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Eribulin Mesylate Demonstrated Anti-Tumor Activity in Heavily Pretreated Patients with Advanced Breast Cancer
Date:5/15/2008

ed a median of four cycles of eribulin mesylate (range 1-27). No premedication to prevent hypersensitivity was required.

Two-hundred sixty-nine patients met the key inclusion criteria. In patients who received a median of four cycles of eribulin mesylate, Overall Response Rate (ORR) by Independent Review (IR) was 9.3% (all Partial Responses (PR); 95% confidence interval [CI]: 6.1%-13.4%). Investigator-assessed ORR was 14.1% (1 CR; 95% CI: 10.2%-18.9%). Nearly half (46.5%) the patients had stable disease (SD) after treatment with eribulin mesylate. The clinical benefit rate (CBR, defined as CR+PR+SD greater than or equal to 6 months) was 17.1% (95% CI: 12.8%-22.1%).

The median duration of response was 4.2 months (126 days, range: 42*-258 days; 95% CI: 86-147). Median progression-free survival (PFS) was 2.6 months (79 days, range: 1*-397 days), and the median overall survival (OS) rate was 10.3 months (315 days, range: 19-604 days; 95% CI: 279-350). The six-month PFS and OS rates were 16.0% (95% CI: 8.6-17.0) and 72.3%, respectively (95% CI: 66.9-77.6).

The safety analysis included all 291 patients who received treatment with eribulin mesylate. Patients with up to Grade 2 peripheral neuropathy were included in the study. The most frequently reported Grade 3 (severe) or Grade 4 (disabling or life-threatening) adverse events were neutropenia (a decrease in the number of granular white blood cells, 54%); febrile neutropenia, 5.5%, leukopenia (low white blood cell count, 14%), and weakness/fatigue (10%; no Grade 4 events). Grade 3 peripheral neuropathy (a functional disturbance or damage to nerves outside the brain and spinal cord) was reported in 5.5% of patients. No Grade 4 peripheral neuropathy events were reported. No correlation was seen between Grade 2 peripheral neuropathy and deterioration.

"In this study, eribulin mesylate appeared to have an acceptable tolerability profile, particularly with regard to the low incidence of peripheral n
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SOURCE Eisai Corporation of North America
Copyright©2008 PR Newswire.
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