On June 2, 2025 Verastem Oncology (Nasdaq: VSTM), a biopharmaceutical company committed to advancing new medicines for patients with RAS/MAPK pathway-driven cancers, reported positive updated data from the dose escalation phase of the Phase 1/2 trial of GFH375 (known as VS-7375 in the U.S.). As of May 16, 2025, 23 efficacy-evaluable patients with pancreatic ductal adenocarcinoma (PDAC) and 12 efficacy-evaluable patients with non-small cell lung cancer (NSCLC) achieved an overall response rate (ORR) of 52% and 42%, respectively (Press release, Verastem, JUN 2, 2025, View Source [SID1234653635]). The updated data were presented by Verastem’s partner, GenFleet Therapeutics, in a rapid oral presentation at the 2025 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting on June 2, 2025, in Chicago, IL.
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"We are encouraged by the initial efficacy and safety results from the Phase 1 portion of the study of GFH375 in China by our partner, GenFleet Therapeutics. The results presented at ASCO (Free ASCO Whitepaper) further support our advancement of our clinical program for VS-7375 in the U.S., as we believe there remains a significant opportunity to further improve on the efficacy seen to date with other KRAS G12D-selective agents. VS-7375’s dual inhibition of both the ON/OFF states has the potential to drive deep and durable cancer responses and allow for better combinability with other agents," said Dan Paterson, president and chief executive officer of Verastem Oncology.
ASCO 2025 Presentation Highlights
GenFleet reported that 62 patients were enrolled in the Phase 1 portion of the study in China, receiving oral doses ranging from 100 to 900 mg daily. In the study, 98% of patients had metastatic disease, and 75% had received ≥2 prior lines of therapy. As of the data cutoff of May 16, 2025, 23 efficacy-evaluable patients with PDAC and 12 efficacy-evaluable patients with NSCLC, who received daily dosages of 400 or 600 mg and had at least one post-treatment tumor assessment, achieved an ORR of 52% and a disease control rate (DCR) of 100%, and an ORR of 42% and a DCR of 83%, respectively.
As of the cutoff date of March 31, 2025, GenFleet reported that there were no dose-limiting toxicities (DLTs) observed across all dose levels (100-900 mg QD), and the treatment-related adverse events (TRAEs) were mostly Grade 1/2. The most common TRAEs occurring in at least 20% of patients were diarrhea, nausea, vomiting, and anemia. TRAEs ≥ Grade 3 consisted mainly of decreased neutrophil count (8%) and diarrhea (5%). No TRAE-related deaths were reported.
Webcast Information
Verastem will hold an investor webcast on Monday, June 2, at 11:00 am CDT, to review the RAMP 205 updated data and the VS-7375 program including updated data from the study in China. The event will feature members of Verastem’s management team and key opinion leaders. A live audio webcast of the call, along with accompanying slides, will be accessible here. A replay of the webcast will be archived on the website for approximately 90 days following the presentation.
U.S. Phase 1/2a Study of VS-7375
The Phase 1/2a study will be conducted in the U.S., with the potential to expand globally, and will evaluate the safety and efficacy of VS-7375 in patients with advanced KRAS G12D mutant solid tumors. The starting dose for the Phase 1 study of 400 mg is based on the dose identified in the initial data from the GenFleet study to accelerate the trial’s progress. Verastem plans to dose escalate across levels where responses were observed in GenFleet’s study and will assess in the Phase 2a portion the efficacy and safety of VS-7375, both as monotherapy and in combination, in patients with advanced solid tumors, such as pancreatic, colorectal, and non-small cell lung cancers.
About VS-7375, an Oral KRAS G12D (ON/OFF) Inhibitor
VS-7375 is a potential best-in-class, potent, and selective oral KRAS G12D dual ON/OFF inhibitor. VS-7375 is the lead program from the Verastem Oncology discovery and development collaboration with GenFleet Therapeutics. Verastem announced in April 2025 that the U.S. Investigational New Drug (IND) application for VS-7375 was cleared and plans to initiate a Phase 1/2a clinical trial in mid-2025. GenFleet’s IND for VS-7375 (known as GFH375 in China) was approved in China in June 2024, and the first patient was dosed in a Phase 1/2 study in July 2024.