INS and gastric adenocarcinoma: To further explore the clinical factors related to the OS prognosis of patients with STAD, we included the 7 key genes screened by the above lasso regression analysis (due to the expression level of INS in more than half of the samples in TCGA-STAD cohort was 0, it was not possible to separate the high and low expression groups for the next cox regression analysis) and a variety of clinical characteristics in the univariate and multifactorial cox regression analysis.