Further, they found that this is closely related to the gut microbiota of HBV+HCC patients, such that in HBV+HCC patients, Campilobacterota, Akkermaniacaeae and CD8+ T cells were positively correlated at the phylum level; and Prevotelaceae and CD8+ T cells were significantly and positively correlated at the family level.105. The gene discussed is CD8A; the disease is hepatocellular carcinoma.