A Phase I Study to Assess LBL-047 in Healthy Adults and Patients With Systemic Lupus Erythematosus

This is a double-blind, randomized, placebo-controlled Phase I study to evaluate the safety, tolerability, PK, PD and immunogenicity of a single subcutaneous injection of LBL-047 in healthy adults and patients with systemic lupus erythematosus,the preliminary clinical efficacy of LBL-047 will also be evaluated in patients with systemic lupus erythematosus.

The study is divided into two parts.

Part A:Conduct studies in healthy adults.Part A is planned to be set up with 7 escalating dose groups.Participants were randomized to receive a single subcutaneous injection of LBL-047 or placebo.Dose escalation will be decided by the Safety Monitoring Committee (SMC).

Part B:Study in adult patients with systemic lupus erythematosus.Part B will be initiated at the dose levels that were confirmed to be safe and tolerable in Part A.Part B is planned to enroll patients with mild to moderate systemic lupus erythematosus and receive a single subcutaneous injection of LBL-047.

This study is expected to enroll 76 participants (with possible addition of 36 participants).

Inclusion criteria

• Voluntarily sign and date the informed consent form (ICF) and be willing and able to comply with the scheduled visits, treatment plan, laboratory test, and other study procedures.
• Age ≥ 18 and ≤ 60 years at the time of signing the ICF.
• Part A:Determined by the investigator to be in good health at the time of signing the ICF.
• Part B:Mild to moderate systemic lupus erythematosus: SLEDAI-2K score ≥4 and ≤ 10 at screening.
• Females of childbearing potential are willing to use highly effective contraception during the study and for 6 months after administration of the study drug and to avoid egg donation.Women of non-childbearing potential include: those with documented surgical sterilization or documented menopause.
• Male of childbearing potential are willing to use highly effective contraception during the study and for 6 months after study drug administration and to avoid sperm donation.Men without fertility potential include those with: A semen sample investigation that confirms azoospermia, definitive evidence of infertility, or a history of vasoligation.For the purpose of this study, men with a "low sperm count" (or "subfertility") are not considered infertile.

Exclusion criteria

• Part A:Symptoms or history of any significant disease, including but not limited to cardiovascular, hepatic, renal or any other disease that may interfere with the study results.
• Part A:Abnormalities with clinical significance were indicated by vital signs, physical examination, laboratory test, 12-lead electrocardiogram (ECG), chest X-ray, and abdominal ultrasound.
• Part B:History of organ transplant or hematopoietic stem cell/bone marrow transplant.
• Part B:currently receiving treatment for any chronic infection (such as pneumocystosis, cytomegalovirus, herpes simplex virus, herpes zoster and atypical mycobacteriosis).
• Major surgery (as judged by the investigator) within 90 days prior to dosing, or surgery scheduled during the study.
• At screening, women of childbearing potential were positive for pregnancy.follicle stimulating hormone (FSH) did not reach postmenopausal level in postmenopausal women (defined as amenorrhoea ≥ 12 months before screening).
• Large tattoo, scar or other condition that may interfere with assessment at the injection site.
• unable to tolerate venipuncture, difficulty in blood collection or has a history of needle/blood phobic disorder.
• The investigator determines that there are other conditions unsuitable for participation in this study.