Abstract
To determine, in preclinical in vivo animal and in clinical studies, whether raloxifene (a selective oestrogen-receptor (ER) modulator that targets ER-beta and induces apoptosis in vitro in androgen-independent prostate cancer, AIPC cells) affects prostate cell differentiation, proliferation and carcinogenesis, and in the pilot phase II clinical trial, the response rate and duration of patients with AIPC treated with a daily oral dose of raloxifene. Tumour proliferation rate in response to raloxifene treatment, and molecular markers of cell cycle and apoptosis, were evaluated in established ER-beta-positive androgen-dependent (AD) CWR22 and AI CWRSA9 human xenograft prostate cancer models. Twenty-one patients with AIPC and evidence of disease progression were enrolled into the clinical trial and given daily oral raloxifene. There was significant growth inhibition by raloxifene in the ADPC and AIPC xenograft models (CWR22 68%, P < 0.010; CWRSA9 64%, P < 0.001), with no tumour regression. There was evidence of G1 arrest by increased p27kip1 expression in the raloxifene-treated group. Eighteen patients comprised the efficacy analysis, as three withdrew before the first evaluation. At the first evaluation, five men had stable disea...Continue Reading
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