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