Background:Revumenib (SNDX-5613), a potent, selective small-molecule inhibitor of the menin-histone-lysine N-methyltransferase 2A (KMT2A) interaction, is being investigated in patients (pts) with relapsed/refractory (R/R) KMT2A-rearranged ( KMT2Ar)and nucleophosmin 1-mutated ( NPM1m) acute leukemias. An initial analysis of the phase 1 of AUGMENT-101 (NCT04065399) has been reported ( Nature.2023;615:920-924). Here we report an update of >1 year additional experience in the phase 1 portion of the study, which has completed enrollment, with safety data from 131 treated pts and efficacy data in 80 pts with R/R KMT2Arleukemia. Demographic data from pivotal phase 2 cohorts are included; safety and efficacy data of a preplannedanalysis will be reported at the meeting.