VSTM Up as NDA for Ovarian Cancer Combo Gets FDA's Priority Review Tag

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Shares of Verastem Oncology VSTM rallied 40.9% on Tuesday after it announced that the FDA has accepted the new drug application (NDA) for its avutometinib/defactinib combo therapy to treat adult patients with recurrent low-grade serous ovarian cancer (LGSOC) for review under the accelerated approval pathway. The intended treatment population includes LGSOC patients who have received at least one prior systemic therapy and have a KRAS mutation.

Both avutometinib and defactinib have been in-licensed by Verastem from other pharmaceutical companies. Avutometinib is an RAF/MEK clamp, while defactinib is a best-in-class selective FAK inhibitor.

The FDA has granted the Priority Review status to the avutometinib/defactinib NDA filing for LGSOC. A filing accepted under the regulatory body’s Priority Review pathway reduces the review period to six months from the standard 10 months. This status is given to treatments that the FDA believes, could significantly improve existing options or provide solutions where no approved therapy exists. A final decision is expected on June 30, 2025. Per Verastem, the FDA has also stated that it does not plan to hold an advisory committee meeting to discuss the application.

In the past three months, shares of Verastem have surged 86.6% against the industry’s 9.5% decline.

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More on the FDA Acceptance of Avutometinib NDA for LGSOC

Verastem’s NDA filing is based on the primary analysis of the phase II RAMP 201 study that evaluated the combination of avutometinib and defactinib in patients with recurrent LGSOC. Per the data readout, treatment with the combo regimen resulted in a substantial overall response rate, confirmed by a blinded independent central review. Treatment responses were also typically durable. Additionally, the combo regimen was generally well-tolerated in patients with recurrent KRAS mutant LGSOC. The avutometinib NDA is also supported by data from the phase I FRAME study, the first study conducted with the avutometinib/defactinib combo therapy in recurrent LGSOC.

At present, there are no FDA-approved treatments specifically for LGSOC, a rare and distinct type of ovarian cancer with unique biology and treatment responses compared to high-grade serous ovarian cancer, representing a huge unmet medical need. Per Verastem, an estimated 6,000-8,000 women in the United States and 80,000 worldwide suffer from this disease. The standard of care treatment includes hormone therapy and chemotherapy.

Subject to approval, the avutometinib/defactinib regimen will become the first-ever FDA-approved treatment specifically for adults with recurrent KRAS mutant LGSOC. Verastem is preparing for a potential commercial launch of the combo therapy in the United States in mid-2025.