The result indicated that CMTM6 expression is correlated with lung cancers histotypes (higher CMTM6 in NSCLC than that in SCLC, P < 0.05) and inversely correlated with lymph nodes metastases (Chi-square test, P < 0.001), but not with patients’ age and gender (Fig. 3). This evidence concerns the gene CMTM6 and small cell lung carcinoma.