The proportion of CD3+CD8+ T cells in the PBMC in the DM‐CRC group significantly decreased compared with the proportion of CD3+CD8+ T cells in the CRC group (Figures 2B), while no obvious difference in the levels of CD3+CD4+ T cells and MAIT cells in the PBMC was found among different groups (Figure 2B). Here, CD4 is linked to colorectal carcinoma.