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Holland-Frei Cancer Medicine, Ninth Edition, offers a balanced view of the most current knowledge of cancer science and clinical oncology practice. This all-new edition is the consummate reference source for medical oncologists, radiation oncologists, internists, surgical oncologists, and others who treat cancer patients. A translational perspective throughout, integrating cancer biology with cancer management providing an in depth understanding of the disease An emphasis on multidisciplinary, research-driven patient care to improve outcomes and optimal use of all appropriate therapies Cutting-edge coverage of personalized cancer care, including molecular diagnostics and therapeutics Concise, readable, clinically relevant text with algorithms, guidelines and insight into the use of both conventional and novel drugs Includes free access to the Wiley Digital Edition providing search across the book, the full reference list with web links, illustrations and photographs, and post-publication updates

SummaryBackground Imatinib mesylate is a potent inhibitor of the Abl, KIT and platelet derived growth factor (PDGF) receptor tyrosine kinases. Preclinical data suggest that combining imatinib mesylate with anti-estrogen therapy may be synergistic in hormone receptor-positive breast cancer. We report results of the first phase II trial evaluating the efficacy of the novel combination of imatinib mesylate and letrozole in the treatment of postmenopausal women with metastatic breast cancer. Patients and Methods 45 postmenopausal women with hormone receptor-positive metastatic breast cancer whose tumors demonstrated c-kit and/or PDGFR-β positivity were treated with imatinib mesylate 400 mg PO twice daily and letrozole 2.5 mg PO once daily until disease progression or unacceptable toxicity. Results There were no complete responses and five partial responses for an objective response rate of 11%. An additional 16 patients had stable disease lasting at least 24 weeks for a clinical benefit rate of 46.7%. The median progression-free and overall survival was 8.7 months (95% confidence interval: 3.8–11.4 months) and 44.3 months (95% confidence interval: 34.0–55.3 months), respectively. The most common grade 3 or higher treatment related adverse events were fatigue and diarrhea, occurring in 9 (20%) and 7 patients (16%), respectively. Conclusion The combination of imatinib mesylate and letrozole is well tolerated but appears to have limited efficacy in the treatment of hormone receptor-positive metastatic breast cancer.