Study to Evaluate the Pharmacokinetics and Pharmacodynamics of AZD4604 Given Via the Turbuhaler® Device in Adults With Mild Asthma.

Main Inclusion Criteria: * Participant must be 18 to 65 years of age inclusive with suitable veins for cannulation or repeated venepuncture. * Participants must have Physician-diagnosed mild asthma for at least 6 months prior to Screening Visit. * ≥ 70% predicted for FEV1 at the Screening Visit AND on Day -1. * Have a FeNO of ≥ 40 ppb at the Screening Visit and on Day -2. * Body weight at least 50 kg and BMI within the range 18 to 35 kg/m2 (inclusive). * Female participants must have a negative pregnancy test at the Screening Visit and on admission to the clinical site or prior to randomisation and must not be lactating. However, there are no restrictions on male participants or their female partners. * Contraceptive use by females should be consistent with local regulations regarding the methods of contraception for those participating in clinical studies. * Capable of giving signed and dated informed consent prior to any study-specific procedure. Main Exclusion Criteria: * History of any clinically important disease or disorder which, in the opinion of the Principal Investigator (PI), may either put the participant at risk because of participation in the study, or influence the results or the participant's ability to participate in the study. * History of cancer within the last 10 years (20 years for breast cancer) except for basal and squamous cell carcinoma of the skin or in situ carcinoma of the cervix treated and considered cured. Any history of lymphoma is not allow…