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01.06.2014 | Hepatobiliary Tumors | Sonderheft 3/2014

Annals of Surgical Oncology 3/2014

Expression Analysis of THOP1 in Background Liver, a Prognostic Predictive Factor in Hepatocellular Carcinoma, Extracted by Multiarray Analysis

Zeitschrift:
Annals of Surgical Oncology > Sonderheft 3/2014
Autoren:
MD, PhD Shuji Nomoto, MD Mitsuhiro Hishida, MD Yoshikuni Inokawa, MD Nao Takano, MD, PhD Mitsuro Kanda, Yoko Nishikawa, MD, PhD Tsutomu Fujii, MD, PhD Masahiko Koike, MD, PhD Hiroyuki Sugimoto, MD, PhD Yasuhiro Kodera
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1245/​s10434-014-3581-1) contains supplementary material, which is available to authorized users.

Abstract

Background

Hepatocellular carcinoma (HCC) often recurs and multicentric occurrence is more common than intrahepatic metastases after surgery. Prognostic prediction is insufficient when considering only factors in resected primary tumor.

Methods

Control samples, termed supernormal (SN) liver, were taken from 11 cases of metastatic secondary malignancies of the liver. We selected adjacent nonneoplastic liver tissue from a patient with HCC and liver cirrhosis by hepatitis C (CN) for comparison. Expression profiling and methylation arrays were performed. We identified genes showing differences in both arrays. Prognosis was predicted for 179 cases of HCC based on gene expression.

Results

Expression profiling showed that expression of thimet oligopeptidase (THOP1) gene was decreased 4.119-fold in CN. Methylation array showed a higher value for CN (0.869) than SN (0.488). We studied THOP1 gene expression by real-time reverse transcriptase polymerase chain reaction. The average expression level of THOP1 (THOP1 value × 103/GAPDH) decreased in matching normal tissue (14.53 ± 10.14) relative to SN (78.14 ± 44.50). The group with higher than average THOP1 expression (n = 74) showed significant correlations with prolonged survival (P = 0.0383). Strongly reduced THOP1 expression (<3.0, n = 50) was shown to be an independent prognostic factor by multivariate analysis (P = 0.0024).

Conclusions

Expression of the THOP1 gene in the background liver of HCC is likely to be a good biomarker for risk of HCC development. When assessing HCC, it is important to extract prognostic factors from background liver tissue as well as considering malignant factors of the primary cancer lesion.

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