Immuneering Corporation announced that the first patient has been dosed in its Phase 1/2a trial of IMM-6-415 to treat advanced solid tumors with RAF or RAS mutations. IMM-6-415 is a Deep Cyclic Inhibitor (DCI) of the MAPK pathway designed with unique drug-like properties including a shorter half-life than IMM-1-104 for an accelerated cadence that will be evaluated as an oral, twice-daily treatment in humans. In animal studies, IMM-6-415 strongly inhibited the growth of tumors with RAF or RAS mutations, as both a monotherapy and in combinations.

During the 2023 AACR-NCI-EORTC conference, Immuneering presented data showing that IMM-6-415 in combination with encorafenib achieved greater tumor growth inhibition and improved durability when compared head-to-head with binimetinib plus encorafenib, in animal models of RAF mutant melanoma and colorectal cancer, consistent with the thesis that DCI can outperform chronic MAPK inhibition. The Phase 1 portion of the Phase 1/2a clinical trial is an open-label study designed to evaluate the safety, tolerability, pharmacokinetics and pharmacodynamics of IMM-6-415 in patients with advanced RAF/RAS mutant solid tumors. The trial will include solid tumor patients with any mutation in RAF, KRAS, NRAS, or HRAS who meet the enrollment criteria.

The Phase 1 portion of the trial will evaluate IMM-6-415 following a Bayesian mTPI-2 escalation design, which includes a dose escalation phase and dose evaluation phase to establish a candidate recommended phase 2 dose (RP2D), with the RP2D to be evaluated in specific tumor cohorts in the Phase 2a portion of the trial.