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ResearchIn-Press PreviewHematologyTherapeutics Open Access | 10.1172/JCI162593
1Seattle Children’s Therapeutics, Seattle Children’s Research Institute, Seattle, United States of America
22seventy bio, Cambridge, United States of America
3Seattle Children’s Therapeutics, Seattle Children's Research Institute, Seattle, United States of America
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6Vanadro Consulting, Urbandale, United States of America
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22seventy bio, Cambridge, United States of America
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22seventy bio, Cambridge, United States of America
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22seventy bio, Cambridge, United States of America
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Published March 19, 2024 - More info
Chimeric antigen receptor (CAR) designs that incorporate pharmacologic control are desirable, however designs suitable for clinical translation are needed. We designed a fully human, rapamycin-regulated, drug product for targeting CD33+ tumors called dimerization agent regulated immunoreceptor complex (DARIC33). T cell products demonstrated target specific and rapamycin-dependent cytokine release, transcriptional responses, cytotoxicity, and in vivo antileukemic activity in the presence of as little as 1nM rapamycin. Rapamycin withdrawal paused DARIC33-stimulated T cell effector functions, which were restored following re-exposure to rapamycin, demonstrating reversible effector function control. While rapamycin-regulated DARIC33 T cells were highly sensitive to target antigen, CD34+ stem cell colony forming capacity was not impacted. We benchmarked DARIC33 potency relative to CD19 CAR T cells to estimate a T cell dose for clinical testing. In addition, we integrated in vitro and preclinical in vivo drug concentration thresholds for OFF-ON state transitions, as well as murine and human rapamycin pharmacokinetics, to estimate a clinically applicable rapamycin dosing schedule. A phase 1 DARIC33 trial has been initiated (PLAT-08, NCT05105152), with initial evidence of rapamycin-regulated T cell activation and anti-tumor impact. Our findings provide evidence that the DARIC platform exhibits sensitive regulation and potency needed for clinical application to other important immunotherapy targets.