TP53 and hepatocellular carcinoma: Prognostic PRGs stratified HCC into two distinct subtypes, the cluster 1 had a poor prognosis and was characterized by high alpha fetoprotein level, poor differentiation, advanced tumor stage, large tumor size, frequent TP53 mutation, up-regulation of cell cycle- and mitosis-associated genes, which was similar to the aggressive proliferation subtype of HCC.