The PK/PD Study of A Single Subcutaneous Injection of SHR-1222 in Healthy Subjects

This is a Single Center, Randomized, Double-Blind, Dose Escalation, Placebo Parallel Controlled PhaseⅠClinical study to Evaluate the Safety, Tolerability and Pharmacokinetics, Pharmacodynamics with A Single Subcutaneous Injection of SHR-1222 in Healthy Subjects.

The primary objective of this study is to investigate the safety and tolerability of a range of subcutaneous SHR-1222 in healthy subjects. Secondary objectives are to determine the pharmacokinetics (PK) and pharmacodynamics(PD) profile of SHR-1222 in healthy subjects including assessment of immunogenicity.

50 adult healthy subjects with 5 dose groups will be enrolled in the study, including six subjects in the lowest dose group, four of whom received the SHR-1209 and two of whom received the placebo. The other three groups have 11 subjects in each group, 9 administered SHR-1222 and 2 administered placebo. The primary endpoint is the Safety and Tolerability : adverse events, vital signs, physical examination, laboratory examination, 12 lead electrocardiogram, injection site reactions, etc.

Eligibility Criteria:
Inclusion Criteria:

* Signed informed consent;
* Male or postmenopausal female;
* Age ≥45 and ≤59 years old;
* The body mass index (BMI) ≥18.5kg/m2 and ≤28 kg/m2;
* T value of areal bone mineral density on any lumbar spine (L1-L4) or collum femoris\>-2.5 and \<-1;
* The comprehensive physical examination is eligible or slightly abnormal but the researchers determine no clinical implication;
* No smoking, alcohol or drugs abuse.

Exclusion Criteria:

* Any disease affecting bone metabolism;
* Past medical history of cerebral infarction or cerebral arterial thrombosis;
* Past medical history of myocardial infarction;
* Administration of the following drugs within 6m: Hormone replacement therapy, Calcitonin Parathyroid hormone (or any derivative), Supplemental Vitamin D\>1,000 IU/day, Glucocorticosteroids (inhaled or topical corticosteroids administered more than 2 weeks before the enrollment date are allowed), Anabolic steroids, Calcitriol and available analogues, thiazide diuretics;
* Administration of the following drugs within 12m: Bisphosphonates, Fluoride for osteoporosis;
* A bone fracture within the previous 6 months;
* A lumbar spine L1-L4 or femoral neck T-score ≤-2.5;
* Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) or gamma pancreatic acyl transferase (GGT) or total bilirubin, more than 1.5 x ULN during screening;
* 3 months prior to screening involved in any drug clinical subjects;
* Subjects determined by the researchers have any food, dietary supplement or drugs that affect SHR-1222 absorption, distribution, metabolism and excretion in 4 weeks prior to screening or within 5 half-lives;
* Serious infection, trauma or major surgery in 4 weeks prior to screening;
* A surgery plan during the study;
* Blood donation and transfusion in 3 months prior to screening;
* Unstable thyroid dysfunction in 6 months prior to screening;
* Human immunodeficiency virus antibody (HIV-ab), syphilis serological examination, hepatitis b virus surface antigen (HBsAg), hepatitis c virus antibody (HCV-ab) were positive;
* Intolerant to venous blood collection;
* A clinical history of drug allergy or a history of atopic allergic diseases (asthma, urticaria, eczema dermatitis) or a known allergy to experimental or similar
* Subjects with any other situation should not be involved, which determined by the researchers.