PARK7 and hepatocellular carcinoma: In this study, we first analyzed the expression level of DJ-1 in TCGA database and clinical HCC tissue samples, and the results showed that the expression of DJ-1 in TCGA database and HCC tissue samples was significantly higher than that of normal tissues and paracancerous tissues, and was closely related to the clinical stage T (T1T2 vs T3T4), pathological grade (I II vs III IV).