A randomized, double-blind, placebo-controlled study to evaluate the efficacy and safety of 24 once-weekly subcutaneous doses of PB-119 in Drug-naïve T2DM Subjects.

The study included a maximum 2-week screening period, a 4-week single-blind introduction period, a 24-week double-blind treatment period, a 28-week open extension treatment period, and a 4-week safety follow-up period.

At the end of the single-blind entry period, eligible subjects were randomly assigned to two different administration groups in a 1:1 ratio and received a 24-week double-blind treatment.

All subjects who completed the double-blind treatment entered the open extension treatment phase.Open extension treatment with subcutaneous injection of 150μg PB-119 once a week for 28 weeks.

Safety follow-up was conducted 4 weeks after the end of treatment/completion of early exit visit in the open extension period.

Inclusion Criteria:

• Male or female, aged 18~75 years old;
• Confirmed T2DM patients meet the diagnostic criteria for type 2 diabetes published by WHO1999；
• 18.5 kg/m2 < BMI < 40.0 kg/m2 at screening;
• 7.5% ≤ HbA1c ≤ 11.0% at screening;
• 7.0% ≤ HbA1c ≤ 10.5% when the random;
• 18.5 kg/m2 < BMI < 40.0 kg/m2 during screening and before randomization

Exclusion Criteria:

• T1DM;
• Continuous use of insulin for more than 14 days within 1 year before screening or before randomization；
• Treatment with any dipeptidylpeptidase 4 (DPP-4) inhibitor or glucose-dependent insulin-stimulating peptide (GIP) or/and glucagon-like peptide-1 (GLP-1) receptor agonist prior to screening or randomized prior treatment；
• Screening for any of the following heart diseases within the first 6 months or before randomization；
• Patients whose hypertension was not effectively controlled during screening or before randomization (after resting ≥5 minutes, systolic blood pressure ≥160mmHg and/or diastolic blood pressure ≥100mmHg)；
• Serum amylase or lipase >3×ULN or those with previous diagnosis of acute/chronic pancreatitis were screened or randomly screened；
• Screening for severe trauma or infection that may affect glycemic control within the first month or before randomization；
• A history or family history of medullary thyroid carcinoma (MTC) or multiple endocrine adenomatosis type 2 (MEN2)；
• Known to be allergic or intolerant to the study drug or metformin；
• Female subjects during pregnancy or lactation.