SpringWorks NDA for Desmoid Tumor Drug

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FDA has accepted for priority review a SpringWorks Therapeutics NDA for nirogacestat, an investigational gamma secretase inhibitor for treating adults with desmoid tumors. The agency has set an 8/27 user fee review action target date.

The NDA is based on previously announced data from the Phase 3 DeFi trial. The primary endpoint was progression-free survival, or death by any cause, according to the company. Secondary and exploratory endpoints included safety and tolerability measures, objective response rate, duration of response, changes in tumor volume (MRI assessment), and changes in patient-reported outcomes. The data showed a statistically significant improvement for nirogacestat over placebo, with a 71% reduction in the risk of disease progression, it says.

The rare soft tissue tumors typically do not metastasize, but are associated with a high rate of recurrence, the company says. “Sometimes referred to as aggressive fibromatosis, or desmoid fibromatosis, these soft tissue tumors can be serious, debilitating, and, in rare cases when vital structures are impacted, they can be life-threatening,” it says. Historically, desmoid tumors were treated with surgical resection, but this approach has become less favored due to a high recurrence rate after surgery.

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