On January 19, 2023 Mirati Therapeutics, Inc. (NASDAQ: MRTX), reported the U.S. Food and Drug Administration (FDA) has cleared the Investigational New Drug (IND) application of MRTX1133, a potential first-in-class oral KRASG12D selective inhibitor for clinical evaluation (Press release, Mirati, JAN 19, 2023, View Source [SID1234626400]). KRASG12D mutations impact approximately 180,000 patients in the US and Europe, representing approximately a 2.5-fold increase in prevalence compared to KRASG12C mutations. No targeted oncology treatment options currently exist for these patients.

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MRTX1133 is a highly potent investigational inhibitor of the KRASG12D driver mutation and demonstrated selective and reversible inhibition of KRASG12D in both its active and inactive states. In addition, MRTX1133 administration resulted in marked tumor response in preclinical KRASG12D mutated pancreatic cancer models as well as lung and colorectal cancer models. MRTX1133 has demonstrated favorable properties including a low risk for off-target activity and drug interactions and a predicted human half-life of greater than 50 hours.

"The clearance by the FDA to initiate clinical evaluation of MRTX1133, the third program in our KRAS franchise to enter clinical development, is illustrative of the innovative approach to drug discovery and demonstrates the best-in-class capabilities of the Mirati team. This particular mutation has been difficult to target, and we are confident in our novel oral formulation strategy, which we believe will enable near-complete target inhibition over the full dosing interval," said James Christensen, Ph.D. chief scientific officer, Mirati Therapeutics, Inc. "We are thrilled to advance MRTX1133 into clinical development and the potential to positively impact people living with KRASG12D-mutated cancers."

The Phase 1/2 clinical trial will launch in early 2023 with plans for multiple expansion cohorts in pancreatic, colorectal, lung and other KRASG12D tumor types.