CTLA4 and posterior cortical atrophy: We analyzed the association of PCa immune checkpoint-related genes PD-1 (PDCD1), PD-L1 (CD274), CTLA4, PD-L2 (PDCD1LG2), IDO1, and VTCN1 with the risk score and hub genes (Figure 13A) and discovered that PD-1, CTLA4, and IDO1 were highly expressed in the high-risk group (Figure 13B), and the risk score was significantly positively correlated with PD-1, CTLA4, and IDO1 (Figure 13C).