Abstract
Acyclic retinoid (ACR) has been shown to be a promising chemopreventive agent for hepatocellular carcinoma (HCC) after curative resection. The effects of retinoid are mediated by retinol-binding proteins (RBPs) through regulating cell proliferation and differentiation. This study investigated the clinical significance of RBP5 in HCC. RBP5 mRNA level was examined by real-time quantitative PCR on 52 matched tumor and adjacent non-tumor liver tissues, and on ten normal livers. Expression of RBP5 protein was examined using Western blotting analysis and immunohistochemistry. Down-regulation of RBP5 was found in HCC tissues at both mRNA and protein levels. Decreased RBP5 level was closely related to poor differentiation (P=0.02) and large tumor size (P=0.01). Low level of RPB5 was associated with poor overall survival (P=0.02), and was an independent prognostic factor for HCC. Our study revealed that RBP5 down-regulation in HCC was associated with aggressive tumor features, suggesting an important role of RPB5 in HCC progression.
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