CD8A and colorectal cancer: Xian et al. found that the tumor-promoting effect of the lncRNA KCNQ1OT1 occurred through autocrine effects of colorectal cancer cell-derived exosomes (CRC-Exos), which mediated the miR-30a-5p/USP22 pathway to regulate the ubiquitination of PD-L1 and inhibit the CD8+ T-cell response, thereby promoting colorectal cancer development [51].