CD8A and hepatocellular carcinoma: Low expression of CD8+NKT cells were linked with a higher risk of HCC in IVW analysis (OR 0.9996;95%CI 0.9993–0.9999; P = 0.0489), but MR-Egger analysis (OR0.9996;95%CI0.9972–1.0021; P = 0.8191) and WM analysis (OR0.9996; 95%CI0.9992–1.0000; P = 0.0531) showed no causal effect on HCC.