Combined with the clinical data, we also conducted survival analysis to examine the potential associations between the expression of XCL1 and CD8 and survival of patients in TCGA-LIHC cohort, suggesting that high mean of expression of XCL1 and CD8 (n = 181, TPM value > 1.224) is positively correlated with better prognosis of HCC. The gene discussed is CD8A; the disease is hepatocellular carcinoma.