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Background  Tumor necrosis factor receptor 2 (TNFR2) promotes tumor cell proliferation, activates immunosuppressive cells, and supports immune escape. However, its role in non‐small cell lung cancer (NSCLC) has not been reported.    Methods  Quantitative real‐time PCR and Western blotting were used to evaluate TNFR2 in three NSCLC cell lines (A549, H1299, H1975) and normal lung epithelial cells (BEAS‐2B). TNFR2 was evaluated in 71 tumor tissues and 25 adjacent normal lung tissues by immunohistochemistry and analyzed with respect to clinical parameters.    Results  The messenger RNA and protein levels of TNFR2 were significantly higher in A549, H1299, and H1975 cells than in BEAS‐2B cells ( P  < 0.05) and differed significantly between NSCLC tissues and adjacent normal lung tissues by immunohistochemistry ( P  < 0.0001). TNFR2 is a independent prognostic factor in NSCLC. There have significantly differences in overall survival (OS) ( P  = 0.006) and disease‐free survival (DFS) ( P  = 0.000) of NSCLC patients between TNFR2 low expression groups and TNFR2 high expression group.    Conclusion  TNFR2 is expressed in human NSCLC tissues and cell lines and is related to poor prognosis. TNFR2 may represent a new auxiliary index for patients with NSCLC.

Expression of tumor necrosis factor receptor 2 in human non‐small cell lung cancer and its role as a potential prognostic biomarker