Abstract:
BACKGROUND:TRAIL (tumor necrosis factor related apoptosis-inducing ligand) is involved in tumor immune surveillance and, thus, may be a potential cancer therapy. TRAIL expression in the tumor microenvironment has been shown to impact cancer survival in multiple tumor types, including ovarian cancer. We studied TRAIL expression and outcomes in patients with prostate cancer. METHODS:A tissue microarray (TMA) of 200 prostate cancer patients and benign prostate tissue controls was used to assess the epithelial and stromal protein expression of TRAIL, death receptors (DR4 and DR5), decoy receptors (DcR1 and DcR2), and the FLICE inhibitory protein (FLIP(L) ). We correlated these expression patterns with clinicopathological parameters and determined its impact on recurrence-free survival. RESULTS:Nearly all (99.5%) prostate cancer tissues examined displayed either decreased expression of pro-apoptotic TRAIL receptors, increased FLIP(L) expression, or both. We observed elevated death receptor, decoy receptor, FLIP(L) , and epithelial TRAIL expression in prostate cancer epithelium. TRAIL expression in the stromal tumor microenvironment surrounding the prostate cancer was markedly lower. Elevated TRAIL expression in the tumor microenvironment was also significantly associated with increased recurrence-free survival (P = .014), after controlling for other prognostic markers. In contrast, epithelial expression of TRAIL did not have an effect on overall survival. CONCLUSIONS:Expression of the components of the pro-apoptotic TRAIL pathway is altered in prostate cancer. Moreover, TRAIL expression in the tumor microenvironment may affect recurrence-free survival rate of prostate cancer patients. Consequently, these results may be useful in devising future therapeutic strategies targeting the TRAIL pathway in prostate cancer.
journal_name
Cancerjournal_title
Cancerauthors
Anees M,Horak P,El-Gazzar A,Susani M,Heinze G,Perco P,Loda M,Lis R,Krainer M,Oh WKdoi
10.1002/cncr.25504subject
Has Abstractpub_date
2011-03-15 00:00:00pages
1172-82issue
6eissn
0008-543Xissn
1097-0142journal_volume
117pub_type
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