IL1R2 and lung cancer: -Association of rs3218977‐GG with a decreased risk of lung cancer-Significant risk-increasing effect of rs2072472 in the dominant model-rs2072472 as the most influential risk factor of lung cancer-Downregulation of IL‐1R2 mRNA level in lung cancer patients-Association between high expression of IL‐1R2 and a poor prognosis in lung cancer