Emavusertib Phosphate (also known as CA-4948) is a potent inhibitor of IRAK4 and FLT3, exhibiting antitumor activity. In ABC DLBCL and AML cell lines, it demonstrates significant cellular efficacy. Furthermore, CA-4948 shows moderate to high selectivity across a panel of 329 kinases and possesses favorable ADME and PK profiles, including good oral bioavailability in mice, rats, and dogs. It achieves over 90% tumor growth inhibition in relevant tumor models and correlates excellently with in vivo PD modulation.