SAT0507 CLINICAL CHARACTERISTICS AND TREATMENT RESPONSE IN JUVENILE GOUT PATIENTS: A SINGLE CENTER EXPERIENCE
Authors: S. Zheng, P. Y. Lee, Y. Huang, Q. Huang, S. Chen, T. W. Li
Journal: Annals of the Rheumatic Diseases (2020)

Background: The incidence of juvenile gout is increasing in China. The clinical manifestations of juvenile gout and treatment strategies to reduce uric acid levels in children are not well described due to the limited number of cases in the past. Objectives: We aim to describe the clinical characteristic of children with gout and study the treatment response to febuxostat. Methods: These studies were approved by the Institutional Review Board of Guangdong Second provincial General Hospital. We performed a retrospective analysis on 98 juvenile gout patients (age ≤ 18 years) evaluated in our hospital from Jan 2016 to Dec 2019. We analyzed clinical parameters, laboratory data and treatment response. Results: The average age of disease onset in children with gout was 15.2 ± 2.0 years and the youngest patient was 9 years old. The majority of patients were male (94/98) and mean serum uric acid (sUA) level were 705.8 ± 145.7 μmol/L (reference range &lt;420 μmol/L). More than half of the cohort had normal body mass index (mean 24.7 ± 4.7 kg/m 2 ; range 14.9 to 36.1 kg/m 2 ). Renal function was generally normal in these children (serum creatinine 96.9 ± 17.8 μmol/L). In terms of joint manifestations, juvenile gout preferentially affected finger joints (29%), ankles (28%) and metatarsal joints (MTP; 20%). The most frequent sites of initial gout attack were ankles (45%), MTP (39%) and fingers (6%). In addition, tophi can occur in pediatric patients and typically develop in the finger joints (54%). Tophi was observed in about 25% of juvenile gout patients, typically within the first two years of disease onset (mean duration 1.7 ± 0. 9 years). We have found tophi in children as young as 10 years of age. For treatment for chronic hyperuricemia, 32 patients (32.7%) were started on febuxostat and 5 patients (5.1%) received allopurinol. A decrease in sUA was observed in both groups after the first month of treatment (febuxostat: baseline 690.4 ± 99.7 μmol/L to 482.7 ± 140.8 μmol/L vs. allopurinol: baseline 728.8 ±112.8 μmol/L to 565.0 ± 116.7 μmol/L, P=0.477). Serum uric acid of 6 patients in the febuxostat group (none in the allopurinol group) dropped below 360 μmol/L. There were no statistical differences in Cr, AST and ALT between the groups. During follow-up after 3 months, further decline in sUA level were observed in patients treated with febuxostat (409.5 ± 83.4, compared with baseline P&lt;0.001). Conclusion: Juvenile gout has a different pattern of joint involvement and is less associated with elevated BMI compared to gout in adults. We show that febuxostat is effective in reducing uric acid levels in juvenile gout. These findings will help clinicians better understand the clinical manifestations and treatment response in juvenile gout. Figure 1 Compared treatment response with allopurinol and febuxostat References: [1]Kishimoto K, Kobayashi R, Hori D, et al. Febuxostat as a Prophylaxis for Tumor Lysis Syndrome in Children with Hematological Malignancies. Anticancer Res. 2017 Oct;37(10):5845-5849. [2]Lu, C.C., et al. Clinical characteristics of and relationship between metabolic components and renal function among patients with early-onset juvenile tophaceous gout. J Rheumatol, 2014. 41(9): p. 1878-83. Disclosure of Interests: None declared