Additional Relevant Details Halaven is the first and only single agent systemic therapy to demonstrate an improvement in overall survival (OS) in people previously treated for soft tissue sarcomas in a randomized controlled trial. In Study 309, which examined the efficacy and safety of Halaven versus dacarbazine in patients with locally advanced, recurrent or metastatic soft tissue sarcoma (liposarcoma or leiomyosarcoma) who had disease progression following standard therapies (including an anthracycline and at least one other additional regimen), Halaven demonstrated a statistically significant extension in the study's primary endpoint of OS over the comparator treatment dacarbazine (Halaven median OS: 13.5 months vs dacarbazine median OS: 11.5 months; Hazard Ratio (HR) 0.77 [95% CI=0.62-0.95], p=0.0169).
In this study, the most common treatment-emergent adverse events (incidence greater than or equal to 25%) in patients treated with Halaven were fatigue, neutropenia, nausea, alopecia, constipation, peripheral neuropathy, abdominal pain, and pyrexia, which was consistent with the known side-effect profile of Halaven.

Halaven is a halichondrin class microtubule dynamics inhibitor with a novel mechanism of action. Recent non-clinical studies showed that Halaven is associated with increased vascular perfusion and permeability in tumor cores.2 Halaven promotes the epithelial state and decreases the capacity of breast cancer cells to migrate.3 It was first approved for the treatment of metastatic breast cancer in the United States in November 2010, and is currently approved for use in the treatment of breast cancer in approximately 60 countries including Japan and countries in Europe, the Americas and Asia.