On May 11, 2026 Erasca, Inc. (Nasdaq: ERAS), a clinical-stage precision oncology company singularly focused on discovering, developing, and commercializing therapies for patients with RAS/MAPK pathway-driven cancers, reported a clinical trial collaboration and supply agreement (CTCSA) with Merck, known as MSD outside of the United States and Canada.
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This agreement supports a clinical proof-of-concept study, AURORAS-1, evaluating the pan-RAS molecular glue ERAS-0015 in combination with KEYTRUDA (pembrolizumab), Merck’s anti-PD-1 therapy, for the treatment of patients with RAS-mutant (RASm) solid tumors. Erasca is sponsoring the study, and Merck is supplying pembrolizumab at no cost.
"We are excited to work with Merck to advance this promising investigational combination in RAS-driven cancers," said Jonathan E. Lim, M.D., Erasca’s chairman, CEO, and co-founder. "RAS mutations activate the RAS/MAPK pathway and promote an immunosuppressive environment. Non-clinical data suggest that targeting the pathway with ERAS-0015 may complement PD-1 blockade by reducing immunosuppression and driving more robust and durable tumor responses."
Worldwide, approximately 2.7 million patients are diagnosed annually with RASm tumors. Lack of effective treatments targeting multiple mutations and emergence of resistance mechanisms continue to challenge the ability to achieve and maintain responses across RAS-driven tumors. Erasca is exploring whether pan-RAS inhibition with ERAS-0015 in combination with pembrolizumab can further improve therapeutic benefits and limit the development of treatment resistance.
About ERAS-0015
ERAS-0015 is an investigational, oral, highly potent pan-RAS molecular glue designed to inhibit RAS signaling with a potential best-in-class profile. Erasca is evaluating ERAS-0015 in the AURORAS-1 Phase 1 trial in patients with RAS-mutant solid tumors. Early dose escalation data in AURORAS-1 demonstrated favorable safety and tolerability results, well-behaved, linear PK, and confirmed and unconfirmed partial responses in multiple patients across multiple tumor types with different RAS mutations, including confirmed and unconfirmed partial responses at doses as low as 8 mg once daily (QD). ERAS-0015 is also designed to prevent resistance against mutant-selective inhibitors through inhibition of RAS wildtype variants. In addition, ERAS-0015 has demonstrated favorable absorption, distribution, metabolism, and excretion (ADME) and pharmacokinetic (PK) properties in multiple animal species.
(Press release, Erasca, MAY 11, 2026, View Source [SID1234665477])