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Phase II trial of dolastatin-10 in patients with advanced breast cancer

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Summary

Purpose: Phase II multicenter cooperative group study investigated the efficacy and toxicity of the novel anti-microtubule agent dolastatin-10 in patients with advanced breast cancer.

Patient and methods: Twenty-one patients with measurable metastatic breast cancer were treated with dolastatin-10 at a dose of 400 mcg/m2 by intravenous bolus once every 3 weeks. Patients must have received a total of 1 or 2 prior chemotherapy regimens and have an Eastern Cooperative Oncology Group performance status of 0–2. Patients received this treatment as either a first (n = 11) or second-line (n = 10) chemotherapy for metastatic disease. Eighteen patients (86%) had received a prior anthracycline. The National Cancer Institute provided the dolastatin-10.

Results: One out of 21 patients (5%; 95% CI: 0–24%) achieved a partial remission for a duration of 113 days. Four patients maintained stable disease for a median of 87 days. A total of 58 courses of dolastatin-10 were administered. Patients received a median of two cycles of dolastatin-10. Hematologic toxicity was moderate, with 8 patients developing grade 4 neutropenia, and 5 with grade 3 neutropenia; one grade 3 febrile neutropenia was observed. These episodes of grade 3 and 4 neutropenia were experienced on 36% of the treatment cycles. Non-hematologic toxicity was uncommon.

Conclusion: While the toxicity profile of dolastatin-10 was acceptable, it had minimal activity in this advanced breast cancer study. We are not pursuing further clinical trials of this agent in the setting of advanced breast cancer.

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Correspondence to Edith A. Perez MD.

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Perez, E.A., Hillman, D.W., Fishkin, P.A. et al. Phase II trial of dolastatin-10 in patients with advanced breast cancer. Invest New Drugs 23, 257–261 (2005). https://doi.org/10.1007/s10637-005-6735-y

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  • DOI: https://doi.org/10.1007/s10637-005-6735-y

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