CD8A and cancer: In colon adenocarcinoma (COAD) and stomach adenocarcinoma (STAD), patients with high‐MSI cancer (MSI‐H) showed a significantly higher infiltration of antitumor and tumor helper cells, such as Tc, γδ T, NK, and DC (Figure S6a, Supporting Information), but a significantly lower infiltration of tumor suppressor cells (Tr1 and neutrophils) and CD8 naïve cells (Figure S6b, Supporting Information).