Overexpression of pituitary tumor transforming gene 1 in HCC is associated with angiogenesis and poor prognosis

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
Tsutomu FujiiAkimasa Nakao

Abstract

The pituitary tumor transforming gene 1 (PTTG1) protein is cell-cycle regulated and is identified as a human securin that inhibits sister chromatid separation and is involved in transformation and tumorigenesis. PTTG1 has very low or undetectable expression in most normal human tissues, but it is abundantly expressed in malignant cell lines and pituitary tumors. In this study, we investigated human PTTG1 expression in 62 hepatocellular carcinoma (HCC) specimens using quantitative real-time reverse transcription polymerase chain reaction analysis. We found that, compared with corresponding noncancerous liver tissues, PTTG1 was remarkably overexpressed in HCCs (PTTG1/beta-actin; 0.443 +/- 0.073 vs. 0.068 +/- 0.007; P < .0001). Furthermore, we found a significant correlation between PTTG1 expression and serum alpha-fetoprotein level (P < .001). Univariate and multivariate analyses revealed that the PTTG1 messenger RNA (mRNA) expression was an independent prognostic factor for disease-free (odds ratio 2.70; P = .037) and overall (odds ratio 5.35; P = .007) survival. Moreover, we discovered a significant relationship between PTTG1 expression and intratumoral microvessel density. Our data supported an important role for PTTG1-mediate...Continue Reading

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