BOSTON – Verastem Oncology (Nasdaq:VSTM), a biopharmaceutical company committed to advancing new medicines for patients with cancer, today announced a mini oral presentation highlighting updated data from the ongoing investigator-sponsored Phase 1/2 FRAME study. The FRAME study, led by The Institute of Cancer Research, London, and The Royal Marsden NHS Foundation Trust, is investigating VS-6766, Verastem’s RAF/MEK inhibitor, in combination with defactinib, its FAK inhibitor, in patients with low grade serous ovarian cancer (LGSOC). The findings will be presented at the European Society of Medical Oncology (ESMO) Congress 2021, taking place September 16-21, 2021.
“Low-grade serous ovarian cancer is a rare, slow-growing cancer that does not respond well to chemotherapy or hormone therapy, and disproportionately affects younger women. The results presented at ESMO this year show that VS-6766 combined with defactinib continues to demonstrate encouraging response rates in patients with LGSOC, including a 46% partial response rate across the overall patient population and a 64% partial response rate in patients with KRAS-mutated LGSOC, with manageable rates of side-effects,” said Dr Susana Banerjee, MBBS, MA, PhD, FRCP, lead author of the presentation, Team Leader in Women’s Cancers at The Institute of Cancer Research, London, and Consultant Medical Oncologist and Research Lead for The Royal Marsden NHS Foundation Trust Gynaecology Unit.
“It’s particularly promising that the combination was also effective in patients who had previously received a MEK inhibitor. I am delighted that this drug combination has shown such encouraging results in a group of patients who urgently need new treatments.”
“The investigator-sponsored FRAME study, the initial results of which led the U.S. Food and Drug Administration (FDA) to grant Breakthrough Therapy designation for the VS-6766 and defactinib combination in LGSOC, continues to be instrumental in providing the foundational data for safety, efficacy and durability in this novel combination for RAS pathway tumors,” said Brian Stuglik, Chief Executive Officer of Verastem Oncology. “These data indicate that combining VS-6766 with defactinib results in promising response rates and median progression-free survival in patients who have already received MEK inhibitors. Verastem’s company-sponsored, registration-directed Phase 2 RAMP 201 study evaluating VS-6766 both alone and in combination with defactinib in patients with recurrent LGSOC is ongoing and we look forward to reporting top-line results from the selection portion of the study during the first half of 2022.”
Updated Phase 1/2 FRAME Study Results in Patients with LGSOC
Among the evaluable patients with LGSOC (n=24), the overall response rate (ORR) was 46% (11 of 24). Among the patients with KRAS mutant LGSOC (n=11), the ORR was 64% (7 of 11). Among the patients with KRAS wild type LGSOC (n=9), the ORR was 44% (4 of 9). Of the evaluable patients, 10 (42%) received previous MEK inhibitor therapy.
The mPFS across all patients was 23.0 months (95% CI: 10.6- not reached). As of the April 2021 data cutoff date, 13 of 24 patients (54%) remained on study.
For context, for other therapies studied in recurrent LGSOC, response rates have been between 6% and 26% and mPFS was between 7.2 and 13.0 months [1,2].
In the FRAME study, the most common Grade 3/4 treatment-related adverse events (AEs) were creatine kinase elevation (12%), rash (8%), diarrhea (4%), mouth ulcer/mucositis/glossitis (4%) and hyperbilirubinemia (4%), with only one discontinuation due to AEs as of the data cutoff.
These updated data suggest that the novel, intermittent dosing schedule used in the FRAME study continues to show encouraging clinical activity in patients with recurrent LGSOC, including in patients previously treated with a MEK inhibitor. Expansion cohorts are also ongoing in pancreatic cancer, KRAS/BRAF mutant endometrioid cancer and KRAS-G12V NSCLC.
