CD8A and neoplasm: The expression level of SLC7A11 had obviously positive correlation with infiltrating levels of CD8+ T cells (r = 0.358, p = 1.03e-13), neutrophils (r = 0.267, p = 5.72e-08), and dendritic cells (r = 0.171, p = 5.65e-04) in COAD, but it was negatively correlated with tumor purity (r = -0.104, p = 3.59e-02) (Figure 3).