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In his letter,1 Tan questions the use of Crohn's Disease Activity Index (CDAI) as a clinical outcome measure in our randomised controlled trial (RCT) of how to optimally handle Crohn's disease patients with symptomatic infliximab (IFX) treatment failure during ongoing IFX maintenance therapy.2 This study is hitherto the only published RCT of personalised antitumour necrosis factor-alpha (anti-TNFα) therapy where measurements of serum trough levels of drug and anti-drug antibodies (Abs) have been used to prospectively guide interventions according to proposed underlying immune-pharmacological basis for treatment failure. The study builds on our original hypothesis, which operates with IFX treatment failure caused by (1) drug immunogenicity with blockade of drug-mediated TNF-neutralisation by anti-IFX Abs and/or anti-IFX Ab-mediated increased drug clearance; (2) non-immune-mediated pharmacokinetic issues with low circulating IFX trough levels without anti-IFX Abs; or (3) in case of high circulating TNF-neutralising capacity pharmacodynamic …
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