RAS(ON) multi-selective inhibition offering the first targeted approach for patients with NRAS-mutant melanoma
Targeted therapies for NRAS-mutant melanoma remain an unmet clinical need. Here, we demonstrate that RMC-7977, a preclinical RAS(ON) multi-selective inhibitor representative of the investigational agent daraxonrasib (RMC-6236), was able to elicit potent antitumor immune responses across multiple NRAS-mutant melanoma models. Treatment with RMC-7977 led to rapid tumor regressions driven by inhibition of MAPK signaling, upregulation of major histocompatibility complex (MHC) and PD-L1 proteins, and enhanced infiltration of CD4⁺ and CD8⁺ T cells. Complete responses were dependent on adaptive immunity, as both CD4⁺ and CD8⁺ T cells were essential for extended survival. Resistance to treatment was marked by reduced T-cell infiltration, loss of MHC class I expression, and expansion of myeloid-derived suppressor cells. Combining RMC-7977 with anti-PD-1 boosted cytotoxic T-cell infiltration, reprogrammed myeloid cells toward an antigen-presenting phenotype, and improved survival in models resistant to PD-1 blockade. Consistent with these preclinical data, objective clinical responses were observed in two NRAS-mutant melanoma patients treated with daraxonrasib in an ongoing Phase I/Ib clinical trial. Together, these data support the continued clinical evaluation of RAS(ON) multi-selective inhibitors for the treatment of NRAS-mutant melanoma.
Source:
Anastacio Da Costa Carvalho L, Tovbis Shifrin N, Phadke MS, Emmons MF, Pechuan-Jorge X, Mbuga F, Ospina OE, Chow C, Seu L, Rose OL, Hegde A, Khushalani NI, Quintana E, Smalley KSM. RAS(ON) multi-selective inhibition drives antitumor immunity in preclinical models of NRAS-mutant melanoma. Cancer Immunol Res. 2025 Nov 4:10.1158/2326-6066.CIR-25-0744. doi: 10.1158/2326-6066.CIR-25-0744. Epub ahead of print. PMID: 41186497; PMCID: PMC12666865.