Model-based dose selection for phase III rivaroxaban study in Japanese patients with non-valvular atrial fibrillation.
The global ROCKET AF phase III trial evaluated rivaroxaban 20 mg once daily (o.d.) for stroke prevention in atrial fibrillation (AF). Based on rivaroxaban pharmacokinetics in Japanese subjects and lower anticoagulation preferences in Japan, particularly in elderly patients, the optimal dose regimen for Japanese AF patients was considered. The aim of this analysis was dose selection for Japanese patients from a pharmacokinetic aspect by comparison of simulated exposure in Japanese patients with those in Caucasian patients. As a result of population pharmacokinetics-pharmacodynamics analyses, a one-compartment pharmacokinetic model with first-order absorption and direct link pharmacokinetic-pharmacodynamic models optimally described the plasma concentration and pharmacodynamic models (Factor Xa activity, prothrombin time, activated partial thromboplastin time, and HepTest), which were also consistent with previous works. Steady-state simulations indicated 15 mg rivaroxaban o.d. doses in Japanese patients with AF would yield exposures comparable to the 20 mg o.d. dose in Caucasian patients with AF. In conclusion, in the context of the lower anticoagulation targets in Japanese practice, the population pharmacokinetic and pharmacodynamic modeling supports 15 mg o.d. as the principal rivaroxaban dose in J-ROCKET AF.
Development Clinical Pharmacology Asia, Bayer Yakuhin Ltd., Osaka, Japan. takahiko.tanagawa@bayer.com
Takahiko
T
Tanigawa
Masato
M
Kaneko
Kensei
K
Hashizume
Mariko
M
Kajikawa
Hitoshi
H
Ueda
Masahiro
M
Tajiri
John F
JF
Paolini
Wolfgang
W
Mueck
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000925:Anticoagulants / Q000008:administration & dosage*; D019540:Area Under Curve; D001281:Atrial Fibrillation / Q000097:blood / Q000188:drug therapy*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D009025:Morpholines / Q000008:administration & dosage* / Q000493:pharmacokinetics; D010314:Partial Thromboplastin Time; D016544:Patient Simulation; D011517:Prothrombin Time; D000069552:Rivaroxaban; D013876:Thiophenes / Q000008:administration & dosage* / Q000493:pharmacokinetics
D000925:Anticoagulants; D009025:Morpholines; D013876:Thiophenes; D000069552:Rivaroxaban