Rheumatology, Vol 38, 362-369, Copyright © 1999 by British Society for Rheumatology
PP Tak, BA 't Hart, MC Kraan, M Jonker, TJ Smeets and FC Breedveld
OBJECTIVE: To determine whether interferon beta (IFN-beta) therapy might
have a beneficial effect on arthritis, we evaluated the effect of IFN-beta
on collagen type II-induced arthritis (CIA) in rhesus monkeys and conducted
a pilot study in patients with rheumatoid arthritis (RA). METHODS: Four
rhesus monkeys with CIA were treated with 10 x 10(6) U (MIU)/kg mammalian
cell-derived recombinant IFN-beta (Rebif; Ares- Serono) s.c. daily for 1
week. Subsequently, 12 patients with active RA were treated for 12 weeks
with purified natural fibroblast IFN-beta (Frone, Ares-Serono) s.c. 3 times
weekly at the following dosages: 6 MIU (n = 4), 12 MIU (n = 4) and 18 MIU
(n = 4). RESULTS: Rapid clinical improvement during IFN-beta therapy was
observed in three of the four rhesus monkeys with CIA. There was also a
marked decrease in serum C- reactive protein (CRP) levels with a subsequent
increase after discontinuation of the treatment in all monkeys. The 10 RA
patients who completed the study exhibited on average gradual improvement
of tender and swollen joint counts, patient's assessment of pain, and
patient's and doctor's global assessment (all P < 0.05). The health
assessment questionnaire and serum CRP levels also tended to decrease, but
this was not statistically significant; 40% of the patients fulfilled the
ACR criteria for 20%, improvement, whereas none fulfilled the ACR criteria
for 50% improvement 12 weeks after initiation of treatment. There was no
clear dose response relationship. CONCLUSION: The data suggest that
IFN-beta treatment has a beneficial effect on arthritis.
ORIGINAL PAPERS
The effects of interferon beta treatment on arthritis
Department of Rheumatology, Leiden University Medical Centre, The Netherlands.
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