Article Text

FRI0189 A preliminary algorithm introducing immunogenicity assessment in the management of ra patients receiving biotechnological therapies
  1. S. Garcês1,2,
  2. M. Antunes3,
  3. E. Benito-Garcia4,
  4. J. Canas-Silva1,
  5. L. Aarden5,
  6. J. Demengeot2
  1. 1Rheumatology, Hospital Garcia De Orta, Almada
  2. 2Immunology, Instituto Gulbenkian Ciência, Oeiras
  3. 3Statistics, Lisbon University, Lisbon
  4. 4Epidemiology, BioEpi, Oeiras, Portugal
  5. 5Immunology, Sanquin Research Institute, Amsterdam, Netherlands


Background Clinical remission is today the treatment goal for Rheumatoid Arthritis (RA), which requires fast and assertive therapeutic decisions for a tight control of disease activity. Few objective parameters are available to guide clinical decisions, namely in switcher patients. We designed a preliminary algorithm introducing immunogenicity assessment in the current approach to RA patients receiving biotechnologic therapies.

Objectives To evaluate the concordance between the new algorithm and current clinical practice, comparing the effectiveness of “immunogenicity-based” versus “empirical-based” switches in a cohort of patients with established RA receiving biologics.

Methods EULAR therapeutic response was evaluated in 105 RA patients (naive or switchers) over one year, through GEE analysis. Serum drug trough levels were assessed by ELISA and anti-drug antibodies (ADA) by Bridging ELISA.

Results During follow-up, 48.6% of patients (Group A) had concordant therapeutic decisions. One year after the therapeutic decision, patients from Group A had a higher probability of achieving response (OR=7.91, p<0.001, 95%CI=3.27-19.13) and low disease activity (OR=9.77, p<0.001, 95%CI=4.69-20.37).

Conclusions Immunogenicity assessment might help to optimize therapeutic decisions, leading to a better control of disease activity with significant better clinical outcomes in RA patients receiving biotechnologic therapies.

Disclosure of Interest None Declared

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