Additionally, lung tumor tissues from LUAD, LUSC, and SCLC patients with the TT genotype exhibited notably elevated EGFR levels compared to those with CC and CT genotypes, and that EGFR over expression has been demonstrated to be involved in numerous EGFR over expression is involved in the formation and progression of many malignant solid tumors, which effectively validates the TT genotype as an independent prognostic risk factor in this study. Here, EGFR is linked to small cell lung carcinoma.