CNN1 and gastric cancer: To further investigate the functional enrichment of CNN1 in GC, we used the ggplot2 package (version 3.3.3) to perform a single gene differential analysis and visualize the results for the following four gene sets: VECCHI_GASTRIC_CANCER_EARLY_DN, VECCHI_GASTRIC_CANCER_ADVANCED_VS_EARLY_UP, WP_ANGIOGENESIS, and VEGF_A_UP.V1_UP, which are the normal tissue and early GC expression downregulated gene set, expression upregulated gene set in early GC versus advanced gastric cancer, angiogenesis-related gene set, and upregulated gene set in HUVEC cells (endothelium) treated with VEGFA, respectively.