A Clinical Trial in Healthy Volunteers and Patients With Mild Asthma to Investigate a New Medicine (AZD4604) for the Treatment of Asthma

Inclusion criteria: All Study Parts: * Provision of signed and dated, written informed consent prior to any study specific procedures. * Female subjects must have a negative pregnancy test at the Screening Visit and on admission to the Study Center or prior to randomization for Part 3 (Day -1 or Day 1 visit) and must not be lactating. Women of non-childbearing potential, must fulfill one of the following criteria: * Postmenopausal defined as amenorrhea for at least 12 months or more following cessation of all exogenous hormonal treatments and follicle stimulating hormone levels in the postmenopausal range. * Documentation of irreversible surgical sterilization by hysterectomy, bilateral oophorectomy or bilateral salpingectomy but not bilateral tubal ligation. * Male subjects and their Women of childbearing potential (WOCBP) partners should be willing to use highly effective contraception measures and should refrain from donating sperm or fathering a child from the first day of dosing until 3 months after the last dose of investigational medicinal product (IMP). * WOCBP must be willing to use highly effective contraception measures from the first day of dosing until at least 1 month after the last dose of IMP, such as measures that results in low failure rate, ie, less than 1% per year. Part 1a, Part 1b, and Part 2 Only: * Healthy male and female (including WOCBP) volunteers aged 18 to 55 years with suitable veins for cannulation or repeated venipuncture. * Have a BMI…