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Background  POTEE (POTE ankyrin domain family, member E) is a newly identified cancer-testis antigen that has been found to be expressed in a wide variety of human cancers including cancers of the colon, prostate, lung, breast, ovary, and pancreas.    Aim  To measure the serum levels of POTEE in patients with non-small-cell lung cancer (NSCLC) and to explore the clinical significance of POTEE in NSCLC.    Patients and Methods  104 NSCLC patients, 66 benign lung disease patients and 80 healthy volunteers were enrolled in this study from May 2013 to February 2014. Serum POTEE levels were measured using enzyme-linked immunosorbent assay (ELISA). Numerical variables were recorded as means ± standard deviation (SD) and analyzed by independent  t  tests. Categorical variables were calculated as rates and were analyzed using a χ 2  test or Fisher’s exact test. Survival curves were estimated and compared using the Kaplan-Meier method and log-rank tests.    Results  Serum POTEE levels were significantly higher in NSCLC patients than in benign lung disease patients and healthy controls (mean ± SD [pg/ml], 324.38± 13.84 vs. 156.93 ± 17.38 and 139.09 ± 15.80,  P <0.001) and were significantly correlated with TNM stage. Survival analysis revealed that patients with low serum POTEE had longer progression-free survival (PFS) than those with high serum POTEE ( P =0.021). Cox multivariate analysis indicated that POTEE was an independent prognostic factor of progression-free survival ( P  =0.009, hazard ratio, 2.440).    Conclusions  Serum POTEE level in NSCLC patients is associated with TNM stage and is a potential prognostic factor.

Serum Levels of the Cancer-Testis Antigen POTEE and Its Clinical Significance in Non-Small-Cell Lung Cancer