Study of Pegloticase in Participants With Uncontrolled Gout Who Have Had a Kidney Transplant

Phase 4

Completed

Conditions: Uncontrolled Gout
Kidney Transplant

Interventions: Biological: Pegloticase

Registration Number: NCT04087720

Lead Sponsor: Amgen

Brief Summary: The primary objective of this study is to evaluate the effect of pegloticase on the response rate of sustained serum uric acid (sUA) reduction to sUA \< 6 mg/dL during Month 6 of treatment.

Detailed Description: The study design includes: 1) a Screening Period, lasting up to 35 days; 2) a 24-week treatment period which includes an End-of-Study (Week 24) /Early Termination Visit; 3) a safety follow-up phone/email Visit 30 days after the last infusion; and 4) a 3 month post-treatment follow up visit.

Study acquired from Horizon in 2024.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 20

Inclusion Criteria

Willing and able to give informed consent;
Willing and able to comply with the prescribed treatment protocol and evaluations for the duration of the study;
Adult men or women ≥ 18 years of age;
Is a recipient of a de novo kidney from a living or deceased donor and is >1 year post transplant prior to screening;
Is on a stable standard of care immunosuppression therapy for at least 3 months prior to screening;
Kidney allograft is functional at entry, based on an estimated glomerular filtration rate (eGFR) ≥ 15 mL/min/1.73m²;
Women of childbearing potential have a negative screening serum pregnancy test and will be required to use a medically approved form of birth control during their participation in the study;
Uncontrolled gout, defined as:
1. Hyperuricemia during screening as documented by sUA ≥ 7 mg/dL during Screening and prior to entry into the Treatment Period (Note: the sUA may be repeated up to 3 times during the Screening Period to confirm eligibility), and
2. Inability to maintain sUA <6 mg/dL on other urate-lowering therapy or intolerable side effects or contraindicated with conventional urate-lowering therapy, and
3. At least 1 of the following:
i. Evidence of tophaceous deposits; ii. Recurrent gout flares defined as 2 or more flares in the 12 months prior to Screening; iii. Presence of chronic gouty arthritis;
Able to tolerate low-dose prednisone (< 10 mg/day) as part of the required standard gout flare prophylaxis regimen for ≥ 1 week before the first infusion.

Exclusion Criteria

Any other organ transplant beside kidney;
Any severe infection, unless treated and completely resolved at least 2 weeks prior to Day 1;
Chronic or active hepatitis B virus infection;
Known history of hepatitis C virus ribonucleic acid (RNA) positivity unless treated and viral load is negative;
Known history of human immunodeficiency virus (HIV) positivity;
Glucose-6-phosphate dehydrogenase (G6PD) deficiency (tested at the Screening Visit);
Decompensated congestive heart failure or hospitalization for congestive heart failure within 3 months of the Screening Visit, uncontrolled arrhythmia, treatment for acute coronary syndrome (myocardial infarction or unstable angina), or uncontrolled blood pressure (> 160/100 mm Hg) at the end of the Screening Period (Day 1 prior to infusion);
Pregnant, planning to become pregnant, breastfeeding, planning to impregnate female partner, or not using an effective form of birth control, as determined by the Investigator;
Prior treatment with pegloticase, another recombinant uricase (rasburicase), or concomitant therapy with a polyethylene glycol-conjugated drug;
Known allergy to pegylated products or history of anaphylactic reaction to a recombinant protein or porcine product;
Receipt of an investigational drug within 4 weeks or 5 half-lives, whichever is longer, prior to Day 1, or plans to take an investigational drug during the study;
Currently receiving systemic or radiologic treatment for ongoing cancer;
History of malignancy within 5 years other than non-melanoma skin cancer, in situ carcinoma of cervix, early stage renal cell cancer or early stage prostate cancer that has been completely resected > 2 years prior to screening;
Uncontrolled hyperglycemia with a plasma glucose value > 240 mg/dL at Screening that is not subsequently controlled by the end of the Screening Period;
Diagnosis of osteomyelitis;
Known history of hypoxanthine-guanine phosphoribosyl-transferase deficiency, such as Lesch-Nyhan and Kelley-Seegmiller syndrome;
Unsuitable candidate for the study, based on the opinion of the Investigator (e.g., cognitive impairment), such that participation might create undue risk to the subject or interfere with the subject's ability to comply with the protocol requirements or complete the study;
Currently receiving allopurinol, febuxostat or other urate lowering medications and unable to discontinue medication 7 days prior to Day 1; or
Currently receiving probenecid and unable to discontinue medication within 3 days, prior to Day 1.

