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Quantitative Prediction of Human Pharmacokinetics for Monoclonal Antibodies

Retrospective Analysis of Monkey as a Single Species for First-in-Human Prediction

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Abstract

Background and Objectives

Prediction of human pharmacokinetics for monoclonal antibodies (mAbs) plays an important role for first-in-human (FIH) dose selection. This retrospective analysis compares observed FIH pharmacokinetic data for 16 mAbs to those predicted in humans based on allometric scaling of Cynomolgus monkey pharmacokinetic data.

Methods

Ten mAbs exhibited linear pharmacokinetics in monkeys based on non-compartmental analysis. For these, simple allometric scaling based on bodyweight was applied to predict human clearance (CL) and volume of distribution (Vd) from those obtained in monkeys. Six mAbs exhibited nonlinear pharmacokinetics in monkeys based on population modelling. For these, a population modelling approach using nonlinear mixed-effects modelling software, NONMEM®, was applied to describe monkey data by a two-compartment pharmacokinetic model with parallel linear and nonlinear elimination from the central compartment. The pharmacokinetic parameters in monkeys were then scaled to humans based on simple allometry. Human concentrationtime profiles of these mAbs were then simulated and compared with those observed in the FIH studies.

Results

Antibodies with linear elimination in monkeys also exhibited linear elimination in humans. For these, observed CL and Vd were predicted within 2.3-fold by allometry. The predictability of human peak serum concentration (Cmax) and area under the serum concentration-time curve (AUC) for mAbs with nonlinear pharmacokinetics in monkeys was, however, concentration dependent. Cmax was consistently overestimated (up to 5.3-fold higher) when below the predicted Michaelis-Menten constant (Km; range 0.3–4 μg/mL). The prediction of human Cmax was within 2.3-fold when concentrations greatly exceeded Km. Similarly, differences between predicted human AUCs and those observed in the FIH studies were much greater at low doses/concentrations. Consequently, predicted drug exposure in humans at low starting doses (range 0.01–0.3 mg/kg) in FIH studies was poorly estimated for three of six mAbs with nonlinear pharmacokinetics.

Conclusions

Allometric prediction of human pharmacokinetics may be sufficient for mAbs that exhibit linear pharmacokinetics. For mAbs that exhibited nonlinear pharmacokinetics, the best predictive performance was obtained after doses that achieved target-saturating concentrations.

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Acknowledgements

No source of funding was used to assist in the preparation of this manuscript. The authors wish to thank Dr Marc Gastonguay for insightful technical discussion and Dr Donald Mager for critical review of the manuscript. All authors are employees of Amgen and own Amgen shares. The authors have no other conflicts of interest that are directly relevant to the content of this study.

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Correspondence to Megan Gibbs.

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Dong, J.Q., Salinger, D.H., Endres, C.J. et al. Quantitative Prediction of Human Pharmacokinetics for Monoclonal Antibodies. Clin Pharmacokinet 50, 131–142 (2011). https://doi.org/10.2165/11537430-000000000-00000

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