Evaluate the Efficacy and Safety of IBI306 in Subjects With Homozygous Familial Hypercholesterolemia

IBI306 is a bio-innovative drug against proprotein convertase subtilisin 9 (PCSK-9) monoclonal antibody. Currently, cholesterol-lowering drugs with multiple mechanisms of action are on the market or under development. Among them, anti-PCSK-9 monoclonal antibodies have received widespread attention due to their good safety and efficacy. The results of existing preclinical studies show that IBI306 has a clear structure, good stability, and is not inferior to other drugs of its kind in terms of drug activity, animal pharmacokinetics (PK)/pharmacodynamics (PD) and safety. This study is divided into two phases: the dose exploration phase (the first phase) and the confirmatory phase (the second phase). Each stage is divided into screening period, treatment period, and safety follow-up period. The first phase of this research is the randomized design of open labels. The second stage is an open, single-arm design. The main purpose of the first phase of the study: to evaluate the tolerability and safety of multiple-dose repeated administration of IBI306 in the Chinese population with hypercholesterolemia, and to recommend the dose for the second phase. The main purpose of the second phase of the study: to evaluate the effectiveness of IBI306 in the Chinese homozygous familial hypercholesterolemia population. Secondary research purpose: To evaluate the safety and immunogenicity of IBI306 in Chinese homozygous familial hypercholesterolemia population.