On July 11, 2025 Verastem Oncology (Nasdaq: VSTM), a biopharmaceutical company committed to advancing new medicines for patients with RAS/MAPK pathway-driven cancers, reported that the primary analysis of the Phase 2 RAMP 201 clinical trial was published online in the Journal of Clinical Oncology (JCO) (Press release, Verastem, JUL 11, 2025, View Source [SID1234654350]). The data reported in the publication showed that avutometinib plus defactinib demonstrated a confirmed overall response rate (ORR) of 31% in all patients with recurrent low-grade serous ovarian cancer (LGSOC). The full manuscript, titled "Efficacy and Safety of Avutometinib ± Defactinib in Recurrent Low-Grade Serous Ovarian Cancer: Primary Analysis of ENGOT-OV60/GOG-3052/RAMP 201," will also appear in the print publication of JCO.
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"The publication of the primary analysis of the RAMP 201 study in recurrent low-grade serous ovarian cancer in the Journal of Clinical Oncology reflects the meaningful clinical advancement demonstrated by the combination of avutometinib plus defactinib for patients with recurrent low-grade serous ovarian cancer," said John Hayslip, M.D., chief medical officer at Verastem Oncology. "The findings supported the recent FDA approval of the combination in KRAS-mutated recurrent low-grade serous ovarian cancer and our ongoing global Phase 3 RAMP 301 trial of the combination in recurrent low-grade serous ovarian cancer with and without a KRAS mutation."
The Company will submit the RAMP 201 publication and the recent publication of the FRAME study to the National Comprehensive Cancer Network (NCCN) in support of its consideration of inclusion of the KRAS wild-type population evaluated in these trials in the NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines). Currently, the combination is listed as an NCCN Category 2A recommendation for the treatment of KRAS-mutated recurrent LGSOC, which is aligned with the FDA-approved indication.
JCO Publication of RAMP 201
The Phase 2 RAMP 201 trial evaluated the safety, tolerability, and efficacy of avutometinib with and without defactinib in patients with recurrent LGSOC who had received a median of three (range one to nine) prior lines of therapy, including chemotherapy, hormonal therapy, bevacizumab, and MEK inhibitors. The publication included the primary analysis of the Phase 2 RAMP 201 trial that showed a confirmed ORR of 31% (34/109) in all 109 evaluable patients, 44% (25/57) in patients with a KRAS mutation, and 17% (9/52) in patients with KRAS wild-type. The median duration of response (DOR) was 31.1 months for all patients, 31.1 months in the KRAS mutant population, and 9.2 months in the KRAS wild-type population. Median progression-free survival (PFS) was 12.9 months for all patients, 22.0 months in the KRAS mutant population, and 12.8 months in the KRAS wild-type population. The majority of patients (82%) had some reduction in target lesions, regardless of KRAS mutation status. The disease control rate (DCR) at 6 or more months was 61% in the total population, 70% in the KRAS-mutated population, and 50% in the KRAS wild-type population.
"Our paper showed that the combination of avutometinib plus defactinib demonstrated clinically meaningful and durable responses in patients with recurrent low-grade serous ovarian cancer. The recent FDA accelerated approval of the combination in KRAS-mutated recurrent low-grade serous ovarian cancer, which is based on these results, is fantastic news. The fact that a majority of patients had some reduction in target lesions, regardless of KRAS mutation status, underscores the advancement the combination represents in this rare ovarian cancer and its potential to be the new standard of care in recurrent low-grade serous ovarian cancer," said Professor Susana Banerjee, M.B.B.S., M.A., Ph.D., F.R.C.P, Consultant Medical Oncologist at The Royal Marsden NHS Foundation Trust and Team Leader in Women’s Cancers at The Institute of Cancer Research, London and Global Lead Principal Investigator of ENGOTov60/GOG3052/NCRI/RAMP201.
