Summary
Purpose. Dasatinib is an oral tyrosine kinase inhibitor (TKI) of BCR-ABL and SRC family and ixabepilone is an epothilone B analog. Synergistic activity has been reported when combining dasatinib with chemotherapy. This study was conducted to determine the dose-limiting toxicities (DLTs) and the maximum tolerated doses (MTDs) for this combination. Patients and methods. Patients with metastatic solid tumors who progressed on standard therapy received dasatinib orally daily and ixabepilone IV every 3 weeks at escalating doses using 3 + 3 design. An expansion cohort was studied after reaching the MTD. Pharmacokinetic studies were performed. Results. Nineteen patients were enrolled. No DLTs were observed at dose level (DL) 1 (dasatinib 100 mg and ixabepilone 30 mg/m2). At DL 2 (dasatinib 100 mg and ixabepilone 40 mg/m2), one patient had multiple DLTs. At DL 3 (dasatinib 150 mg and ixabepilone 40 mg/m2), the first patient developed grade 3 AE during cycle 2, the second patient had a DLT and a grade 3 AE during cycle 2. The accrual to DL 3 was halted without reaching the maximally administered dose (MAD) and MTDs were determined to be dasatinib 100 mg and ixabepilone 40 mg/m2 (DL 2). One patient had a partial response and 12 patients stable disease as their best response. Fourteen patients came off study due to toxicities. Conclusion. The combination of dasatinib and ixabepilone showed modest clinical activity with doses 100 mg orally daily and 40 mg/m2 IV every 3 weeks, respectively. Treatment related toxicities were seen frequently.
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Acknowledgements
The contribution of Kristin Ferguson, a research nurse, is gratefully acknowledged.
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This work was supported by Bristol-Myers Squibb.
Disclosures
Dr. Sandra M. Swain has received research funding from Bristol-Myers Squibb and travel support from Sanofi-Aventis. Dr. Swain is involved in the advisory boards (uncompensated) for Sanofi-Aventis and Roche (Genentech).
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Herbolsheimer, P., Kapoor, R., Smith, K.L. et al. Phase I trial of dasatinib and ixabepilone in patients with solid tumors. Invest New Drugs 31, 92–98 (2013). https://doi.org/10.1007/s10637-012-9805-y
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DOI: https://doi.org/10.1007/s10637-012-9805-y