A randomized, placebo‐controlled study to evaluate safety and pharmacokinetics of ART‐001 with a novel oral pediatric formulation in healthy subjects

ART‐001 is an orally available selective PI3Kα inhibitor currently being developed for the treatment of slow‐flow vascular malformations (SFVMs). ART‐001 used to be developed for advanced solid tumors, but was suspended largely due to significant pharmacokinetic (PK) variability in its phase I studies. This phase I, randomized, double‐blinded, placebo‐controlled study evaluated safety, tolerability and PK of ART‐001 with a newly developed dry syrup formulation, which was designed to optimize PK properties of ART‐001 and to be compliant with the pediatric population. Single and multiple doses of ART‐001 were administered to healthy male adults. ART‐001 was rapidly absorbed after the single and repeated doses, and the exposure of ART‐001 increased with increased dose. The dry syrup formulation substantially improved the intersubject PK variability. Food decreased area under the concentration‐time curve (AUC) and maximum plasma concentration by 12% and 36%, respectively. The plasma concentration had reached a steady‐state on day 5 of the repeated doses of 100 mg and AUC accumulation ratio was 1.9. There were no deaths or serious adverse events. The most frequent adverse event was hyperglycemia. All cases of hyperglycemia were mild to moderate and transient, and required no medical interventions. Serum creatinine increase was observed in 300 mg once daily dosing group leading to dose discontinuation on day 5. In conclusion, it was demonstrated that the single doses and repeated doses of the ART‐001 dry syrup formulation, at up to 400 and 100 mg, respectively, were safe and tolerated with favorable PK profile, supporting further clinical development for the treatment of SFVMs.