HIF1A and hepatocellular carcinoma: Numerous studies have identified PROX1 as an important promoter of HCC angiogenesis,19, 20 and the levels of PROX1 were positively correlated with HIF‐1α protein stability.21 Therefore, we speculated that PROX1 could maintain accumulation of HIF‐1α in LSECs and promote LSEC angiogenesis.