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The role of prolyl hydroxylase domain protein 2 (PHD2) in carcinogenesis has been studied in a variety of cancer types. However, the association between PHD2 and human hepatocellular carcinoma (HCC) has not been documented.  A total of 220 patients with primary HCC who underwent a curative liver resection were enrolled in this study. The tumor samples were obtained during the surgical procedure from each patient for PHD2 immunohistological staining. All the patients were followed up and the disease-free survival (DFS) and overall survival (OS) were evaluated.  We found that that high PHD2 expression was significantly associated with higher stage (stages III + IV) (odds ratio [OR] = 5.576,  P  < 0.001), larger tumor size (>5 cm) (OR = 6.176,  P  < 0.001), poorer tumor differentiation (OR = 1.424,  P  = 0.003), and higher serum alpha fetoprotein (AFP) level (OR = 6.861,  P  < 0.001). Compared to those with high PHD2 expressions, patients with low PHD2 expression had significantly longer DFS and OS periods (both  P  < 0.001). Cox regression analyses revealed that higher levels of PHD2, tumor size, tumor stage, as well as serum AFP level were predictors for a worse prognosis in patients with HCC.  PHD2 expression in the tumors is associated with the clinical features and prognosis of patients with HCC; it may be used as a histological marker for HCC.

Tumor PHD2 Expression Is Correlated With Clinical Features and Prognosis of Patients With HCC Receiving Liver Resection