Daraxonrasib Shows SOC Potential in Metastatic PDAC

In the primary analysis population (patients with RAS G12 mutations), the median OS was 13.2 months (95% CI, 10.0-not estimable) with the oral RAS(ON) multiselective inhibitor daraxonrasib vs 6.6 months (95% CI, 5.4-8.2) with chemotherapy, representing a 60% reduction in the risk of death (HR, 0.40; 95% CI, 0.30-0.54; P = 5.9 × 10⁻¹⁰).¹ At 12 months, 53.3% of patients in the daraxonrasib arm remained alive compared with 18.7% in the chemotherapy arm.

The OS benefit was confirmed across the overall population, which included patients with and without an identified tumor RAS mutation (n = 248 daraxonrasib; n = 252 chemotherapy). Median OS was 13.2 months (95% CI, 10.0-not estimable) versus 6.7 months (95% CI, 5.8-8.0) with an identical HR of 0.40 (95% CI, 0.30-0.53; P = 4.6 × 10⁻¹¹). The 12-month OS rate in the overall population was 53.2% with daraxonrasib versus 17.3% with chemotherapy.

Daraxonrasib also significantly improved PFS by blinded independent central review (BICR). In the RAS G12 population, median PFS was 7.3 months (95% CI, 6.3-8.1) with daraxonrasib compared with 3.5 months (95% CI, 2.9-3.8) with chemotherapy (HR, 0.45; 95% CI, 0.34-0.59; P = 3.2 × 10⁻⁹). In the overall population, median PFS was 7.2 months (95% CI, 5.7-7.5) versus 3.6 months (95% CI, 2.9-4.2), respectively (HR, 0.49; 95% CI, 0.38-0.64; P = 5.2 × 10⁻⁸). The 6-month PFS rates were 58.7% versus 31.7% in the RAS G12 population and 56.0% versus 32.9% in the overall population.

The confirmed ORR by BICR was 33.2% with daraxonrasib versus 11.8% with chemotherapy in the RAS G12 population (P < .0001), and 31.6% versus 11.2% in the overall population (P < .0001), with both comparisons including complete and partial responses.

Based on the findings, the FDA previously authorized an expanded access treatment protocol for daraxonrasib in this patient population.³

“The results support daraxonrasib as the new standard of care for patients with previously treated metastatic PDAC,” said Brian Wolpin, MD, MPH, Hale Family Center for Pancreatic Cancer Research and Gastrointestinal Cancer Center, Dana-Farber Cancer Institute, Boston, Massachusetts.

Patient-Reported Outcomes

Daraxonrasib also demonstrated significant benefits in patient-reported outcomes. Using EORTC QLQ-PAN26 and EORTC QLQ-C30 questionnaires administered on day 1 of each cycle and at end of treatment, daraxonrasib significantly delayed time to deterioration in pain (median 9.2 vs 3.8 months; HR, 0.51; 95% CI, 0.37-0.71; P < .0001) and in global health status/quality of life (median 5.7 vs 2.6 months; HR, 0.60; 95% CI, 0.46-0.79; P = .0002) compared with chemotherapy in the overall population.

Safety

The safety profile of daraxonrasib was generally more favorable than that of chemotherapy, with notably lower rates of dose reduction, discontinuation, and serious treatment-related adverse events (TRAEs). Median time on treatment was 6.2 months (range, 0.03-14.1) with daraxonrasib versus 1.5 to 3.2 months (range, 0.03-12.9) across chemotherapy regimens. Median dose intensity was 93.1% with daraxonrasib and 65.3% to 95.0% across chemotherapy regimens.

Any TRAEs occurred in 97.9% of patients receiving daraxonrasib (n = 236 of 241) and 93.5% of patients receiving chemotherapy (n = 200 of 214). Grade ≥3 TRAEs were reported in 43.6% of daraxonrasib patients versus 57.5% of those receiving chemotherapy. Serious TRAEs were less frequent with daraxonrasib (10.8%) versus chemotherapy (18.7%). TRAEs leading to dose reduction occurred in 36.1% of daraxonrasib patients versus 57.5% of chemotherapy patients. TRAEs leading to treatment discontinuation were markedly lower with daraxonrasib at 1.2% versus 11.2% with chemotherapy.

