FLT3 receptor nature July 25 (plus safety switch comment)4 Oct 2025 23:17
FLT3
FLT3 is a very well-characterized receptor ligand for HSCs maintenance and differentiation. It is implicated in 30% of patients with AML (approximately 24% involving FLT3-ITD and 7-10% involving FLT3-TKD280). Some FLT3 inhibitors have already received FDA approval (midostaurin, gilteritinib) with an acceptable safety profile.281 Additional FLT3 inhibitors under investigation include quizartinib,282 sorafenib283 and crenolanib.284 To date, most data regarding CAR-T cell therapy is preclinical,285,286,287 and significant concerns have been raised regarding FLT3 expression in HSCs. In this context, some constructs in development include safety switches (described in the following sections) to reduce myeloablation.288
Other potential targets currently under investigation include CD19,289 ADGRE2,193,290 and ILT3.291 However, there is limited data available regarding their efficacy and safety.