CD8A and neoplasm: In addition, analyses of the correlations of the PDGFRA expression level with tumor purity and CD8+ T cell infiltration revealed that PDGFRA expression was strongly positively associated with CD8+ T cell infiltration in PDAC according to TIMER (Rho = 0.771, p = 5.50e − 35), MCPcounter (Rho = 0.553, p = 6.57e − 14), and quanTIseq (Rho = 0.544, p = 1.55e − 14) (Figure 2(c)).