Single and Multiple Dose Study in Japanese Subjects

While clinical studies of RDEA3170 to date have been limited to a Western population, it is
recognized that both intrinsic and extrinsic factors may impact the PK, PD, safety, and dose
response in different ethnic populations. The purpose of this study is to explore the
safety, tolerability, pharmacokinetic (PK), and pharmacodynamic (PD) of single and multiple
doses of RDEA3170 in healthy Japanese males, and to allow comparison of these parameters
with the Western population.

Inclusion Criteria:

- Able to understand the study procedures and the risks involved, and willing to
provide written informed consent before the first study related activity.

- Healthy adult male subject born in Japan.

- Subject has parents and grandparents who are Japanese.

- Subject is in possession of a valid Japanese passport.

- All laboratory parameters should be within normal limits or considered not clinically
significant by the investigator.

- Screening serum urate level ≥ 4.5 mg/dL.

- Subject is free of any clinically significant disease that requires a physician's
care and/or would interfere with study evaluations or procedures.

- Subject has a normal or clinically acceptable physical examination.

- Subject has no clinically relevant abnormalities in blood pressure, heart rate, and
body temperature, per the Investigator's judgment.

Exclusion Criteria:

- Positive serology to human immunodeficiency virus (HIV-1 or HIV-2).

- Positive test for active hepatitis B or hepatitis C infection.

- History or suspicion of kidney stones.

- Undergone major surgery within 3 months prior to Day 1.

- Exposed to an investigational drug (or a medical device) within 30 days or 5
half-lives of the investigational drug (whichever is longer) prior to Day 1 or is
currently participating in another study of an investigational drug (or medical
device).

- Prior exposure to RDEA3170.