A Study to Evaluate the Safety, Tolerability, Pharmacokinetics (PK), and Immunogenicity of APG777 in Adults With Asthma

Prior treatment

• Any asthma exacerbation requiring systemic corticosteroids within 12 weeks of Screening and/or any asthma exacerbation that resulted in overnight hospitalization within 6 months prior to Screening

Other illness

• Any history of life-threatening asthma, defined as an asthma episode that required intubation and/or was associated with hypercapnia
• History of biologics use for treatment or control of asthma
• Current smokers or participants with a smoking history of ≥ 10 pack years
• Known history of illicit drug abuse, harmful alcohol use
  • Note: Other protocol defined criteria may apply.

• Have a diagnosis of mild-to-moderate asthma (Global Initiative for Asthma 2023 criteria) ≥ 1 year prior to Screening
• Maintain FeNO-high (≥ 25 parts per billion \[ppb\]) or FeNO-low (\< 25 ppb) status from Screening to Day 1 prior to Randomization
• Pre-bronchodilator forced expiratory volume in 1 second (FEV1) ≥ 60% of predicted normal value at Screening
• Asthma Control Test (ACT) score \> 19 at Screening
• Maintained control on as-needed short-acting beta-agonist (SABA) +/- stable dose inhaled corticosteroids (ICS) or stable dose of ICS/ long-acting beta-agonist (LABA); +/- stable dose leukotriene receptor antagonist (LTRA). ICS dose should be stable for ≥ 12 weeks prior to Day 1, LTRA dose should be stable for ≥ 8 weeks prior to Day 1
• Women of childbearing potential and male participants to use a highly effective form of contraception