A Study to Evaluate the Safety, Tolerability, and Pharmacokinetics of PB-718 Injection in Chinese Obese Subjects.

The trial is conducted in a single center, randomized, double blind, placebo controlled, dose increasing design. To evaluate the safety, tolerability, PK characteristics, efficacy and immunogenicity of PB-718 injection in Chinese obese subjects. The study consists of three dose groups, each of which is planned to include 12 subjects (9 receiving the study drug and 3 receiving placebo), for a total of 36 patients. Subjects will receive 12 weeks（for cohort 1 and 2） or 18 weeks(for cohort 3) of treatment after screening and complete 8 weeks of safety follow-up.

Inclusion criteria

• Chinese male or female subjects aged 18-60 years (both inclusive).
• Body weight ≥70 kg(male) or 60 kg(female), and body mass index (BMI) ≥28.0 kg/m2 at screening.
• Weight change <5% in the past 3 months before screening.

Exclusion criteria

• FPG ≥7.0mmol/L or glycosylated hemoglobin (HbA1c) ≥6.5% or diagnosed diabetes
• FPG <3.9 mmol/L at screening and/or a history of hypoglycemia.
• History of Cushing's syndrome, polycystic ovaries, or other hereditary endocrine disorders, or obesity caused by secondary factors such as cortisol hormones.
• Abnormal Thyroid-Stimulating Hormone(TSH), free triiodothyronine(FT3), Free thyroxine(FT4) or diagnosed thyroid dysfunction
• History of multiple endocrine neoplasia syndrome type 2 (MEN-2) or medullary thyroid carcinoma (MTC).
• Diagnosed cardiovascular and cerebrovascular diseases with obvious clinical significance within 6 months before screening
• Systolic blood pressure > 160 mmHg and/or diastolic blood pressure > 100 mmHg at screening or randomization.
• PR intervals > 210 msec and/or QRS wave group time limit > 120 msec and/or Corrected QT interval using Fridericia's formula（QTcF）> 450 msec at screening or randomization.
• Serum amylase or lipase > 3× upper limit of normal (ULN) at screening or before randomization, or previously diagnosed acute/chronic pancreatitis.
• Low density lipoprotein cholesterol(LDL-C) ≥4.40 mmol/L or triglyceride (TG) ≥5.65 mmol/L.
• Use of any approved or unapproved drugs or products that have an effect on body weight within 3 months prior to screening
• History of bariatric surgery for weight loss 1 year before screening.