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Rich66 · 04-12-2009, 01:09 AM

1: J Clin Oncol. 2009 Apr 6. [Epub ahead of print] Links: Phase II Study of Eribulin Mesylate, a Halichondrin B Analog, in Patients With Metastatic Breast Cancer Previously Treated With an Anthracycline and a Taxane.

Vahdat LT, Pruitt B, Fabian CJ, Rivera RR, Smith DA, Tan-Chiu E, Wright J, Tan AR, Dacosta NA, Chuang E, Smith J, O'Shaughnessy J, Shuster DE, Meneses NL, Chandrawansa K, Fang F, Cole PE, Ashworth S, Blum JL.
Weill Cornell Medical College, New York; State University of New York Upstate Medical University, Syracuse; and Stony Brook University Hospital, Stony Brook, NY; Harrington Cancer Center, Amarillo; El Paso Cancer Center, Texas Oncology PA and US Oncology, EI Paso; Baylor Charles A. Sammons Cancer Center, Texas Oncology PA and US Oncology, Dallas, TX; University of Kansas Medical Center, Kansas City, KS; Northwest Cancer Specialists, Vancouver, WA; Florida Cancer Research Institute, Davie, FL; Cancer Institute of New Jersey, New Brunswick; and Eisai Medical Research Inc, Ridgefield Park, NJ.
PURPOSE: Eribulin mesylate (E7389), a nontaxane microtubule dynamics inhibitor, is a structurally simplified, synthetic analog of the marine natural product halichondrin B. This open-label, single-arm, phase II study evaluated efficacy and tolerability of eribulin in heavily pretreated patients with metastatic breast cancer (MBC). METHODS: MBC patients who were previously treated with an anthracycline and a taxane received eribulin mesylate (1.4 mg/m(2)) as a 2- to 5-minute intravenous (IV) infusion on days 1, 8, and 15 of a 28-day cycle. Because of neutropenia (at day 15), an alternative regimen of eribulin on days 1 and 8 of a 21-day cycle was administered. The primary end point was overall response rate. RESULTS: Of the 103 patients treated, the median number of prior chemotherapy regimens was four (range, one to 11 regimens). In the per-protocol population (n = 87), eribulin achieved an independently reviewed objective response rate (all partial responses [PRs]) of 11.5% (95% CI, 5.7 to 20.1) and a clinical benefit rate (PR plus stable disease >/= 6 months) of 17.2% (95% CI, 10.0 to 26.8). The median duration of response was 171 days (5.6 months; range, 44 to 363 days), the median progression-free survival was 79 days (2.6 months; range, 1 to 453 days), and the median overall survival was 275 days (9.0 months; range, 15 to 826 days). The most common drug-related grades 3 to 4 toxicities were as follows: neutropenia, 64%; leukopenia, 18%; fatigue, 5%; peripheral neuropathy, 5%; and febrile neutropenia, 4%. CONCLUSION: Eribulin demonstrated activity with manageable tolerability (including infrequent grade 3 and no grade 4 neuropathy) in heavily pretreated patients with MBC when dosed as a short IV infusion on days 1 and 8 of a 21-day cycle.

04-12-2009, 01:09 AM	#2
Rich66 Senior Member Join Date: Feb 2008 Location: South East Wisconsin Posts: 3,431	1: J Clin Oncol. 2009 Apr 6. [Epub ahead of print] Links Phase II Study of Eribulin Mesylate, a Halichondrin B Analog, in Patients With Metastatic Breast Cancer Previously Treated With an Anthracycline and a Taxane. Vahdat LT, Pruitt B, Fabian CJ, Rivera RR, Smith DA, Tan-Chiu E, Wright J, Tan AR, Dacosta NA, Chuang E, Smith J, O'Shaughnessy J, Shuster DE, Meneses NL, Chandrawansa K, Fang F, Cole PE, Ashworth S, Blum JL. Weill Cornell Medical College, New York; State University of New York Upstate Medical University, Syracuse; and Stony Brook University Hospital, Stony Brook, NY; Harrington Cancer Center, Amarillo; El Paso Cancer Center, Texas Oncology PA and US Oncology, EI Paso; Baylor Charles A. Sammons Cancer Center, Texas Oncology PA and US Oncology, Dallas, TX; University of Kansas Medical Center, Kansas City, KS; Northwest Cancer Specialists, Vancouver, WA; Florida Cancer Research Institute, Davie, FL; Cancer Institute of New Jersey, New Brunswick; and Eisai Medical Research Inc, Ridgefield Park, NJ. PURPOSE: Eribulin mesylate (E7389), a nontaxane microtubule dynamics inhibitor, is a structurally simplified, synthetic analog of the marine natural product halichondrin B. This open-label, single-arm, phase II study evaluated efficacy and tolerability of eribulin in heavily pretreated patients with metastatic breast cancer (MBC). METHODS: MBC patients who were previously treated with an anthracycline and a taxane received eribulin mesylate (1.4 mg/m(2)) as a 2- to 5-minute intravenous (IV) infusion on days 1, 8, and 15 of a 28-day cycle. Because of neutropenia (at day 15), an alternative regimen of eribulin on days 1 and 8 of a 21-day cycle was administered. The primary end point was overall response rate. RESULTS: Of the 103 patients treated, the median number of prior chemotherapy regimens was four (range, one to 11 regimens). In the per-protocol population (n = 87), eribulin achieved an independently reviewed objective response rate (all partial responses [PRs]) of 11.5% (95% CI, 5.7 to 20.1) and a clinical benefit rate (PR plus stable disease >/= 6 months) of 17.2% (95% CI, 10.0 to 26.8). The median duration of response was 171 days (5.6 months; range, 44 to 363 days), the median progression-free survival was 79 days (2.6 months; range, 1 to 453 days), and the median overall survival was 275 days (9.0 months; range, 15 to 826 days). The most common drug-related grades 3 to 4 toxicities were as follows: neutropenia, 64%; leukopenia, 18%; fatigue, 5%; peripheral neuropathy, 5%; and febrile neutropenia, 4%. CONCLUSION: Eribulin demonstrated activity with manageable tolerability (including infrequent grade 3 and no grade 4 neuropathy) in heavily pretreated patients with MBC when dosed as a short IV infusion on days 1 and 8 of a 21-day cycle.