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World J Mens Health. 2013 Apr;31(1):36-46. doi: 10.5534/wjmh.2013.31.1.36. Epub 2013 Apr 23.

Clinical Significance of Wnt/β-Catenin Signalling and Androgen Receptor Expression in Prostate Cancer.

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1
Department of Pathology, Inje University College of Medicine, Busan, Korea.

Abstract

PURPOSE:

To investigate the relationships among the Wnt/β-catenin pathway, androgen receptor (AR), and clinicopathological factors in hormone-naïve prostate cancer.

MATERIALS AND METHODS:

This study was conducted with132 cases of hormone-naïve prostate cancer treated by prostatectomy and prostate needle biopsy. An immunohistochemical study using antibodies against β-catenin, matrix metalloproteinase-7 (MMP-7), and the AR was performed. For the in vitro study, PC-3, LNCaP, 22Rv1, and DU145 cell lines were used.

RESULTS:

The clinical or pathological stage ware a localized cancer in 36 patients (27.3%), locally advanced cancer in 31 (23.5%), and metastatic cancer in 65 (49.2%). We detected increased β-catenin, AR, and MMP-7 expression with a high Gleason grade, disease progression, and increasing serum prostate-specific antigen (PSA) levels (p<0.01). In Spearman's rank correlations, the expression of cytoplasmic β-catenin, MMP-7, and the AR were found to be significantly positively correlated. In addition, the expression of β-catenin, MMP-7, and the AR were significantly correlated with clinicopathological variables indicative of a poor prognosis. Forty-nine patients with primary androgen deprivation had short response durations from hormone therapy to PSA progression with elevated MMP-7 expression on the Kaplan-Meier curve (p=0.0036).

CONCLUSIONS:

These data show that an activated Wnt/β-catenin pathway and AR expression in prostate cancer are correlated with metastasis and aggressiveness. In addition, the expression of MMP-7 protein, a target of the Wnt/β-catenin pathway, is associated with PSA progression in prostate cancer patients undergoing primary hormone therapy.

KEYWORDS:

Beta catenin; Matrix metalloproteinases; Prognosis; Prostate neoplasms; Receptors, androgen

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