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Ref Type Journal Article
PMID (15803362)
Authors Modi S, Seidman AD, Dickler M, Moasser M, D'Andrea G, Moynahan ME, Menell J, Panageas KS, Tan LK, Norton L, Hudis CA
Title A phase II trial of imatinib mesylate monotherapy in patients with metastatic breast cancer.
Journal Vol Issue Date Pages Journal Short Title
Breast cancer research and treatment 90 2 2005 Mar 157-63 Breast Cancer Res Treat
URL
Abstract Text Imatinib mesylate is a potent inhibitor of Abl, KIT, and PDGFR tyrosine kinases. Breast cancer has variable expression of KIT and PDGFR therefore we conducted a phase II trial to evaluate the safety and efficacy of imatinib in patients with metastatic breast cancer (MBC).Eligible patients had measurable and progressive MBC, with no limits on prior chemo- or hormonal therapy. Imatinib was initially administered at a dose of 400 mg orally twice a day with provisions for dose reductions based on toxicities. The primary endpoint was clinical benefit based on RECIST criteria. Tumor specimens were tested for expression of KIT and PDGFR tyrosine kinases.Sixteen patients were enrolled and treated. Median age was 55 years (range: 35-73); median number of prior chemotherapy regimens for MBC was 4 (range 1-8). The main non-hematologic toxicities were (Grades 1/2; Grade 3): fatigue (56%; 6%), edema (38%; 19%), nausea (31%; 19%), vomiting (38%; 0%), anorexia (38%; 0%), diarrhea (19%; 6%), and rash (25%; 6%). Grade 3/4 hematologic and biochemical abnormalities were minimal. There was no evidence of clinical benefit. The median duration of therapy on trial was 28 days (range 2-71). Of the 13 testable cases: 1 was KIT positive and 4 were PDGFR positive.Imatinib therapy at doses of 800 mg/day was associated with significant toxicity in patients with heavily pre-treated MBC. Our results do not indicate activity for imatinib monotherapy in these unselected patients.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References