A randomized, double-blind and parallel group study to compare the pharmacokinetic, safety and pharmacodynamic of QL1206 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 and subcutaneous injections of QL1206 or Xgeva® in healthy volunteers.

The secondary objective are to assess the Clinical safety and immunogenicity similarity of single and subcutaneous injections of QL1206 or Xgeva® in healthy volunteers.

Meanwhile，observing the pharmacodynamic similarities of QL1206 or Xgeva® preliminarily.

Subjects would receive a single 120mg（1.7ml） of QL1206 or through subcutaneous injection.

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;
• Aged ≥18 years or ≤50 years, male or female (including the boundary value);
• Agree to take effective contraceptive measures throughout the study period (including not limited to: hormonal drugs of pregnancy, physical contraception, surgery, abstinence, etc., until at least 6 months after the last study 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.
• Serum calcium levels are outside the normal range of the laboratory, or the subject uses calcium supplements in the screening period.
• 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;
• Subject has viral hepatitis (including hepatitis B and hepatitis C), AIDS antibodies, and Treponema pallidum antibodies;