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NCT Number: NCT07535034

A Phase 2 Trial of Dotinurad in Xanthine Oxidase Inhibitor (XOI) Intolerant/Uricase Failure Gout Participants

The primary objective of this trial is to evaluate the efficacy of dotinurad in lowering serum uric acid (sUA) at Week 24 in participants with gout who are XOI intolerant or have failed uricase treatment.

Recruiting

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Key information

Age range

18 year–75 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Primary location

Amicis Research Center, Granada Hills, California, United States

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Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Between 18 and 75 years of age (inclusive) at the time of signing informed consent.
  • Diagnosis of gout based on 2015 American College of Rheumatology (ACR)-European Union League Against Rheumatism (EULAR) criteria for at least 1 year and has at least 1 of the following:
  • History (either by medical record or participant interview) of intolerance or a contraindication to either allopurinol or febuxostat.
  • Failed uricase treatment (eg, an sUA level >6.0 mg/dL at least 2 weeks after last infusion; intolerant or contraindicated to uricase treatment).
  • sUA level >6.0 and <10.5 mg/dL at both Screening Visit 1 (Day -28 Visit) and Screening Visit 2 (Day -7 Visit).
  • Female participants of childbearing potential must have a negative serum pregnancy test at Screening Visit 1 (Day -28 Visit), a negative urine pregnancy test on Day 1, and must not be breastfeeding.
  • Fertile male participants and female participants of childbearing potential must be willing to completely abstain from heterosexual sex or agree to use acceptable contraception from the time of signing informed consent through 30 days after the last dose of trial drug.

Exclusion criteria

  • History of or presence of kidney stones within 1 year prior to Screening.
  • History of or presence of malignancy in the last 5 years other than treated cutaneous basal or squamous cell carcinoma.
  • Known or suspected history of drug abuse, a positive drug test at Screening Visit 1, or a recent history of alcohol abuse.
  • Known history of or positive results for human immunodeficiency virus (HIV), Hepatitis B surface antigen (HBsAg), or Hepatitis C virus (HCV) during Screening.
  • Current or historical evidence of any clinically significant disease or condition that, in the opinion of the Investigator, may compromise participant safety or trial compliance or may confound interpretation of trial results.

Treatment and study plan

Dotinurad

Drug

Over-encapsulated tablets containing active drug substance administered orally.

Placebo

Other

Capsules containing microcrystalline cellulose administered orally.

Primary outcomes

  1. Percentage of Participants With an sUA Level <6.0 mg/dL at Week 24

    Time frame: Week 24

Secondary outcomes

  1. Percentage of Participants With an sUA Level <6.0 mg/dL at Weeks 16, 20 and 24

    Time frame: Weeks 16, 20 and 24

  2. Percentage of Participants With an sUA Level <6.0 <5.0, <4.0, and <3.0 mg/dL at Each Visit

    Time frame: Up to Week 40

  3. Mean Change From Baseline in sUA at Week 24

    Time frame: Baseline and Week 24

  4. Absolute Change from Baseline in sUA Levels at Each Visit

    Time frame: Baseline to Week 40

  5. Percent Change from Baseline in sUA Levels at Each Visit

    Time frame: Baseline to Week 40

  6. Number of Participants With Treatment-emergent Adverse Events (TEAEs) and Serious Adverse Events (SAEs) in Treatment Periods 1 and 2

    Time frame: Screening to Week 36

    Any clinically significant changes from baseline in safety laboratory values and vital signs will be reported as AEs per investigators discretion.

  7. Number of Participants With TEAEs and SAEs Throughout the Study

    Time frame: Screening to Week 40

    Any clinically significant changes from baseline in safety laboratory values and vital signs will be reported as AEs per investigators discretion.

Study contacts

Contact information is provided by the study sponsor or research team.

Clinical Trial Lead

CONTACT

[email protected]

1-858-379-2316

Sponsors and collaborators

Lead sponsor

Crystalys Therapeutics

Industry

Registry information

Official study title

A Phase 2, Randomized, Double-blind, Placebo-controlled, Multicenter Study to Evaluate the Efficacy and Safety of Dotinurad in Adult Participants With Gout Who Are Intolerant to Xanthine Oxidase Inhibitors or Failed Uricase Treatment

Important dates

Study start
2026
Primary completion
2027
Study completion
2027
First posted
Apr 16, 2026
Registry last updated
Jul 30, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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