In colon adenocarcinoma, mRNA expression of CCNA2 correlated with the infiltration levels of B cell (cor = 0.194, p = 8.78e-5), CD8+ T cell (cor = 0.259, p = 1.19e-7), neutrophil (cor = 0.237, p = 1.56e-6), and dendritic cell (cor = 0.169, p = 6.76e-4); in rectum adenocarcinoma, mRNA expression of CCNA2 correlated with the infiltration levels of CD8+ T cell (cor = 0.269, p = 1.36e-3), CD4+ T cell (cor = −0.315, p = 1.55e-4), macrophage (cor = −0.200, p = 1.83e-2), and neutrophil (cor = 0.181, p = 3.41e-2) (Fig. 2A). Here, CD8A is linked to rectum adenocarcinoma.