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A correction has been published: N Engl J Med 2005;353(21):2311.

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Volume 353:1114-1123 September 15, 2005 Number 11
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Abatacept for Rheumatoid Arthritis Refractory to Tumor Necrosis Factor {alpha} Inhibition
Mark C. Genovese, M.D., Jean-Claude Becker, M.D., Michael Schiff, M.D., Michael Luggen, M.D., Yvonne Sherrer, M.D., Joel Kremer, M.D., Charles Birbara, M.D., Jane Box, M.D., Kannan Natarajan, Ph.D., Isaac Nuamah, Ph.D., Tracy Li, Ph.D., Richard Aranda, M.D., David T. Hagerty, M.D., and Maxime Dougados, M.D.

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ABSTRACT

Background A substantial number of patients with rheumatoid arthritis have an inadequate or unsustained response to tumor necrosis factor {alpha} (TNF-{alpha}) inhibitors. We conducted a randomized, double-blind, phase 3 trial to evaluate the efficacy and safety of abatacept, a selective costimulation modulator, in patients with active rheumatoid arthritis and an inadequate response to at least three months of anti–TNF-{alpha} therapy.

Methods Patients with active rheumatoid arthritis and an inadequate response to anti–TNF-{alpha} therapy were randomly assigned in a 2:1 ratio to receive abatacept or placebo on days 1, 15, and 29 and every 28 days thereafter for 6 months, in addition to at least one disease-modifying antirheumatic drug. Patients discontinued anti–TNF-{alpha} therapy before randomization. The rates of American College of Rheumatology (ACR) 20 responses (indicating a clinical improvement of 20 percent or greater) and improvement in functional disability, as reflected by scores for the Health Assessment Questionnaire (HAQ) disability index, were assessed.

Results After six months, the rates of ACR 20 responses were 50.4 percent in the abatacept group and 19.5 percent in the placebo group (P<0.001); the respective rates of ACR 50 and ACR 70 responses were also significantly higher in the abatacept group than in the placebo group (20.3 percent vs. 3.8 percent, P<0.001; and 10.2 percent vs. 1.5 percent, P=0.003). At six months, significantly more patients in the abatacept group than in the placebo group had a clinically meaningful improvement in physical function, as reflected by an improvement from baseline of at least 0.3 in the HAQ disability index (47.3 percent vs. 23.3 percent, P<0.001). The incidence of adverse events and peri-infusional adverse events was 79.5 percent and 5.0 percent, respectively, in the abatacept group and 71.4 percent and 3.0 percent, respectively, in the placebo group. The incidence of serious infections was 2.3 percent in each group.

Conclusions Abatacept produced significant clinical and functional benefits in patients who had had an inadequate response to anti–TNF-{alpha} therapy.


Source Information

From Stanford University Medical Center, Stanford, Calif. (M.C.G.); Bristol-Myers Squibb, Princeton, N.J. (J.-C.B., K.N., I.N., T.L., R.A., D.T.H.); the Denver Arthritis Clinic, Denver (M.S.); the University of Cincinnati Medical Center, Cincinnati (M.L.); the Center for Rheumatology, Immunology and Arthritis, Fort Lauderdale, Fla. (Y.S.); the Center for Rheumatology and Albany Medical College, Albany, N.Y. (J.K.); the University of Massachusetts Medical School, Worcester (C.B.); Carolina Bone and Joint, Charlotte, N.C. (J.B.); and Rene Descartes University, Service de Rhumatologie B, Paris (M.D.).

Address reprint requests to Dr. Genovese at the Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford University Medical Center, 1000 Welch Rd., Suite 203, Palo Alto, CA 94304, or at genovese{at}stanford.edu.

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