Combination Treatment Study in Subjects With Tophaceous Gout With Lesinurad and Febuxostat (CRYSTAL)

This is an interventional treatment trial for Tophaceous Gout Read More

Inclusion Criteria:

• Subject is able to understand the study procedures, the risks involved and willing to provide written informed consent before the first study related activity.
• Subject is willing to adhere to the visit/protocol schedules.
• Subject meets the diagnosis of gout as per the American Rheumatism Association
• Criteria for the Classification of Acute Arthritis of Primary Gout.
• Subject meets one of the following criteria:
• Subjects who are not currently taking an approved ULT must have an sUA value of ≥ 8 mg/dL (476 µmol/L).
• Subjects entering the study on a medically appropriate dose of febuxostat or allopurinol must have an sUA value of ≥ 6.0 mg/dL (357 µmol/L).
• Subject must be able to take gout flare prophylaxis with colchicine or non-steroidal anti-inflammatory drug (NSAID) (including Cox-2 selective NSAID) ± PPI.
• Subject with at least 1 measurable tophus on the hands/wrists and/or feet/ankles ≥ 5 mm and ≤ 20 mm in the longest diameter.
• Body mass index (BMI) < 45 kg/m2

Exclusion Criteria:

• Subject with known hypersensitivity or allergy to febuxostat.
• Subject who is taking any approved urate-lowering medication other than allopurinol or febuxostat that is indicated for the treatment of gout within 8 weeks of the Screening Visit.
• Subject who previously received pegloticase.
• Subject who consumes more than 14 drinks of alcohol per week (eg, 1 drink = 5 oz [150 mL] of wine, 12 oz [360 mL] of beer, or 1.5 oz [45 mL] of hard liquor).
• Subject with a history or suspicion of drug abuse within the past 5 years.
• Subject with a history of myositis/myopathy or rhabdomyolysis.
• Subject that requires or may require systemic immunosuppressive or immunomodulatory treatment.
• Subject with known or suspected human immunodeficiency virus (HIV) infection.
• Subject with a positive test for active hepatitis B or hepatitis C infection.
• Subject with a history of malignancy within the previous 5 years with the exception of non-melanoma skin cancer that has been treated with no evidence of recurrence, treated cervical dysplasia or treated in situ Grade 1 cervical cancer.
• Subject within the last 12 months with: unstable angina, New York Heart Association thrombosis; or subjects currently receiving anticoagulants.
• Subject with uncontrolled hypertension.
• Subject with an estimated creatinine clearance < 30 mL/min.
• Subjects with a creatine kinase > 2.5 x ULN at any time during the Screening Period.
• Subject with active peptic ulcer disease requiring treatment.
• Subject with a history of xanthinuria, active liver disease, or hepatic dysfunction.
• Subject receiving chronic treatment with more than 325 mg of salicylates per day.
• Subject taking valpromide, progabide, or valproic acid.
• Subject who has received an investigational therapy within 8 weeks or 5 half-lives (whichever is longer) prior to the Screening Visit.
• Subject with any other medical or psychological condition, which in the opinion of the Investigator and/or Medical Monitor, might create undue risk to the subject or interfere with the subject's ability to comply with the protocol requirements, or to complete the study.