We evaluated the in vitro cytotoxicity of STRO-001...AML cell lines (MV4;11 and NOMO-1), and ALL cell lines (REH1 and RS4;11) with varied CD74 expression. STRO-001 demonstrates target-specific cytotoxicity against CD74-expressing AML and ALL cell lines...STRO-001 exhibited high potency in CD74 expressing cells, with IC-50s of 41nM (MV4;11), 1.3nM (NOMO-1), 0.7nM (REH-1) and 3nM (RS4;11).