In HCC, we observed increased expression of several more activation- (IFNG, CD38, IL2RA, TNFRSF9) and exhaustion-related (TIGIT, CTLA4, PDCD1, ENTPD1) genes in tumor MAIT cells (Figures 3A–C). The gene discussed is TNFRSF9; the disease is hepatocellular carcinoma.