Verastem Oncology Receives FDA Orphan Drug Designation for Avutometinib and Defactinib for the Treatment of Pancreatic Cancer

On July 29, 2024 Verastem Oncology (Nasdaq: VSTM), a biopharmaceutical company committed to advancing new medicines for patients, reported that the U.S. Food and Drug Administration (FDA) has granted Orphan Drug Designation (ODD) to avutometinib, a RAF/MEK clamp, in combination with defactinib, a selective FAK inhibitor, for the treatment of pancreatic cancer (Press release, Verastem, JUL 29, 2024, View Source [SID1234645138]).

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"At the ASCO (Free ASCO Whitepaper) 2024 Annual Meeting, we reported positive initial interim results from the ongoing RAMP 205 trial evaluating avutometinib and defactinib in combination with standard of care chemotherapy in first-line metastatic pancreatic cancer," said Dan Paterson, president and chief executive officer of Verastem Oncology. "The FDA Orphan Drug Designation for the combination of avutometinib and defactinib for the treatment of pancreatic cancer recognizes the substantial unmet treatment need for patients with pancreatic cancer. We believe avutometinib and defactinib in combination with standard of care has an opportunity to provide a different approach in treating this challenging cancer. We look forward to reporting updated data from across dose cohorts in the ongoing RAMP 205 trial in the first quarter of 2025."

At the American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting in June 2024, Verastem presented initial interim safety and efficacy results from the ongoing RAMP 205 trial of avutometinib and defactinib in combination with current standard of care gemcitabine and nab-paclitaxel in first-line metastatic pancreatic cancer. As of the data cutoff of May 14, 2024, 41 patients had been treated in one of four dose cohort regimens and only patients in dose cohort 1 had a minimum follow up of six months. In the dose level 1 cohort, 83% (5/6) of patients achieved a confirmed partial response with more than six months of follow up at the time of data cutoff. One dose-limiting toxicity (DLT) was observed in the dose level 1 cohort, and the dose level was subsequently cleared after additional patients were enrolled. Of the 26 patients in all cohorts who have had the opportunity to have their first scan while on treatment, 21 have experienced a reduction of the change in target lesion sum of diameters. Read the press release here.

FDA Orphan Drug Designation is granted to certain investigational treatments for diseases or conditions that affect fewer than 200,000 people in the United States. Orphan Drug Designation provides benefits to drug developers, including tax credits for qualified clinical trials, exemptions from certain FDA user fees and the potential for seven years of market exclusivity upon approval.

About Metastatic Pancreatic Cancer

Pancreatic cancer is the third leading cancer in the U.S. and seventh leading cause of cancer-associated mortality worldwide. Metastatic pancreatic cancer is defined as stage IV cancer, where the cancer spreads to other organs. In the U.S., over 30,000 patients are diagnosed with metastatic pancreatic cancer each year, for which the five-year survival rate is 3%. Globally, over 240,000 patients are diagnosed with metastatic pancreatic cancer each year. More than 90% of pancreatic cancers have a KRAS mutation. The standard of care consists of surgery, chemotherapy, radiation or a combination of these approaches.

About RAMP 205 Phase 1/2 Study

RAMP 205 is a multicenter, open-label, single arm Phase 1b/2a study designed to evaluate the safety, tolerability and efficacy of avutometinib and defactinib in combination with standard of care chemotherapy (gemcitabine and Nab-paclitaxel) in patients with previously untreated metastatic pancreatic ductal adenocarcinoma. Part A of the study will evaluate different dose and schedule combinations to determine the recommended Phase 2 dose for expansion into Part B. RAMP 205 is supported by a PanCAN Therapeutic Accelerator Award.

About the Avutometinib and Defactinib Combination

Avutometinib is a RAF/MEK clamp that induces inactive complexes of MEK with ARAF, BRAF and CRAF potentially creating a more complete and durable anti-tumor response through maximal RAS/MAPK pathway inhibition. In contrast to currently available MEK-only inhibitors, avutometinib blocks both MEK kinase activity and the ability of RAF to phosphorylate MEK. This unique mechanism allows avutometinib to block MEK signaling without the compensatory activation of MEK that appears to limit the efficacy of other MEK-only inhibitors. The U.S. Food and Drug Administration (FDA) granted Breakthrough Therapy Designation of the investigational combination of avutometinib and defactinib, a selective FAK inhibitor, for the treatment of all patients with recurrent low-grade serous ovarian cancer (LGSOC) regardless of KRAS status after one or more prior lines of therapy, including platinum-based chemotherapy. Avutometinib alone or in combination with defactinib was also granted Orphan Drug Designation by the FDA for the treatment of LGSOC.

Verastem Oncology is currently conducting clinical trials with avutometinib in RAS/MAPK driven tumors as part of its Raf And Mek Program or RAMP. RAMP 301 (NCT06072781) is an international Phase 3 confirmatory trial evaluating the combination of avutometinib and defactinib versus standard chemotherapy or hormonal therapy for the treatment of recurrent LGSOC. RAMP 201 (NCT04625270) is a Phase 2 registration-directed trial of avutometinib in combination with defactinib in patients with recurrent LGSOC and enrollment has been completed in each of the dose optimization and expansion phases and the low-dose evaluation. Verastem has initiated a rolling NDA submission for avutometinib and defactinib combination in adults with recurrent LGSOC and expects to complete its NDA submission in the second half of 2024 with a potential FDA decision in the first half of 2025.

Verastem Oncology has established clinical collaborations with Amgen and Mirati to evaluate LUMAKRAS (sotorasib) in combination with avutometinib and defactinib and KRAZATI (adagrasib) in combination with avutometinib in KRAS G12C mutant NSCLC as part of the RAMP 203 (NCT05074810) and RAMP 204 (NCT05375994) trials, respectively. The RAMP 205 (NCT05669482), a Phase 1b/2 clinical trial evaluating avutometinib and defactinib with gemcitabine/nab-paclitaxel in patients with front-line metastatic pancreatic cancer, is supported by the PanCAN Therapeutic Accelerator Award.