Abstract
Anti-TNFalpha treatment seems to be highly effective in AS. The results available indicate that this treatment is at least as effective as in RA. Furthermore, because no other treatments are available for AS--in contrast with RA or psoriatic arthritis--infliximab may even become a first line immunosuppressive treatment in patients with severe active AS. A dose of 5 mg/kg body weight seems to be required and intervals between 6 and 12 weeks seem to be necessary depending on the disease activity. It remains to be seen what the long term effects will be, whether the patients benefit from long term treatment, and whether radiological progression and ankylosis can be stopped. Allergy, lupus-like diseases, and tuberculosis are rare side effects which need to be considered. At first glance, the possible benefits of anti-TNFalpha treatment seem to outweigh these shortcomings, including the high cost.