Proline-directed protein kinase FA is a powerful and independent prognostic predictor for progression and patient survival of hepatocellular carcinoma

Abstract

Purpose: Molecular, cellular, and animal studies have established that overexpressed proline-directed protein kinase FA (PDPK FA) is essential for the development of tumorigenesis, invasion, and metastasis of human cancer cells. However, the prognostic role of PDPK FA in cancer patients remains largely unknown. In this study, association of PDPK F A expression with poor prognosis of hepatocellular carcinoma (HCC) patients was examined. Patients and Methods: PDPK FA expression in the resected tumors of 134 HCC patients (112 men and 22 women) with ages ranging from 33 to 83 years (mean, 55 years) was analyzed by immunohistochemistry. Highly condensed cytoplasmic and nuclear PDPK FA associated with tumor cells was used as the major scoring parameter for positive PDPK F A expression. Results: Approximately 68% of the patients (91 of 134) exhibited positive PDPK FA expression. Patients with positive PDPK FA showed poorer disease-free survival and overall survival (P < .001). Cox multivariate regression analysis further established PDPK F A as the strongest independent prognosticator for progression and patient survival of HCC (hazard ratio [HR], 2.878; 95% CI, 1.634 to 5.067 for disease-free survival; and HR, 5.035; 95% CI, 2.137 to 11.866 for overall survival;