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Correspondence response
Response to: ‘Drug survival on TNF inhibitors: 2003–2004 data from Italian National Register (GISEA Register)’ by Iannone et al
  1. Martin Neovius,
  2. Johan Askling
  1. Karolinska Institutet, Clinical Epidemiology Unit (T2), Stockholm, Sweden
  1. Correspondence to Dr Martin Neovius, Karolinska Institutet, Clinical Epidemiology Unit (T2), Stockholm 17176, Sweden; martin.neovius{at}

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We thank Iannone et al for their comment1 on our recent study on drug survival on etanercept, infliximab and adalimumab in patients with rheumatoid arthritis (RA).2 They noted similarities between our findings and their previously published data3 on 853 Italian patients starting tumour necrosis factor (TNF) inhibitor treatment in 2003–2004 in terms of best drug survival on etanercept, similar 4- versus 5-year drug survival for etanercept and infliximab, and some shared findings regarding predictors. We agree that there are several similarities, but also differences. We also apologise for not including their study in our non-exhaustive review in the appendix, and not citing their study together with the study by Kievit et al.4

Specifically, we …

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