Figure 5. Correlation between POSTN expression and immune infiltration. The correlations between POSTN expression and immune cells infiltration in LUSC and LUAD (A and B). POSTN is significantly associated with cancer purity and positively correlates with the infiltration of different immune cells in LUAD and LUSC using the TIMER database (C). The correlations between POSTN expression and checkpoint in LUSC and LUAD, including CD274, PDCD1, and CTLA-4 (D–I). *p < 0.05, **p < 0.01, ***p < 0.001.