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Immunogenicity of adalimumab could impair important treatment outcome parameters in patients with rheumatoid arthritis (RA). Patients who developed antiadalimumab antibodies (AAA) during a 3 year time period achieved less often minimal disease activity or remission and treatment failure occurred more often compared with patients without AAA.1 There were remarkable baseline differences: patients developing AAA had more long-standing, severe disease and less often used concomitant medication including lower doses of methotrexate (MTX), compared with patients not developing AAA. In literature, a favourable effect of concomitant MTX use on the immunogenicity of adalimumab for several inflammatory conditions is suggested.2
To investigate which MTX dose is sufficient to reduce immunogenicity, patients of …
Funding Funding was provided by Abbott Laboratories and Pfizer. Abbott Laboratories and Pfizer had no involvement in the study design; in the collection, analysis and interpretation of data; in the writing of the manuscript; or in the decision to submit the manuscript for publication. In addition, this investigation was also facilitated by the Division of Research & Education of the Jan van Breemen Research Institute | Reade.
Competing interests CLK declares no competing interest. MTN has received consultancy fees from Abbott, Roche, Pfizer, Merk Sharp and Dohme (MSD), Union chimique belge (UCB), Swedisch orphan biovitrum (sobi) Bristol-Myers Squibb (BMS), payment for lectures from Abbott, Roche and Pfizer. GJW has received a research grant from Pfizer (Wyeth) (paid to the Institution) and payments for lectures from Pfizer and Amgen.
Ethics approval The study was approved by the medical ethics committee of Reade and Slotervaart Ziekenhuis.
Provenance and peer review Not commissioned; externally peer reviewed.
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