A randomized, double-blind and parallel group study to compare the pharmacokinetic, pharmacodynamic, safety and immunogenicity of HS-20090 120mg（1.7ml）and Xgeva® in healthy adults.

This is a phase I, single center, randomized, double-blind and parallel group clinical trial .

The primary objective is to assess the pharmacokinetic similarity of single subcutaneously injection of HS-20090 or Xgeva® in healthy volunteers.

The secondary objectives are to assess the Clinical safety and immunogenicity similarity of single subcutaneously injection of HS-20090 or Xgeva® in healthy volunteers. Meanwhile，observing the pharmacodynamic similarity of HS-20090 to Xgeva® preliminarily.

Inclusion Criteria:

• Sign the informed consent form and fully understand the test content, process and possible adverse reactions, and be able to complete the study according to the test plan requirements;
• Healthy males, Aged ≥18 years or ≤50 years old(including the boundary value);
• Agree to take effective contraceptive measures throughout the study period until at least 6 months after the last drug is administered;
• Clinical laboratory examination, chest X-ray, abdominal B-ultrasound, electrocardiogram, physical examination, vital signs and various examinations are normal or abnormal without clinical significance.

Exclusion Criteria:

• Occurred or suffering from osteomyelitis or ONJ (mandibular necrosis) previously; The dental or jaw disease that is active, requiring oral surgery; or planned for invasive dental surgery during the study; or dental or oral surgery wounds have not healed;
• Serum calcium levels are outside the normal range of the laboratory.
• Subject has positive pre-study Hepatitis B surface antigen or positive Hepatitis C antibody result viral hepatitis (including hepatitis B and hepatitis C), or positive HIV antibodies, or positive test for syphilis.
• The subject has participated in a clinical trial and has received an investigational product within the following time period prior to the first dosing day in the current study: 3 months or 5 half-lives (whichever is longer).
• Prior use of medications within 6 months before and during the study. This includes medications such as, but not limited to: Bisphosphonates Fluoride Calcitonin Strontium Parathyroid hormone or derivatives Supplemental vitamin D (>1000 IU/day) Glucocorticosteroids (topical corticosteroids administered more than 2 weeks prior to enrolment are allowed) Anabolic steroids Calcitriol Diuretics