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Pegloticase	Pegloticase	Participants receive 8 mg pegloticase every 2 weeks from Day 1 through Week 22

Primary Outcome Measures

Name	Time	Method
Percentage of Serum Uric Acid (sUA) < 6 mg/dL Responders During Month 6	Month 6 (Weeks 20, 21, 22, 23, 24)	sUA \< 6 mg/dL responders are defined as participants achieving and maintaining sUA \< 6 mg/dL for at least 80% of the time during Month 6, which includes pre-infusion and post-infusion results at Week 20, results at Week 21, pre-infusion and post-infusion results at Week 22, results at Week 23, results at Week 24, and unscheduled assessments of sUA collected between Week 20 and Week 24. Two-sided Exact Clopper-Pearson confidence interval is used for the calculation of the 95% confidence interval.

Secondary Outcome Measures

Name	Time	Method
Percentage of sUA < 5 mg/dL Responders During Month 6	Month 6 (Weeks 20, 21, 22, 23, and 24)	sUA \< 5 mg/dL responders are defined as participants achieving and maintaining sUA \<5 mg/dL for at least 80% of the time during Month 6, which includes pre-infusion and post-infusion results at Week 20, results at Week 21, pre-infusion and post-infusion results at Week 22, results at Week 23, results at Week 24, and unscheduled assessments of sUA collected between Week 20 and Week 24. Two-sided Exact Clopper-Pearson confidence interval is used for the calculation of the 95% confidence interval.
Change From Baseline in Heath Assessment Questionnaire - Disability Index (HAQ-DI) Score Through Week 24	Baseline, Weeks 6, 14, 20, 24	The HAQ-DI is a self-reported assessment of how a participant's illness affects their ability to function in their daily life over the past week. The HAQ-DI for a participant is calculated as the mean of the following 8 category scores: Dressing and Grooming, Arising, Eating, Walking, Hygiene, Reach, Grip, and Activities. The HAQ-DI ranges from 0 to 3 with higher values indicating higher disability. Baseline is defined as the last measurement taken prior to the first infusion of pegloticase. The 95% confidence interval is a two-sided normal theory-based 95% confidence interval.
Change From Baseline in Health Assessment Questionnaire (HAQ) Pain Visual Analog Scale (VAS) Score Through Week 24	Baseline, Weeks 6, 14, 20, 24	The HAQ-Pain score consists of a doubly anchored, horizontal VAS 15 cm in length, and rates a participant's pain over the past week from 0 to 100 with 0 = no pain and 100 = severe pain. Baseline is defined as the last measurement taken prior to the first infusion of pegloticase. The 95% confidence interval is a two-sided normal theory-based 95% confidence interval.

Trial Locations

Locations (8): Nephrology Consultants
🇺🇸
Huntsville, Alabama, United States
Amicis Research Center
🇺🇸
Northridge, California, United States
Coastal Medical Research
🇺🇸
Brunswick, Georgia, United States
University of Alabama Birmingham
🇺🇸
Birmingham, Alabama, United States
Keck School of Medicine of USC
🇺🇸
Los Angeles, California, United States
Duke University Medical Center
🇺🇸
Durham, North Carolina, United States
Genesis Clinical Research
🇺🇸
Tampa, Florida, United States
Clear Lake Specialties
🇺🇸
Webster, Texas, United States