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Aberrant expression of human leukocyte antigens (HLA) class I has prognostic importance in various cancers. Here, we evaluated the prognostic value of classical (A/B/C) and nonclassical (G/E) HLA expression in 169 high grade epithelial ovarian cancer samples and linked that to clinicopathological characteristics and survival. Expression of HLA-A, -B/C, or -E was not correlated with survival. Survival was prolonged when tumours expressed HLA-G ( P  = 0.008) and HLA-G was an independent predictor for better survival ( P  = 0.011). In addition, HLA-G expression was associated with longer progression-free survival ( P  = 0.036) and response to chemotherapy ( P  = 0.014). Accordingly, high expression of HLA-G mRNA was associated with prolonged disease-free survival ( P  = 0.037) in 65 corresponding samples. Elevated serum-soluble HLA-G levels as measured by enzyme-linked immunosorbent assay in 50 matched patients were not correlated to HLA-G protein expression or gene expression nor with survival. During treatment, sHLA-G levels declined ( P  = 0.038). In conclusion, expression of HLA-G is an independent prognostic factor for improved survival in high grade epithelial ovarian cancer and a predictor for platinum sensitivity.

HLA-G Expression Is an Independent Predictor for Improved Survival in High Grade Ovarian Carcinomas