The aim of this study is to investigate the safety and tolerability of HB0034 in healthy subjects following a single dose or multiple dose.

This study consisted of a single-dose escalation study and a multi-dose escalation study to evaluate the safety, tolerability, pharmacokinetics, and immunogenicity of HB0034 in Chinese healthy subjects.

Inclusion Criteria:

• Healthy male or female subjects age ≥ 18 and ≤ 55 years.
• Body Mass Index (BMI) ≥ 17.5 and ≤ 32 kg/m².
• Normal ECG, blood pressure, respiratory rate, temperature, and heart rate, unless the investigator considers any abnormality to be not clinically significant.

Signed and dated written informed consent prior to admission to the study in accordance with GCP and local legislation.

Exclusion Criteria:

- History of clinically significant cardiovascular, respiratory, hepatic, renal, gastrointestinal, endocrine, hematological, psychiatric, or neurological disease.

Current or history of malignancy. • Family history of premature Coronary Heart Disease (CHD)

• History of clinically significant opportunistic infection (e.g., invasive candidiasis or pneumocystis pneumonia).
• Pregnant or Breasting feeding subject. Women with a positive pregnancy test.
• Further exclusion criterias apply.