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An open study of pentoxifylline in the treatment of severe refractory rheumatoid arthritis
W P Maksymowych1, A Avina-Zubieta, M H Luong
1Department of Medicine, University of Alberta, Edmonton, Canada.
Objective:
Recent data implicates the cytokine, tumor necrosis factor alpha (TNF-alpha), in the pathophysiology of rheumatoid arthritis (RA). In vitro data suggest that pentoxifylline may possess anti-TNF-alpha properties. We have therefore carried out a prospective 3-month open evaluation of pentoxifylline in a group of adult patients with RA refractory to conventional disease remittive therapies.
Methods:
Nineteen patients with RA were included and clinical assessments were performed according to the World Health Organization/International League of Associations for Rheumatology (WHO/ILAR) criteria at baseline, and one and 3 months after the initiation of therapy. Laboratory assessments included a complete blood count, erythrocyte sedimentation rate (ESR), and whole blood assays of TNF-alpha production. TNF-alpha was assayed using ELISA and semiquantitative polymerase chain reaction methodologies.
Results:
A significant diminution in number of tender and swollen joints as well as the ESR was noted after 3 months (p < 0.05) although no consistent effects on TNF-alpha production were observed. Furthermore, whole blood assays of TNF-alpha production shortly after initiation of pentoxifylline therapy were not predictive of the clinical response to this agent.
Conclusion:
Although pentoxifylline may possess therapeutic properties in RA, any beneficial effects appear to be unrelated to changes in TNF-alpha generation in whole blood assays.