ABCA1 and gastric adenocarcinoma: To further explore the molecular functions played by ABCA1 in STAD, we divided the samples in the TCGA-STAD cohort into high and low expression groups based on the expression levels of ABCA1 and analyzed the DEGs between the two groups, including 2241 genes with up-regulated expression and 59 genes with down-regulated expression (Figures 9A, B).