To confirm the above results, the protein expressions of PTEN in NSCLC tissues and pericarcinomatous tissues were detected using Western blot assay, the results revealed that PTEN was observably reduced in cancer tissues (Figure 11B,C), and the expression levels of PTEN were negatively correlated with miR‐20a expression levels (Figure 11D). The gene discussed is PTEN; the disease is non-small cell lung carcinoma.