A Phase I, Open-label, Single-Dose Study to Evaluate the Pharmacokinetics, Safety, and Tolerability of AMG 986 in Healthy Japanese Subjects.

Background And Objective: AMG 986 is a first-in-class, novel apelin receptor small molecule agonist initially developed as a treatment for patients with heart failure (HF). Previously, a first-in-human study of AMG 986 was conducted in healthy and HF subjects; however, AMG 986 was not evaluated in Japanese subjects.

Methods: This was a phase I, open-label, single-dose, single-center study conducted to evaluate the safety and pharmacokinetics (PK) of AMG 986 200 mg and 400 mg in 12 healthy Japanese subjects. Six subjects received AMG 986 200 mg and six subjects received AMG 986 400 mg.

Results: Following oral administration, median time to maximum observed plasma concentration (t) was 1.0 h for both the AMG 986 200 mg and 400 mg groups, and mean terminal half-life (t) was 15.1 h and 17.6 h, respectively. When comparing the AMG 986 200 mg and 400 mg groups, 1.33-fold and 1.18-fold higher maximum observed plasma concentration (C) and AUC, respectively, were observed for the 2-fold increase in dose. AMG 986 exhibited an acceptable safety and tolerability profile; all adverse events were mild in severity.

Conclusion: AMG 986 exposure increased with increasing dose, and the increase was less than dose proportional in healthy Japanese subjects. The results of this study could facilitate the subsequent clinical development of AMG 986 for the treatment of Japanese patients with HF.