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Verastem seeks US FDA approval for Duvelisib to treat relapsed/refractory CLL/SLL and FL

Friday, February 9, 2018, 17:00 Hrs  [IST]

Verastem, focused on discovering and developing drugs to improve the survival and quality of life of cancer patients, announced it has submitted a New Drug Application (NDA) to the US Food and Drug Administration (FDA) seeking full approval for its lead product candidate duvelisib, a first-in-class oral dual inhibitor of phosphoinositide-3-kinase (PI3K)-delta and PI3K-gamma, for the treatment of relapsed or refractory chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) and accelerated approval for the treatment of relapsed or refractory follicular lymphoma (FL).

Duvelisib has received Fast Track Designation from the FDA for patients with CLL or peripheral T-cell lymphoma (PTCL) who have received at least one prior therapy and for patients with FL who have received at least two prior therapies. In addition, duvelisib received orphan drug designation in the United States and the European Union for patients with CLL, SLL and FL.

“The submission of our first NDA for duvelisib is a major milestone for Verastem and is the culmination of substantial effort by our employees and the investigators who have dedicated themselves toward developing a potential treatment option for patients who are in need of additional therapies. We are immensely grateful to all of the patients that participated in the duvelisib clinical trial program over the last few years,” said Robert Forrester, president and chief executive officer of Verastem. “Oral duvelisib is the first PI3K inhibitor to show efficacy as a monotherapy in a randomized Phase 3 study in patients with relapsed or refractory CLL/SLL. Duvelisib monotherapy has also demonstrated significant clinical activity in patients with double-refractory FL. We believe duvelisib will offer a convenient oral treatment alternative. We look forward to working with the FDA during the review process and to a potential US approval decision for duvelisib in early 2019.”

The NDA is supported by clinical data from the randomized phase 3 DUO study demonstrating significant efficacy, along with a consistent and manageable safety profile, of duvelisib monotherapy in patients with relapsed or refractory CLL/SLL. The DUO study met its primary endpoint with oral duvelisib monotherapy achieving a statistically significant improvement in progression-free survival (PFS) compared to ofatumumab in patients with relapsed or refractory CLL/ SLL (median PFS of 13.3 months versus 9.9 months, respectively; HR=0.52; p<0.0001), representing a 48% reduction in the risk of disease progression or death. The NDA is also supported by results from the phase 2 DYNAMO study in patients with indolent non-Hodgkin’s lymphoma that are double-refractory to both rituximab and chemotherapy or radioimmunotherapy, which also achieved its primary endpoint with an objective response rate (ORR) of 46% (p<0.0001). In the subset of patients enrolled in DYNAMO with double-refractory FL (n=83), duvelisib demonstrated an ORR of 41%.


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