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Welzel T, Golhen K, Atkinson A, Gotta V, Ternant D, Kuemmerle-Deschner JB, Michler C, Koch G, van den Anker JN, Pfister M, Woerner A. Prospective study to characterize adalimumab exposure in pediatric patients with rheumatic diseases. Pediatr Rheumatol Online J 2024; 22:5. [PMID: 38167019 PMCID: PMC10763375 DOI: 10.1186/s12969-023-00930-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 11/15/2023] [Indexed: 01/05/2024] Open
Abstract
BACKGROUND In pediatric rheumatic diseases (PRD), adalimumab is dosed using fixed weight-based bands irrespective of methotrexate co-treatment, disease activity (DA) or other factors that might influence adalimumab pharmacokinetics (PK). In rheumatoid arthritis (RA) adalimumab exposure between 2-8 mg/L is associated with clinical response. PRD data on adalimumab is scarce. Therefore, this study aimed to analyze adalimumab PK and its variability in PRD treated with/without methotrexate. METHODS A two-center prospective study in PRD patients aged 2-18 years treated with adalimumab and methotrexate (GA-M) or adalimumab alone (GA) for ≥ 12 weeks was performed. Adalimumab concentrations were collected 1-9 (maximum concentration; Cmax), and 10-14 days (minimum concentration; Cmin) during ≥ 12 weeks following adalimumab start. Concentrations were analyzed with enzyme-linked immunosorbent assay (lower limit of quantification: 0.5 mg/L). Log-normalized Cmin were compared between GA-M and GA using a standard t-test. RESULTS Twenty-eight patients (14 per group), diagnosed with juvenile idiopathic arthritis (71.4%), non-infectious uveitis (25%) or chronic recurrent multifocal osteomyelitis (3.6%) completed the study. GA-M included more females (71.4%; GA 35.7%, p = 0.13). At first study visit, children in GA-M had a slightly longer exposure to adalimumab (17.8 months [IQR 9.6, 21.6]) compared to GA (15.8 months [IQR 8.5, 30.8], p = 0.8). Adalimumab dosing was similar between both groups (median dose 40 mg every 14 days) and observed DA was low. Children in GA-M had a 27% higher median overall exposure compared to GA, although median Cmin adalimumab values were statistically not different (p = 0.3). Cmin values ≥ 8 mg/L (upper limit RA) were more frequently observed in GA-M versus GA (79% versus 64%). Overall, a wide range of Cmin values was observed in PRD (0.5 to 26 mg/L). CONCLUSION This study revealed a high heterogeneity in adalimumab exposure in PRD. Adalimumab exposure tended to be higher with methotrexate co-treatment compared to adalimumab monotherapy although differences were not statistically significant. Most children showed adalimumab exposure exceeding those reported for RA with clinical response, particularly with methotrexate co-treatment. This highlights the need of further investigations to establish model-based personalized treatment strategies in PRD to avoid under- and overexposure. TRIAL REGISTRATION NCT04042792 , registered 02.08.2019.
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Affiliation(s)
- Tatjana Welzel
- Pediatric Pharmacology and Pharmacometrics, University Children's Hospital Basel, University of Basel, Basel, Switzerland.
- Division of Pediatric Rheumatology, Department of Pediatrics and Autoinflammation Reference Centre Tuebingen (arcT), University Hospital Tuebingen, Tuebingen, Germany.
- Pediatric Rheumatology, University Children's Hospital Basel, University of Basel, Basel, Switzerland.
- Pediatric Research Center, University Children's Hospital Basel, University of Basel, Basel, Switzerland.
| | - Klervi Golhen
- Pediatric Pharmacology and Pharmacometrics, University Children's Hospital Basel, University of Basel, Basel, Switzerland
| | - Andrew Atkinson
- Pediatric Pharmacology and Pharmacometrics, University Children's Hospital Basel, University of Basel, Basel, Switzerland
- Pediatric Research Center, University Children's Hospital Basel, University of Basel, Basel, Switzerland
- Division of Infectious Diseases, Washington University School of Medicine in St. Louis, St. Louis, MO, USA
| | - Verena Gotta
- Pediatric Pharmacology and Pharmacometrics, University Children's Hospital Basel, University of Basel, Basel, Switzerland
| | - David Ternant
- Pediatric Pharmacology and Pharmacometrics, University Children's Hospital Basel, University of Basel, Basel, Switzerland
- Université de Tours, service de pharmacologie médicale, Tours France, Université de Tours, EA 4245 T2I, Tours, France
| | - Jasmin B Kuemmerle-Deschner
- Division of Pediatric Rheumatology, Department of Pediatrics and Autoinflammation Reference Centre Tuebingen (arcT), University Hospital Tuebingen, Tuebingen, Germany
| | - Christine Michler
- Division of Pediatric Rheumatology, Department of Pediatrics and Autoinflammation Reference Centre Tuebingen (arcT), University Hospital Tuebingen, Tuebingen, Germany
| | - Gilbert Koch
- Pediatric Pharmacology and Pharmacometrics, University Children's Hospital Basel, University of Basel, Basel, Switzerland
| | - Johannes N van den Anker
- Pediatric Pharmacology and Pharmacometrics, University Children's Hospital Basel, University of Basel, Basel, Switzerland
| | - Marc Pfister
- Pediatric Pharmacology and Pharmacometrics, University Children's Hospital Basel, University of Basel, Basel, Switzerland
| | - Andreas Woerner
- Pediatric Rheumatology, University Children's Hospital Basel, University of Basel, Basel, Switzerland
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