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Spekhorst, Lotte S.; Bakker, Daphne; Drylewicz, Julia; Rispens, Theo; Loeff, Floris; Boesjes, Celeste M.; Thijs, Judith; Romeijn, Geertruida L. E.; Loman, Laura; Schuttelaar, Marie‐Louise; Wijk, Femke; Graaf, Marlies; Bruin‐Weller, Marjolein S.
Allergy, November 2022, 2022-11-00, 20221101, Volume: 77, Issue: 11Journal Article
Background At present, no real‐world studies are available on different dupilumab dosing regimens in controlled atopic dermatitis (AD). The aim of this study was to clinically evaluate a patient‐centered dupilumab dosing regimen in patients with controlled AD and to relate this to serum drug levels and serum biomarkers. Methods Ninety adult AD patients from the prospective BioDay registry were included based on their dupilumab administration interval according to a predefined patient‐centered dosing regimen. Group A (n = 30) did not fulfill the criteria for interval prolongation and continued using the standard dupilumab dosage (300 mg/2 weeks), group B (n = 30) prolonged dupilumab interval with 50% (300 mg/4 weeks), and group C (n = 30) prolonged dupilumab interval with 66%–75% (300 mg/6–8 weeks). AD severity score, patient‐reported outcomes, serum dupilumab levels, and serum biomarkers were analyzed over time. Results Disease severity scores did not significantly change over time during the tapering period in any of the groups. In groups B and C, the Numeric Rating Scale (NRS)‐pruritus temporarily significantly increased after interval prolongation but remained low (median NRS‐pruritus≤4). Median dupilumab levels remained stable in group A (standard dosage), but significantly decreased in groups B and C (24.1 mg/L (IQR = 17.1–45.6); 12.5 mg/L (IQR = 1.7–22.3)) compared with the levels during the standard dosage (88.2 mg/L IQR = 67.1–123.0, p < .001). Disease severity biomarker levels (CCL17/CCL18) remained low in all study groups during the whole observation period. Conclusions This study showed that dose reduction was successful in a subgroup of patients with controlled AD by using a patient‐centered dosing regimen. These patients showed stable low disease activity and low severity biomarkers over time. Dose reduction was successful in a subgroup of controlled AD patients by using a patient‐centered dupilumab dosing regimen. Despite significantly lower dupilumab levels, the EASI‐score and disease severity biomarkers (TARC/CCL17 and PARC/CCL18) in groups B (Q4W) and C (Q6W/Q8W) remained low and stable. These findings are the first step toward personalized dupilumab treatment for controlled AD patients in clinical practice.Abbreviations: AD, atopic dermatitis; EASI, eczema area and severity index; PARC (CCL18), pulmonary and activation‐regulated chemokine; PROMs, patient‐reported outcome measures; Q2W, every two weeks; Q4W, every four weeks; Q6W, every six weeks; Q8W, every eight weeks; TARC (CCL17), thymus and activation‐regulated chemokine
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