Among them, the tumor-promoting effect of lncRNA KCNQ1OT1 is through the autocrine effect of tumor cell-derived exosomes, which mediates the miR-30a-5p/USP22 pathway to regulate the ubiquitination of PD-L1 and inhibits CD8+ T-cell response, thereby promoting CRC development (Figure 10). This evidence concerns the gene CD8A and colorectal carcinoma.