The results also demonstrated that the combination is well-tolerated, with a 10% discontinuation rate due to adverse events (AEs). The most common AEs (all grades, grade ≥3) were nausea (67.0%, 2.6%), diarrhea (58.3%, 7.8%), and increased creatine phosphokinase levels (60.0%, 24.3%).
"The publication of the Phase 2 RAMP 201 trial supports our understanding of the role that the combination of avutometinib plus defactinib plays in treating patients with recurrent low-grade serous ovarian cancer. We are excited to continue to build on the findings from the trial and advance the research in this disease with the ongoing international Phase 3 RAMP 301 trial, which is evaluating the combination in patients with and without a KRAS mutation," said Rachel Grisham, M.D., Section Head, Ovarian Cancer at Memorial Sloan Kettering Cancer Center in New York, NY and Global Lead Principal Investigator of GOG-3097/ENGOT-ov81/GTG-UK/RAMP 301.
The RAMP 201 study results were initially presented in an oral plenary session at the International Gynecologic Cancer Society (IGCS) Annual Meeting in October 2024.
About RAMP 201
RAMP 201 (ENGOTov60/GOG3052/NCRI) (NCT04625270) was an adaptive, two-part multicenter, parallel cohort, randomized, open-label Phase 2 registration-directed trial evaluating the efficacy and safety of avutometinib alone and in combination with defactinib in patients with recurrent low-grade serous ovarian cancer (LGSOC). The first part of the trial (Part A) determined the selection of the go-forward regimen, which was the combination of avutometinib and defactinib versus avutometinib alone, based on overall response rates. The expansion phases of the trial (Parts B and C) evaluated the safety and efficacy of the go-forward regimen of avutometinib 3.2 mg twice weekly and defactinib 200 mg twice daily. The Part D portion of the trial evaluated a low dose of the combination to inform individualized dose reduction.
About Low-Grade Serous Ovarian Cancer (LGSOC)
LGSOC is a rare ovarian cancer that is insidious and persistent. LGSOC is distinct and different from high-grade serous ovarian cancer (HGSOC) and requires different treatment. LGSOC is highly recurrent and less sensitive to chemotherapy compared to HGSOC. Approximately 6,000-8,000 women in the U.S. and 80,000 worldwide are living with this disease. LGSOC affects younger women with bimodal peaks of diagnosis at ages between 20-30 and 50-60 and has a median survival of approximately ten years. Approximately 70 percent of LGSOC shows RAS pathway-associated mutations, and 30 percent of people with LGSOC have a KRAS mutation. The majority of patients report a negative impact of LGSOC on their mental and physical health, fertility, and long-term quality of life.
About AVMAPKI and FAKZYNJA Combination Therapy
AVMAPKI (avutometinib) inhibits MEK kinase activity while also blocking the compensatory reactivation of MEK by upstream RAF. RAF and MEK proteins are regulators of the RAS/RAF/MEK/ERK (MAPK) pathway. Blocking RAF and/or MEK activates FAK, a key mediator of drug resistance. FAKZYNJA (defactinib) is a FAK inhibitor and together, the avutometinib and defactinib combination was designed to provide a more complete blockade of the signaling that drives the growth and drug resistance of RAS/MAPK pathway-dependent tumors.
The U.S. Food and Drug Administration (FDA) approved AVMAPKI FAKZYNJA CO-PACK (avutometinib capsules; defactinib tablets) for the treatment of adult patients with KRAS-mutated recurrent LGSOC who have received prior systemic therapy on May 8, 2025. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial. Verastem is conducting RAMP 301 (GOG-3097/ENGOT-ov81/GTG-UK) (NCT06072781), an international Phase 3 confirmatory trial evaluating the combination of avutometinib and defactinib versus standard chemotherapy or hormonal therapy for the treatment of recurrent low-grade serous ovarian cancer (LGSOC) with and without a KRAS mutation. Verastem is also evaluating avutometinib in combination with defactinib and other agents as a potential treatment for patients with advanced pancreatic cancer (RAMP 205; NCT05669482) and advanced KRAS G12C mutant non-small cell lung cancer (RAMP 203; NCT05074810). Avutometinib and defactinib are not approved by the FDA or any other regulatory authority, either in combination or with other therapies, for any of these investigative uses. Neither avutometinib nor defactinib are approved by the FDA or any other regulatory authority on a stand-alone basis for any use.
