Arthritis & RheumatismVolume 43, Issue 6 p. 1346-1352 Clinical ScienceFree to Read Successful treatment of active ankylosing spondylitis with the anti–tumor necrosis factor α monoclonal antibody infliximab Jan Brandt, Jan Brandt Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanySearch for more papers by this authorHildrun Haibel, Hildrun Haibel Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanySearch for more papers by this authorDaniel Cornely, Daniel Cornely Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanySearch for more papers by this authorWerner Golder, Werner Golder Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanySearch for more papers by this authorJosé Gonzalez, José Gonzalez Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanySearch for more papers by this authorJaqueline Reddig, Jaqueline Reddig Essex Pharma, Munich, GermanySearch for more papers by this authorWolfgang Thriene, Wolfgang Thriene Essex Pharma, Munich, GermanySearch for more papers by this authorJoachim Sieper, Joachim Sieper Benjamin Franklin Hospital, Free University Berlin, and German Research Center, Berlin, GermanySearch for more papers by this authorJürgen Braun, Corresponding Author Jürgen Braun Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanyRheumatology Section, Klinikum Benjamin Franklin, Free University Berlin, Hindenburgdamm 30, 12200 Berlin, GermanySearch for more papers by this author Jan Brandt, Jan Brandt Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanySearch for more papers by this authorHildrun Haibel, Hildrun Haibel Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanySearch for more papers by this authorDaniel Cornely, Daniel Cornely Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanySearch for more papers by this authorWerner Golder, Werner Golder Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanySearch for more papers by this authorJosé Gonzalez, José Gonzalez Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanySearch for more papers by this authorJaqueline Reddig, Jaqueline Reddig Essex Pharma, Munich, GermanySearch for more papers by this authorWolfgang Thriene, Wolfgang Thriene Essex Pharma, Munich, GermanySearch for more papers by this authorJoachim Sieper, Joachim Sieper Benjamin Franklin Hospital, Free University Berlin, and German Research Center, Berlin, GermanySearch for more papers by this authorJürgen Braun, Corresponding Author Jürgen Braun Benjamin Franklin Hospital, Free University Berlin, Berlin, GermanyRheumatology Section, Klinikum Benjamin Franklin, Free University Berlin, Hindenburgdamm 30, 12200 Berlin, GermanySearch for more papers by this author First published: 26 March 2001 https://doi.org/10.1002/1529-0131(200006)43:6<1346::AID-ANR18>3.0.CO;2-ECitations: 308AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Objective Tumor necrosis factor α (TNFα) has been detected in sacroiliac joint biopsy specimens from patients with spondylarthropathy. The present open pilot study was undertaken to test the efficacy of the anti-TNFα monoclonal antibody infliximab in the treatment of active ankylosing spondylitis (AS). Methods Eleven patients with AS of short duration (median 5 years, range 0.5–13 years) that had been active for at least 3 months (range 3–72 months) were treated with 3 infusions of infliximab (at weeks 0, 2, and 6), in a dosage of 5 mg/kg. Ten of the 11 patients had elevated C-reactive protein (CRP) levels (>6 mg/liter) before treatment; these elevations were known to have had persisted >1 year in at least 3 patients. The Bath AS Disease Activity Index (BASDAI), the Bath AS Functional Index (BASFI), pain as measured on a visual analog scale, and the Bath AS Metrology Index (BASMI) were assessed. Quality of life was assessed using the Short Form 36 instrument. Laboratory markers of disease activity, including interleukin-6 (IL-6) levels, were determined. Dynamic magnetic resonance imaging (MRI) of the spine was performed in 5 patients. Results One patient withdrew from the study due to the occurrence of urticarial xanthoma 8 days after the first infusion. At study enrollment, 3 of 5 patients had evidence of spinal inflammation (spondylitis and spondylodiscitis) as detected by MRI; followup MRI 2–6 weeks after the third infusion revealed improvement in 2. Improvement of ≥50% in activity, function, and pain scores was documented in 9 of 10 patients; the median improvement in the BASDAI after 4 weeks was 70% (range 41–94%). This clear-cut benefit lasted for 6 weeks after the third infusion in 8 of 10 patients. The median CRP level decreased from 15.5 mg/liter (range <6–90.8) to normal, and the median IL-6 level from 12.4 mg/liter (range 0–28.4) to normal (<5). 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