This study plans to enroll 148 patients with heterozygous familial hypercholesterolemia, and maintain a low-fat diet and stably take the current anterior-lowering therapy for at least 4 weeks. Randomly enter different dose groups at 1:1. 2: 1 randomized to receive subcutaneous injection of IBI306150 mg (n=49) or placebo (n=25) every two weeks: or subcutaneous injection of IBI306 450mg (n=49) or placebo (n=25) every four weeks , The treatment lasted 12 weeks. During randomization, the LDL-C level (<4.8mmol/L or ≥4.8mmol/L) observed during the screening period visit (VI), and whether ezetimibe was used for stratification. After 12 weeks, each group entered the 12-week open-period treatment, in which subjects in the IBI306 group continued to receive IBI306 treatment, and subjects in the placebo group stopped using placebo and received IBI306 treatment. The primary endpoint was the percentage change in LDL-C levels from baseline at 12 weeks. The secondary endpoints were the changes in blood lipid levels from baseline at 12 and 24 weeks, drug safety, and immunogenicity. The exploratory endpoint is the population pharmacokinetic characteristics of IBI306 in Chinese heterozygous familial hypercholesterolemia population. If necessary, the dose of IBI306 will be adjusted according to the results of the ongoing multi-dose climbing study. After the open period, the subjects will undergo an 8-week safety visit.
This study plans to enroll several patients with heterozygous familial hypercholesterolemia, randomly assigned to different dose groups, and randomly receiving subcutaneous injection of IBI306150 mg or placebo every two weeks: or subcutaneous injection of IBI306 450mg every four weeks (n=49) or placebo (n=25) treatment, treatment lasted for 12 weeks. During randomization, the LDL-C level (<4.8mmol/L or ≥4.8mmol/L) observed during the screening period visit (VI), and whether ezetimibe was used for stratification. After 12 weeks, each group entered the 12-week open-period treatment, in which subjects in the IBI306 group continued to receive IBI306 treatment, and subjects in the placebo group stopped using placebo and received IBI306 treatment. The exploratory endpoint is the population pharmacokinetic characteristics of IBI306 in Chinese heterozygous familial hypercholesterolemia population.