AVMAPKI FAKZYNJA CO-PACK U.S. Indication
Indication
AVMAPKI FAKZYNJA CO-PACK is indicated for the treatment of adult patients with KRAS-mutated recurrent low-grade serous ovarian cancer (LGSOC) who have received prior systemic therapy.
This indication is approved under accelerated approval based on tumor response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial.
Important Safety Information
Warnings and Precautions
Ocular Toxicities: Ocular toxicities, including visual impairment and vitreoretinal disorders, occurred. Perform comprehensive ophthalmic evaluation at baseline, prior to cycle 2, every three cycles thereafter, and as clinically indicated. Withhold AVMAPKI FAKZYNJA CO-PACK for ocular toxicities until improvement at the same or reduced dose. Permanently discontinue AVMAPKI FAKZYNJA CO-PACK for any grade 4 toxicity.
Serious Skin Toxicities: Skin toxicities, including photosensitivity and severe cutaneous adverse reactions (SCARSs) occurred. Adhere to concomitant medications. Monitor for skin toxicities and interrupt, reduce or permanently discontinue AVMAPKI FAKZYNJA CO-PACK based on severity, tolerability and duration.
Hepatotoxicity: Monitor liver function tests prior to each cycle, on day 15 of the first 4 cycles, and as clinically indicated. Withhold, reduce or discontinue AVMAPKI FAKZYNJA CO-PACK based on severity and persistence of abnormality.
Rhabdomyolysis: Monitor creatine phosphokinase prior to the start of each cycle, on day 15 of the first four cycles, and as clinically indicated. If increased CPK occurs, evaluate patients for rhabdomyolysis or other causes. Withhold, reduce or permanently discontinue AVMAPKI FAKZYNJA CO-PACK based on severity and duration of the adverse reaction.
Embryo-Fetal Toxicity: AVMAPKI FAKZYNJA CO-PACK can cause fetal harm. Advise patients of the potential risk to a fetus and to use effective contraception.
Adverse Reactions
The most common (≥ 25%) adverse reactions, including laboratory abnormalities, were increased creatine phosphokinase, nausea, fatigue, increased aspartate aminotransferase, rash, diarrhea, musculoskeletal pain, edema, decreased hemoglobin, increased alanine aminotransferase, vomiting, increased blood bilirubin, increased triglycerides, decreased lymphocyte count, abdominal pain, dyspepsia, dermatitis acneiform, vitreoretinal disorders, increased alkaline phosphatase, stomatitis, pruritus, visual impairment, decreased platelet count, constipation, dry skin, dyspnea, cough, urinary tract infection, and decreased neutrophil count.
Drug Interactions
Strong and moderate CYP3A4 inhibitors: Avoid concomitant use with AVMAPKI FAKZYNJA CO-PACK.
Strong and moderate CYP3A4 inducers: Avoid concomitant use with AVMAPKI FAKZYNJA CO-PACK.
Warfarin: Avoid concomitant use of AVMAPKI FAKZYNJA CO-PACK with warfarin and use an alternative to warfarin.
Gastric acid reducing agents: Avoid concomitant use of AVMAPKI FAKZYNJA CO-PACK with proton pump inhibitors (PPIs) or H2 receptor antagonists. If use of an acid-reducing agent cannot be avoided, administer FAKZYNJA 2 hours before or 2 hours after the administration of a locally acting antacid.
Use in Specific Populations
Lactation: Advise not to breastfeed.
Fertility: May impair fertility in males and females.