A Phase Ia Single Ascending-Dose Study of Subcutaneous EB070 Injection in Healthy Volunteers

Inclusion criteria

• Age: 18 to 60 years old.
• Sex: Healthy male and female participants.
• Body weight: ≥50 kg for males and ≥45 kg for females; body mass index (BMI = weight [kg] / height [m²]) between 18 and 26 kg/m².
• Participants of reproductive potential (both male and female) must agree to use reliable contraception (hormonal, barrier method, or abstinence) during the study and for at least 3 months after study completion. Female participants of childbearing potential must have a negative pregnancy test (β-HCG) at screening and baseline and must not be breastfeeding.
• Informed consent: Participants must have been adequately informed about the study, voluntarily sign the informed consent form, and be willing and able to comply with study procedures.

Exclusion criteria

• Abnormal findings at screening in physical examination, vital signs, 12-lead ECG, or laboratory tests (including hematology, urinalysis, blood biochemistry, coagulation function, and thyroid function) deemed clinically significant by the investigator.
• Positive serology for any of the following: hepatitis B surface antigen, hepatitis C antibody, syphilis antibody, or HIV antigen/antibody.
• History of any clinically significant disease affecting the respiratory, digestive, cardiovascular, hematologic/lymphatic, nervous, psychiatric, genitourinary, endocrine, hepatic, renal, dermatologic, or metabolic systems, or any other condition that could interfere with study results.
• Blood pressure at screening: systolic ≥140 mmHg or <90 mmHg, or diastolic ≥90 mmHg or <50 mmHg.
• Planned major surgery during the study, or major surgery within 1 month prior to randomization.
• History of chronic infection, particularly bacterial, viral, fungal, or parasitic infection within 1 month prior to randomization.
• Known allergy to EB070 or any excipients, history of hypersensitivity to antibody-based biologics, or history of specific allergic conditions (e.g., allergic conjunctivitis, allergic asthma, atopic dermatitis), or any clinically significant food, drug, insect bite, foreign protein, or monoclonal antibody allergy as judged by the investigator.
• Alcohol abuse: ≥28 standard drinks per week within 1 year prior to randomization, or frequent drinking (>14 standard drinks/week) within 6 months prior to randomization; or failed breath alcohol test (>0 mg/100 mL) at screening or Day 1. (One standard drink contains 14 g alcohol, e.g., 360 mL beer, 45 mL 40% liquor, or 150 mL wine.)
• Smoking ≥5 cigarettes per day or equivalent tobacco use (e.g., nicotine gum/lozenges) within 3 months prior to randomization, inability to abstain during the study, or positive urine cotinine test at screening or Day 1.
• Participation in any clinical trial of an investigational drug within 3 months prior to randomization (or within 5 half-lives, whichever is longer).
• Use of any medications or dietary supplements (prescription, over-the-counter, herbal, or traditional Chinese medicine) within 14 days prior to randomization, or within 5 half-lives of the study drug.
• Use of any biologic products within 3 months prior to randomization (or within 5 half-lives, whichever is longer).
• Administration of live or attenuated vaccines within 1 month prior to randomization or planned during the study.
• History of substance abuse (e.g., morphine, cannabis, methamphetamine, MDMA, ketamine) within 1 year prior to randomization, or positive urine drug screen at screening or Day 1.
• Blood donation or significant blood loss (≥400 mL) within 3 months prior to randomization, or planned donation during the study or within 3 months after study completion.
• History of syncope or needle phobia, or inability to tolerate blood draws.
• Positive interferon-gamma release assay (T-SPOT.TB). Subjects without tuberculosis history or symptoms may be included if results are within twice the upper limit of normal.
• Any other condition that the investigator judges makes the participant unsuitable for the study.