In addition, we divided patients with GC into high- and low-CHN1 expression groups, and found that CD274, CTLA4, HAVCR2, LAG3, PDCD1, PDCD1LG2, and TIGIT were differentially expressed in the high/low-CHN1 expression group (Figure 7(c)). This evidence concerns the gene CTLA4 and gastric cancer.