Figure 2. Differentially expressed cuproptosis-related immune genes (CRIGs) in gastric cancer (GC). (A) Heatmap of differentially expressed genes in GC. (B) Results of PCA analysis between GC and normal gastric tissues. (C) Venn diagram of differentially expressed genes and immune-related genes. (D) Correlation between immune-related genes and cuproptosis-related genes (pink, orange, and green represent cuproptosis-related genes, IRGs positively related to the cuproptosis and IRGs negatively related to the cuproptosis).