A Study to Evaluate AZP531 in Healthy Volunteers, Overweight/Obese Volunteers and Patients With Type 2 Diabetes Mellitus

Inclusion Criteria: * Part A: Healthy male volunteers, aged 18 to 50 years (inclusive) with a body mass index (BMI) of 20 to 28 kg/m2 (inclusive). * Part B: Female (of non-childbearing potential) and male overweight/obese volunteers, aged 18 to 65 years (inclusive) with a BMI of 28 to 38 kg/m2 (inclusive). * Part C: Female (of non-childbearing potential) and male patients with a confirmed diagnosis of type 2 diabetes mellitus for at least 3 months Exclusion Criteria: * Part A: Females and male volunteers who smoke and/or use other nicotine products within 6 months of screening are excluded. * Part B: Current or ex-smokers with a smoking history of greater than 10 pack years (1 pack year = 20 cigarettes smoked per day for 1 year) and any clinically significant abnormalities in physical examination, electrocardiogram (ECG), clinical chemistry, haematology, coagulation or urinalysis results at screening or on admission, as judged by the Investigator. * Part C: Current or ex-smokers with a smoking history of greater than 10 pack years (1 pack year = 20 cigarettes smoked per day for 1 year), any clinically significant abnormalities other than those attributed to type 2 diabetes mellitus in physical examination, ECG, clinical chemistry, haematology, coagulation or urinalysis results at screening or on admission, as judged by the Investigator, and estimated glomerular filtration rate \<40 mL\*min-1\*1.73m-2 calculated by the Modification of Diet in Renal Disease formula.