About the Phase 1/2 FRAME Study
The FRAME study is an open-label, investigator-initiated study that is designed to assess safety, dose response and preliminary efficacy of the VS-6766/defactinib combination in patients with KRAS mutant solid tumors, including low-grade serous ovarian cancer (LGSOC), non-small cell lung cancer (NSCLC) and colorectal cancer (CRC). The FRAME study is being led by Professor Udai Banerji, MBBS, MD, DNB, PhD, FRCP, Deputy Director of the Drug Development Unit at The Institute of Cancer Research, London, and The Royal Marsden NHS Foundation Trust, and is being conducted in the United Kingdom. In this study, VS-6766 was administered using a twice-weekly dose escalation schedule and is administered 3 out of every 4 weeks. Defactinib is administered using a twice-daily dose escalation schedule, also 3 out of every 4 weeks. Dose levels are assessed in 3 cohorts: cohort 1 (VS-6766 3.2mg, defactinib 200mg); cohort 2a (VS-6766 4mg, defactinib 200mg); and cohort 2b (VS-6766 3.2mg, defactinib 400mg). The recommended Phase 2 dose was determined to be cohort 1 (VS-6766 3.2mg, defactinib 200mg).
About RAMP 201
Verastem Oncology has initiated a Phase 2 registration-directed trial evaluating VS-6766 alone and in combination with defactinib in patients with recurrent LGSOC as part of RAMP (Raf And Mek Program). RAMP 201 (ENGOTov60/GOG3052) is an adaptive, two-part multicenter, parallel cohort, randomized, open-label trial to evaluate the efficacy and safety of VS-6766 alone and in combination with defactinib in patients with recurrent LGSOC [3]. The first part of the study will determine the optimal regimen of either VS-6766 monotherapy or in combination with defactinib in patients with recurrent LGSOC randomized 1:1 in each treatment arm. The determination of which regimen to take forward into the expansion phase of the trial will be made based on objective response rate data. The expansion phase of the study will examine efficacy and safety parameters of the regimen selected.
For more information, please visit www.RAMP201Study.com.
About the VS-6766/Defactinib Combination
The combination of VS-6766 and defactinib has been found to be clinically active in patients with KRAS mutant tumors. In an ongoing investigator-initiated Phase 1/2 FRAME study, the combination of VS-6766 and defactinib is being evaluated in patients with LGSOC, KRAS mutant NSCLC and colorectal cancer (CRC). The FRAME study was expanded to include new cohorts in pancreatic cancer, KRAS mutant endometrioid cancer and KRAS-G12V NSCLC. Verastem Oncology is also supporting an investigator-initiated Phase 2 trial evaluating VS-6766 with defactinib in patients with metastatic uveal melanoma. Verastem Oncology has initiated Phase 2 registration-directed trials of VS-6766 with defactinib in patients with recurrent LGSOC and in patients with recurrent KRAS-G12V mutant NSCLC as part of its RAMP (Raf And Mek Program).
The U.S. Food and Drug Administration (FDA) granted Breakthrough Therapy designation for the combination of Verastem Oncology’s investigational RAF/MEK inhibitor VS-6766, with defactinib, its 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.
About Verastem Oncology
Verastem Oncology (Nasdaq: VSTM) (Verastem, Inc.) is a development-stage biopharmaceutical company committed to the development and commercialization of new medicines to improve the lives of patients diagnosed with cancer. Our pipeline is focused on novel small molecule drugs that inhibit critical signaling pathways in cancer that promote cancer cell survival and tumor growth, including RAF/MEK inhibition and focal adhesion kinase (FAK) inhibition. For more information, please visit www.verastem.com.
References:
[1] Gershenson, et al. European Society for Medical Oncology 2019.
[2] Monk, et al. Journal of Clinical Oncology 2020
[3] Clinicaltrials.gov. A Study of VS-6766 v. VS-6766 + Defactinib in Recurrent Low-Grade Serous Ovarian Cancer With and Without a KRAS Mutation. Available at: https://clinicaltrials.gov/ct2/show/NCT04625270?cond=vs6766&draw=2&rank=1.
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