The most common TRAEs leading to dose reduction with daraxonrasib were rash (17.4%) and stomatitis (6.6%), while those most commonly driving dose reduction with chemotherapy included neutropenia (16.8%), thrombocytopenia (13.6%), fatigue (12.6%), diarrhea (10.3%), and peripheral neuropathy (7.9%). One patient in the daraxonrasib arm died from treatment-related pneumonitis; no treatment-related deaths occurred in the chemotherapy arm.

Study Design and Patient Characteristics

RASolute 302 (NCT06625320) is a global, randomized, 1:1, open-label, phase 3 trial conducted across 59 sites in 6 countries.1 Eligible patients were adults with mPDAC who had received one prior fluoropyrimidine- or gemcitabine-based regimen in the metastatic setting, ECOG performance status of 0-1, and documented tumor RAS mutational status by local testing — including patients with RAS G12, G13, or Q61 mutations and those with no RAS mutation identified. Patients were randomized to daraxonrasib 300 mg orally once daily or investigator's choice of one of four chemotherapy regimens: gemcitabine plus nab-paclitaxel, modified FOLFIRINOX, nanoliposomal irinotecan plus 5-fluorouracil/leucovorin, or FOLFOX.

The dual primary endpoints were OS and PFS in the RAS G12 population. Key secondary endpoints included OS and PFS in the overall population, ORR in both populations, and time to deterioration in patient-reported outcomes. Randomization was stratified by ECOG performance status (0 vs 1), metastatic disease at diagnosis (yes vs no), liver metastases at baseline (yes vs no), and tumor RAS mutational status (RAS G12D/V vs other RAS G12 vs RAS G13 or Q61 mutation or no RAS mutation identified). The data cutoff for this primary and final analysis was February 10, 2026, with a median follow-up of 8.5 months (range, 3.2-15.9 months).

Daraxonrasib previously received FDA breakthrough therapy and orphan drug designations, and has been selected for the FDA Commissioner's National Priority Voucher pilot program, under which Revolution Medicines intends to submit a new drug application.³

Expert Perspective

“These results are landscape-changing for metastatic pancreatic cancer patients with a KRAS mutation. We are seeing unprecedented survival and efficacy in second-line treatment with an expected safety profile. The RAS revolution is here, and this study is proof of principle that targeting KRAS in pancreatic cancer is feasible and effective,” said Rachna Shroff, MD, MS, FASCO, Chief of the Division of Hematology/Oncology at the University of Arizona Cancer Center and an ASCO Expert in gastrointestinal cancers.²

References

1. Wolpin BM, Wainberg ZA, Hendifar AE, et al. Daraxonrasib, a RAS(ON) multi-selective inhibitor vs chemotherapy in previously treated metastatic pancreatic adenocarcinoma (mPDAC): primary and final analysis from the phase 3 RASolute 302 study. Presented at: 2026 American Society of Clinical Oncology Annual Meeting; May 29-June 2, 2026; Chicago, IL.

2. American Society of Clinical Oncology. Multi-selective RAS inhibitor nearly doubles survival in pancreatic cancer. ASCO Press Center. Published May 31, 2026. Accessed May 31, 2026. https://ac.asco.org/about-asco/press-center/multi-selective-ras-inhibitor-nearly-doubles-survival-pancreatic-cancer

3. FDA permits expanded access for investigational pancreatic cancer drug daraxonrasib [press release]. Silver Spring, MD: US Food and Drug Administration; May 1, 2026. Accessed May 30, 2026. https://www.fda.gov/news-events/press-announcements/fda-permits-expanded-access-investigational-pancreatic-cancer-drug