On August 13, 2025 Verastem Oncology (Nasdaq: VSTM), a biopharmaceutical company committed to advancing new medicines for patients with RAS/MAPK-pathway-driven cancers, reported positive, updated safety and efficacy data and late-breaking presentation details of partner GenFleet Therapeutics’ Phase 1/2 study in China of GFH375, an oral KRAS G12D (ON/OFF) inhibitor, known as VS-7375 outside of China, in advanced non-small cell lung cancer patients with a KRAS G12D mutation (Press release, Verastem, AUG 13, 2025, View Source [SID1234655207]). The data will be presented in a mini oral presentation at the IASLC 2025 World Conference on Lung Cancer (WCLC) hosted by the International Association for the Study of Lung Cancer from September 6-9, in Barcelona, Spain.

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"These data at WCLC build on the encouraging data presented at ASCO (Free ASCO Whitepaper) earlier this year, where GenFleet initially reported an ORR of 42% in 12 patients with advanced non-small cell lung cancer harboring a KRAS G12D mutation," said Dan Paterson, president and chief executive officer of Verastem Oncology. "The significant increase in patients with advanced lung cancer demonstrating a response, 68.8% ORR at the recommended Phase 2 dose, and 57.7% ORR across all dose levels, is impressive and continues to support the development and potential of VS-7375 in advanced lung cancer and across other advanced KRAS G12D solid tumors."

The late-breaking abstract was issued today by the WCLC. GenFleet reported cumulative safety data across the entire study population and preliminary efficacy data specific to patients with advanced NSCLC from the Phase 1/2 study in China. As of the data cutoff of July 15, 2025, the median follow-up time was 4.5 (range: 1.8-12.2) months. Tumor response was observed across the dose range tested. The study population includes 142 patients, including 28 with advanced NSCLC, 85 with advanced pancreatic ductal adenocarcinoma (PDAC) and 29 with other solid tumors. Amongst the patients with NSCLC, all had metastatic disease at baseline, 64.3% had received at least two prior lines of systemic therapies, and 96.4% had received an anti-PD1/PD-L1 therapy.

At the recommended Phase 2 dose of 600 mg once daily (QD), the ORR was 68.8% (11/16) (both confirmed and unconfirmed) and the disease control rate (DCR) was 93.8% (15/16). Among the 26 evaluable patients with NSCLC treated across all dose levels, the ORR was 57.7% (15/26) (both confirmed and unconfirmed) and the DCR was 88.5% (23/26).

Across all cancer types and dose levels evaluated, the most common treatment-related adverse events (TRAEs) occurring in at least 20% of patients were diarrhea, vomiting, nausea, anemia, decreased appetite, neutrophil count decreased, white blood cell count decreased, aspartate aminotransferase increased, asthenia, hypoalbuminemia, and alanine aminotransferase increased, predominately Grade 1 or 2 in severity. TRAEs and severe adverse events (SAEs), greater than Grade 3,occurred in 27.5% (39/142) and 7.7% (11/142) of patients, respectively. Of the 142 patients in the safety population, 11 patients had dose reduction, and six discontinued due to TRAEs. No TRAE-related deaths were reported.

WCLC Details

· Title: Efficacy and Safety of GFH375 in Advanced Non-Small Cell Lung Cancer Patients with KRAS G12D Mutation
· Session: MA02- New Treatment Strategies in Other Than EGFR-Positive Tumors
· Session Date/Time: Sunday, September 7, 2025 from 12:00 pm – 1:15 pm CEST

About KRAS G12D

KRAS G12D represents 26% of all KRAS mutations, making it the most prevalent KRAS mutation in human cancers. The KRAS G12D mutation occurs most commonly in pancreatic (37%), colorectal (12.5%), endometrial (8%), and non-small cell lung (5%) cancers. Currently, no therapies are approved by the U.S. Food and Drug Administration (FDA) specifically targeting KRAS G12D mutations in cancer.

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 initiated a Phase 1/2a clinical trial in June 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.