A three-arm clinical study to compare pharmacokinetic and pharmacodynamic similarity of the denosumab biosimilar LY06006 with reference denosumab in healthy male subjects

BackgroundThis study aimed to evaluate the pharmacokinetic (PK), pharmacodynamic (PD) similarity, comparable safety, and immunogenicity between LY06006, European Union-sourced denosumab (EU-DEN), and United States-sourced denosumab (US-DEN).Research design and methodsIn this double-blind, parallel-group, and single-dose study, 300 healthy male subjects were randomized 1:1:1 to receive a 60 mg dose of either LY06006, EU-DEN, or US-DEN subcutaneously. This study lasted for 253 days. Primary PK endpoints included maximum serum concentration (Cmax), area under the concentration-time curve (AUC) from time zero to last quantifiable concentration (AUC0-t), and AUC from time zero to infinity (AUC0-inf). Pharmacokinetic equivalence was concluded if the two-sided 90% confidence interval (CI) for the geometric least squares mean ratio (GLSMR) of primary endpoints were within 80%-125%. Other PK parameters, PD parameters, safety, and immunogenicity assessments were also conducted during the study.ResultsThe 90% CIs for ratios of GLSMR were within the predefined equivalence margin for AUC0-inf (89.0%-111.1%), AUC0-t (89.7%-111.3%), and Cmax (92.3%-106.7%). The PD parameters, safety, and immunogenicity of LY06006 were also comparable to US-DEN and EU-DEN.ConclusionLY06006 was highly similar to US-DEN and EU-DEN in terms of PK, PD, safety and immunogenicity in healthy male subjects.Clinical trial registrationwww.clinicaltrials.gov identifier is NCT06095427