Biomea Fusion, Inc. announced that the U.S. Food and Drug Administration (FDA) has cleared the company's investigational new drug application to begin a phase I trial of BMF-219, a selective irreversible menin inhibitor, in adult patients with relapsed or refractory acute leukemia including those with an MLL/KM2TA gene rearrangement or NPM1 mutation. An irreversible small molecule, such as BMF-219, is a synthetic compound that forms a permanent bond to its target protein and offers a number of potential advantages over conventional reversible drugs, including greater target selectivity, lower drug exposure, and the ability to drive a deeper, more durable response. The phase 1, first-in-human, open-label, dose-escalation and dose-expansion clinical trial of BMF-219 will assess the safety, pharmacokinetic (PK) and pharmacodynamic (PD) profile of BMF-219 in adult patients with relapsed or refractory acute leukemia including those with an MLL/KM2TA gene rearrangement or NPM1 mutation.