Evaluation of Low Dose Infliximab in Ankylosing Spondylitis (Study P04352)

Infliximab 3 mg/kg infusions at Weeks 0, 2, and 6 and every 8 weeks thereafter. Subjects who lose response according to a pre-specified criteria at weeks 22 or 38 visit will increase the dose of infliximab to 5 mg/kg (rounded up to the nearest vial).

Placebo infusions at Weeks 0, 2, and 6. Subjects will be evaluated at Week 12 after which they will receive infliximab 3 mg/kg at Weeks 16, 18, and 22 then every 8 weeks. Subjects who lose response according to a pre-specified criteria at weeks 22 or 38 visit will increase the dose of infliximab to 5 mg/kg (rounded up to the nearest vial).