Curtis K. Johnston, Pharm.D.

Group Leader PKPD, Principal Scientist II

Curtis joined Metrum in 2014 after receiving his Pharm.D. from the University at Buffalo and completing a clinical PK/PD Fellowship through UNC Chapel Hill/Quintiles. His clinical experience includes infectious disease (bacterial), oncology, and chronic liver disease (HCV and NASH). Curtis’s research interests include Bayesian methodology and the application of M&S to help inform drug development decisions.

Recent publications by this scientist

Bayesian estimation in NONMEM

December 11, 2023

In this tutorial, the principles of Bayesian model development, assessment and prior selection are outlined. An example pharmacokinetic model is used to demonstrate the implementation of Bayesian modeling using the nonlinear mixed-effects modeling software NONMEM.

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Population Pharmacokinetic (PK) and Exposure-Response (ER) Analysis of Empagliflozin in Pediatric Patients with Type 2 Diabetes Mellitus (T2DM)

November 15, 2023

Presented at ACoP14. Empagliflozin, effective for type 2 diabetes in adults and children, underwent Study 1218.91 to assess its safety and efficacy over 26 weeks (with potential extension to 52 weeks) in children and adolescents. Using pediatric data from this study, researchers re-evaluated empagliflozin’s models in a Bayesian framework. Results showed similar drug exposure between children and adults at a 10 mg dose. At week 26, pediatric patients displayed a slightly larger but variable decrease in A1c compared to adults. This Bayesian method allowed insights into empagliflozin’s effects in children, drawing from knowledge gained in adult studies.

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Population Pharmacokinetic and Exposure-Response Analysis of Linagliptin in Pediatric Patients with Type 2 Diabetes Mellitus

November 15, 2023

Presented at ACoP14. This study assessed linagliptin’s effectiveness and safety in children and adolescents with type 2 diabetes over 26 weeks, potentially extending to 52 weeks. The study re-evaluated models developed for adults and adolescents to understand linagliptin’s impact on pediatric patients’ HbA1c levels. Results indicated slightly higher and more varied linagliptin exposure in children compared to adults at a 5 mg dose. Although pediatric patients had a smaller and variable HbA1c reduction versus adults at week 26, the Bayesian approach helped characterize linagliptin’s effects in children based on limited data, borrowing insights from adult studies.

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