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Activated Mammalian Target of Rapamycin Is an Adverse Prognostic Factor in Patients with Biliary Tract Adenocarcinoma
Purpose: The mammalian target of rapamycin (mTOR) is a protein kinase that plays a key role in cellular growth and homeostasis. Because its regulation is frequently altered in tumors, mTOR is currently under investigation as a potential target for anticancer therapy. The purpose of our study was to...
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Published in: | Clinical cancer research 2007-08, Vol.13 (16), p.4795-4799 |
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Main Authors: | , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Purpose: The mammalian target of rapamycin (mTOR) is a protein kinase that plays a key role in cellular growth and homeostasis. Because
its regulation is frequently altered in tumors, mTOR is currently under investigation as a potential target for anticancer
therapy. The purpose of our study was to determine the prognostic value of activated mTOR (p-mTOR) in patients with biliary
tract adenocarcinoma (BTA), in order to strengthen the rationale for targeted therapy of BTA using mTOR inhibitors.
Experimental Design: We determined expression of p-mTOR in paraffin-embedded surgical specimens of BTA by immunohistochemistry with a monoclonal
antibody to phosphorylated mTOR. Overall survival was analyzed with a Cox model adjusted for clinical and pathologic factors.
Results: Immunostaining for p-mTOR was positive in 56 of 88 (64%) tumors. Activated mTOR was not associated with any of the clinical
or pathologic variables of the patients but predicted overall survival of the patients. Overall survival was significantly
shorter in patients with p-mTOR–positive tumors as compared with patients with p-mTOR–negative tumors (hazard ratio for death
2.57; 95% confidence interval, 1.35-4.89; P = 0.004). Multivariate Cox proportional hazards regression analyses identified p-mTOR to be an independent prognostic factor
for death (adjusted hazard ratio for death, 2.44; 95% confidence interval, 1.24-4.80; P = 0.01).
Conclusions: Patients with BTA and p-mTOR–positive tumors have a significantly shorter overall survival than patients with p-mTOR–negative
tumors and may benefit from targeted therapy with mTOR inhibitors in the future. |
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ISSN: | 1078-0432 1557-3265 |
DOI: | 10.1158/1078-0432.CCR-07-0738 |