Tigulixostat, Phase 3 Study, Allopurinol Controlled in Gout Patients

Inclusion Criteria:

• Male or female subjects between the ages of 18 85 years, inclusive.

• Subjects with hyperuricemia and a history or presence of gout per American Collegeof Rheumatology/European League Against Rheumatism (ACR/EULAR) 2015 criteria.

• Subjects who are currently on urate-lowering therapies (ULT) with an sUA level ≥6.0mg/dL at screening (Visit 1); or subjects who are currently not on ULT with an sUAlevel ≥7.0 mg/dL at screening (Visit 1). Subjects currently on ULT will undergowashout and must have an sUA level ≥7.0 mg/dL at Visit 3 to be randomized andparticipate in the study.

• Subjects with a Body Mass Index ≤50 kg/m2 and estimated glomerular filtration rate (eGFR) ≥30 mL/min/1.73 m2 at screening (Visit 1).

Exclusion Criteria:

• Subjects with secondary hyperuricemia and enzymatic defects.

• Subjects experiencing an acute gout attack (intense pain, swelling, or/andtenderness in the joint area) within 2 weeks prior to screening (Visit 1).

• Subjects who have received pegloticase to treat gout which has not responded to theusual treatments.

• Subjects who have not been receiving stable doses of drugs known to affect sUAlevels for the last 3 weeks prior to screening (Visit 1).

• Subjects with a history of xanthinuria (elevated levels of xanthine in the urine).