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Pharmacokinetics and tolerability of the new second-generation nonnucleoside reverse- transcriptase inhibitor KM-023 in healthy subjects

Authors Cha YJ, Lim KS, Park MK, Schneider S, Bray B, Kang MC, Chung JY, Yoon SH, Cho JY, Yu KS

Received 6 April 2014

Accepted for publication 6 May 2014

Published 26 September 2014 Volume 2014:8 Pages 1613—1619

DOI https://doi.org/10.2147/DDDT.S65596

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Yu-Jung Cha,1,* Kyoung Soo Lim,2,* Min-Kyu Park,1 Stephen Schneider,3 Brian Bray,3 Myung-Chol Kang,3 Jae-Yong Chung,1 Seo Hyun Yoon,1 Joo-Youn Cho,1 Kyung-Sang Yu1

1Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, South Korea; 2Department of Clinical Pharmacology and Therapeutics, CHA University School of Medicine and CHA Bundang Medical Center, Seongnam, South Korea; 3Kainos Medicine USA Inc., Morrisville, NC, USA

*These authors contributed equally to this work

Background: KM-023 is a new second-generation nonnucleoside reverse-transcriptase inhibitor that is under development for the treatment of human immunodeficiency virus (HIV) type 1 infection.
Objective: This study determined KM-023 tolerability and pharmacokinetic characteristics in healthy subjects.
Materials and methods: A randomized, double-blinded, placebo-controlled, dose-escalation study was conducted in 80 healthy South Korean male volunteers. The subjects were allocated to single- or multiple-dose (once daily for 7 days) groups that received 75, 150, 300, or 600 mg drug or placebo in a 4:1 ratio. Safety and pharmacokinetic assessments were performed during the study. Plasma and urine concentrations were quantified using liquid chromatography–tandem mass spectrometry.
Results: The average maximum concentration (Cmax) and area under the concentration–time curve from time 0 to infinity (AUC) values of KM-023 for the 75–600 mg doses in the single-dose study ranged from 440.2 ng/mL to 1,245.4 ng/mL and 11,142.4 ng • h/mL to 33,705.6 ng • h/mL, respectively. Values of the mean Cmax at a steady state and AUC within the dosing interval ranged from 385.1 ng/mL to 1,096.7 ng/mL and 3,698.9 ng • h/mL to 10,232.6 ng • h/mL, respectively, following 75–600 mg doses in the multiple-dose study. Dose proportionality was not observed for KM-023. KM-023 showed a 0.6-fold accumulation after multiple doses in the 600 mg dose group. The mean half-life values ranged between 20.7 and 31.2 hours. KM-023 was generally well tolerated without serious adverse events.
Conclusion: KM-023 demonstrated dose- and time-dependent nonlinear pharmacokinetic characteristics after single or multiple doses over a dose range (75–600 mg) in healthy subjects. KM-023 showed favorable tolerability in this study. This Phase I clinical trial information can be used to design further clinical studies appropriately to evaluate KM-023 in patients with HIV-1 infection.

Keywords: KM-023, HIV-1, nonnucleoside reverse-transcriptase inhibitor, pharmacokinetics, tolerability, healthy subjects

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