Abstract

Background: Tumor necrosis factor-α is present in arteries in giant cell arteritis. Objective: To evaluate the efficacy of infliximab, an anti–tumor necrosis factor-α agent, in giant cell arteritis. Design: Randomized, controlled trial. Setting: 22 sites in the United States, the United Kingdom, Belgium, Italy, and Spain. Patients: 44 patients with newly diagnosed giant cell arteritis that was in glucocorticosteroid-induced remission. Intervention: Participants were randomly assigned in a 2:1 ratio to receive infliximab (5 mg/kg of body weight) or placebo. Sixteen patients were assigned to glucocorticosteroid plus placebo, and 28 patients to glucocorticosteroid plus infliximab. Measurements: End points were measured through week 22, when an interim analysis resulted in early stopping of the planned 54-week trial. Primary end points were the number of patients who remained free of relapse through week 22 and adverse events. Secondary end points were time to first relapse, biomarkers, cumulative glucocorticosteroid dose, and the number of patients who remained relapse-free while the glucocorticosteroid dosage was tapered to 10 mg/d. Results: Infliximab therapy did not increase the proportion of patients without relapse at week 22 compared with placebo (43% vs. 50%, respectively; difference, −7 percentage points [95% CI, −38 to 23 percentage points; P = 0.65), nor did it increase the proportion of patients whose glucocorticosteroid dosages were tapered to 10 mg/d without relapse (61% vs. 75%, respectively; difference, −14 percentage points [CI, −42 to 14 percentage points]; P = 0.31). The incidence of infection was 71% with infliximab and 56% with placebo (difference, 15 percentage points [CI, −14 to 45 percentage points]). Limitations: The sample was too small to rule out modest effects of infliximab and included only patients with a new diagnosis. Only one dose of infliximab was evaluated, and the study was terminated early. Conclusions: This trial is too small to draw definitive conclusions, but it provides evidence that using infliximab as maintenance therapy in patients in glucocorticoid-induced remission of newly diagnosed giant cell arteritis is of no benefit and may be harmful. If infliximab has benefit, it is unlikely to be great. *For a list of the members of the Infliximab-GCA Study Group, see the Appendix. ClinicalTrials.gov registration number: NCT00076726.