The relationship between tumor immune microenvironment and the risk signature. (A), The relationship between risk score and immune-related scores in CHOL samples. (B–C), Comparison of immune-related pathways between the low- and high-risk groups. (D–E), The proportion of infiltrating immune cells between the high- and low-risk groups calculated by CIBERSORT algorithm. (F), Comparison of the expression levels of immune checkpoint key molecules in the low- and high-risk groups. (G–I), Correlation between the risk score and immune cells. ***p < 0.001; **p < 0.01; *p < 0.05.