RT Journal Article
SR Electronic
T1 Prevalence of TNF-α Blocker Immunogenicity in Psoriatic Arthritis
JF The Journal of Rheumatology
JO J Rheumatol
FD The Journal of Rheumatology
SP 73
OP 78
DO 10.3899/jrheum.140685
VO 42
IS 1
A1 Michael Zisapel
A1 Devy Zisman
A1 Noa Madar-Balakirski
A1 Uri Arad
A1 Hagit Padova
A1 Hagit Matz
A1 Hagit Maman-Sarvagyl
A1 Ilana Kaufman
A1 Daphna Paran
A1 Joy Feld
A1 Ira Litinsky
A1 Irena Wigler
A1 Dan Caspi
A1 Ori Elkayam
YR 2015
UL http://www.jrheum.org/content/42/1/73.abstract
AB Objective. The longterm use of tumor necrosis factor (TNF)-α blockers is limited by the formation of neutralizing antibodies. To the best of our knowledge, immunogenicity in psoriatic arthritis (PsA) has not been investigated in depth. Our objective was to evaluate the prevalence and significance of TNF-α blocker immunogenicity in PsA. Methods. Consecutive patients with PsA treated with either infliximab (IFX), adalimumab (ADA), or etanercept (ETN) > 3 months participated in our cross-sectional study. Their demographic and clinical characteristics, skin and joint disease activity, and records of use of methotrexate (MTX) and other medications were collected. Drug levels (ELISA) and antidrug antibodies (ADAb; Bridging ELISA) were evaluated before the next injection or infusion. Results. A total of 93 patients with PsA were recruited (48 receiving ADA, 24 IFX, and 21 ETN), with a mean age of 53 years (range 21–83 yrs), composed of 53% women. One-fourth of the patients were concomitantly treated with MTX. Altogether, 77% of the patients demonstrated therapeutic drug levels. High levels of ADAb were found in 29% of patients taking ADA, 21% taking IFX, and 0% taking ETN. ADAb significantly correlated with lower drug levels, higher 28-joint Disease Activity Scores, and higher global assessments. MTX use correlated significantly with a lower prevalence of ADAb. Conclusion. Significant levels of ADAb were present in up to 29% of patients with PsA treated with ADA or IFX. ADAb clearly correlated with low therapeutic drug levels and higher disease activity variables. The use of MTX significantly decreased ADAb prevalence, and its use should be strongly considered in combination with TNF-α blocker antibodies in patients with PsA.