Patient-centric microsampling for abrocitinib pharmacokinetics: multiple-analytes assay bridging using Tasso device

Aim: The feasibility of using Tasso devices (Tasso-SST^® and Tasso⁺) collecting capillary blood samples for measuring abrocitinib and its metabolites were evaluated, and assay concordance established between capillary and venous blood samplings. Methods: Capillary serum and venous plasma concentrations were measured using their respective qualified and validated assays. Concentration and exposure comparisons were conducted for abrocitinib and its metabolites (M1, M2 and M4) to establish assay concordance. Results: The correlation coefficient between capillary serum and venous plasma concentrations were >0.98 for all four analytes from three separate assays, and PK parameters (AUC_last and C_max) were compared and met bioequivalence criteria. Conclusion: These results demonstrate the feasibility of patient-centric microsampling device, such as Tasso, in future abrocitinib pediatric study.