Preliminary preclinical data have been reported for Enliven Therapeutics Inc.’s ATP-competitive small-molecule ABL1 tyrosine kinase inhibitor (TKI) ELVN-001. In vitro antiproliferative effects, assessed using the biomarker Tyr207-phosphorylated CRKL, demonstrated that ELVN-001 had potent activity with IC50 values ranging from 19 to 112 nM against BCR-ABL1-driven chronic myeloid leukemia (CML) cell lines in the presence of 50% to 100% human serum.