A Study to Assess the Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of AZD6615 in Healthy Subjects

This study will be a randomized, single-blind, placebo-controlled, single-ascending dose (SAD), sequential group study. It is a SAD study in healthy Non-Asian subjects (Part 1) and healthy Japanese subjects (Part 2) to assess the safety and tolerability of AZD6615 and to characterize the pharmacokinetics (PK) of AZD6615.

This study part is planned to consist of 3 cohorts of Non-Asian subjects (Part 1) and 2 cohorts of Japanese subjects (Part 2). Part 2 will be initiated no earlier than after completion of the last Safety Review Committee (SRC) review in Part 1. Healthy male and/or female subjects aged 20 to 60 years will be included in both Parts 1 and 2 of the study. Female subjects must be of non-childbearing potential. Study Part 1 is planned to be conducted in 24 subjects but may be conducted in up to 40 subjects. Study Part 2 is planned to be conducted in 16 subjects but may be conducted in up to 32 subjects.

Within each cohort of Parts 1 and 2, 6 subjects will be randomized to receive AZD6615 and 2 subjects will be randomized to receive placebo. Dosing and food intake should be supervised and documented by study staff when subjects are in the clinic.

The study will comprise of:

* A Screening Period of maximum 28 days.
* A Dosing Session during which subjects will be resident at the Clinical Unit from the day before IMP administration (Day -1) until at least 78 hours after Investigational medicinal product (IMP) administration; discharged on Day 4.
* A Follow-Up Period of 12 weeks that will consist of 6 Follow-Up Visits, for which the subjects will return to the Clinical Unit at 2, 4, 6, 8, 10, and 12 weeks post-dose.

Within each cohort, site personnel remain blinded until the SRC meeting.

Following review of the data, the SRC may also decide to adjust the following for subsequent cohorts:

* The time window between the sentinel dose group and the main dose group in Part 1.
* The length of the stay at the study site, the timing and number of assessments and/or samples.
* The length of the follow-up period.
* The length of the data collection period for the SRC review.

Eligibility Criteria:
Inclusion Criteria:

1. Provision of signed and dated, written informed consent prior to any study specific procedures.
2. Females must have a negative pregnancy test at the Screening Visit and on admission to the Clinical Unit, must not be lactating and must be of non-child-bearing potential.
3. Provision of signed, written and dated informed consent for optional genetic research.

4: In Part 1: Healthy male and/or female Non-Asian subjects aged 20 - 60 years (inclusive at Screening Visit) with suitable veins for cannulation or repeated venipuncture. In Part 2: Healthy male and/or female Japanese subjects aged 20 - 60 years (inclusive at Screening Visit) with suitable veins for cannulation or repeated venipuncture.

5. Have a body mass index between 18 and 30 kg/m\^2 inclusive and weigh at least 50 kg and no more than 100 kg inclusive at the Screening Visit and Day -1.

6. Males should avoid fathering a child by either true abstinence or a highly effective contraception form of birth control during the study.

Exclusion Criteria:

1. History of any clinically important disease or disorder which, in the opinion of the Investigator, may either put the subject at risk because of participation in the study, or influence the results or the subject's ability to participate in the study.
2. History or presence of gastrointestinal, hepatic or renal disease or any other condition known to interfere with absorption, distribution, metabolism or excretion of drugs.
3. Subjects with known autoimmune disease or on treatment with immune-modulatory drugs.
4. Any clinically important illness, medical/surgical procedure or trauma within 4 weeks of the administration of investigational medicinal product.
5. Any laboratory values with the following deviations at the Screening Visit and/or Day -1, test may be repeated once for each visit at the discretion of the Investigator if out of range: (Alanine aminotransferase \> upper limit of normal \[ULN\], Aspartate aminotransferase \> ULN, Creatinine \> ULN, White blood cell count \< 3.5 x 10\^9/L, Hb \< lower limit of normal \[LLN\], Platelet count \<LLN).
6. Any positive result on Screening for serum hepatitis B surface antigen, hepatitis C antibody and human immunodeficiency virus.
7. Abnormal vital signs, any clinically important abnormalities in rhythm, conduction or morphology of the resting ECG and any clinically important abnormalities in the 12-Lead ECG as considered by the Investigator, that may interfere with the interpretation of QTc interval changes.
8. Known or suspected history of drug abuse, current smoker or those who have smoked or used nicotine products within the previous 3 months before the Screening Visit.
9. History of alcohol abuse and/or severe allergy/hypersensitivity.
10. Previous bone marrow transplant.
11. Males who are unwilling to use an acceptable method of birth control during the entire study period.