As shown in Tables 3, 4, the correlation between the expression of PEA3 members and immune marker genes of different immune cells including CD8+ T cells, T cells (general), B cells, monocytes, neutrophils, NK cells, DCs, Th1 cells, Th2 cells, Tfh cells, Th17 cells, Treg and exhausted T cells, TAMs, M1 and M2 macrophages, and CAFs in COAD and READ was investigated in TIMER and GEPIA. The gene discussed is CD8A; the disease is colon adenocarcinoma.