Efficacy and Safety of Inhaled AZD1402 Administered for Four Weeks in Adults With Asthma on Medium-to-High Dose Inhaled Corticosteroids

This is a randomised, placebo-controlled, double-blinded, multi-centre, 2-part study to assess the efficacy and safety of inhaled AZD1402. Part 1 will be performed in a Lead-in Cohort for each dose level to evaluate the safety and pharmacokinetics (PK) in a population with asthma controlled on medium dose inhaled corticosteroids (ICS)-long acting beta agonists (LABA) before progressing to dosing in adults with asthma who are uncontrolled on medium-to-high dose ICS-LABA in Part 2. The study will recruit participants receiving treatment with medium dose ICS with LABA for Part 1 and participants receiving treatment with medium-to-high dose ICS with LABA for Part 2 (separate inhalers or combination product). Part 2 will be initiated following evaluation of safety and PK at the relevant dose level in Part 1a. The entire study period for each participant in both Parts 1 and 2, is approximately 3.5 months; a 2-week Screening Period, a 4 week Run-in Period, 4 weeks of Treatment Period, and 4 weeks of Follow-Up Period.