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DOI: 10.1055/s-2007-963378
© Georg Thieme Verlag KG Stuttgart · New York
Successful Treatment of Steroid Refractory Active Ulcerative Colitis with Natural Interferon-β - an Open Long-Term Trial
Erfolgreiche Therapie von steroidrefraktärer aktiver Colitis ulcerosa mit natürlichem Interferon-β - eine offene LangzeitstudiePublication History
manuscript received: 24.4.2007
manuscript accepted: 3.7.2007
Publication Date:
13 December 2007 (online)

Zusammenfassung
Einleitung: Einige steroidrefraktäre Patienten mit aktiver Colitis ulcerosa (CU) sprechen auf Cyclosporin, Azathioprin oder 6-Mercaptopurin an. Dennoch verbleiben Patienten, die darunter kein Ansprechen zeigen. Der Einsatz von natürlichem Interferon-beta (nIFN-β) könnte eine Alternative darstellen. Aufgrund unserer guten Erfahrungen mit nIFN-β in einer kürzlich publizierten offenen Studie wurde die hier präsentierte Studie als Erweiterung unter der Hypothese konzipiert, dass unter höheren Dosen von nIFN-β (1,0 vs. 0,5 MIU) weniger häufig Rezidive auftreten. Patienten und Methoden: 46 steroidrefraktäre Patienten mit aktiver CU und mittlerem klinischen Aktivitätsindex (CAI) von 13,2 ± 3,7 (range 9 - 23) wurden unter Beibehaltung der Basismedikation (5-ASA/SASP plus Kortikosteroide) mit nIFN-β behandelt. In einer Induktionsphase von 8 Wochen erhielten 18 Patienten (Gruppe A) 0,5 MIU täglich und 28 Patienten (Gruppe B) 1,0 MIU täglich intravenös als Bolusinjektion. Patienten, die darunter eine komplette Remission erlangten (CAI-Abfall auf ≤ 4), erhielten eine Erhaltungstherapie mit nIFN-β in gleicher Dosierung wie unter Induktion dreimal wöchentlich und es erfolgte ein Ausschleichen des Kortikosteroids. Remissionen sowie Erhalt von Remissionen wurden ausgewertet. Ergebnisse: Unter Induktion traten in beiden Gruppen vergleichbar häufig komplette Remissionen auf: bei 16 / 18 Patienten (89 %) in Gruppe A und bei 24 / 28 Patienten (86 %) in Gruppe B. Die Erhaltungstherapie betrug im Mittel 60,0 ± 90,0 Wochen in Gruppe A und 52,7 ± 9,6 Wochen in Gruppe B. Darunter traten Rezidive (CAI-Anstieg ≥ 6) bei 5 / 16 Patienten (31 %) vs. 1 / 24Patienten (4 %) (p ≤ 0,05) auf, sodass bezüglich des Erhalts von Remissionen die 1,0 MIU-Gruppe der 0,5 MIU-Gruppe überlegen war. Bis auf die bekannten grippeähnlichen Nebenwirkungen wurde die Therapie von allen Patienten in beiden Gruppen gut vertragen. Fazit: nIFN-β könnte eine sichere und effektive Alternative zur Induktion und zum Erhalt von Remissionen bei Patienten mit steroidrefraktärer aktiver CU darstellen. Zur Validierung der präsentierten Ergebnisse ist seine Wirksamkeit in einer randomisierten, plazebokontrollierten Dosis-Findungs-Studie zu untersuchen.
Abstract
Introduction: In some steroid refractory patients with active ulcerative colitis (UC), treatment with immunosuppressive agents, such as cyclosporin, azathioprine or 6-mercaptopurin is effective. However, there are patients who fail to respond to these treatment options or who cannot tolerate them. Application of natural interferon-beta (nIFN-β) may offer an alternative. Following our positive results with nIFN-β in a previously published open-labeled study, the present study was designed as an extension with the hypothesis that administration of higher dosage of nIFN-β (1.0 vs. 0.5 MIU) could result in fewer relapse events. Patients and Methods: 46 steroid refractory patients with active UC and a mean clinical activity index (CAI) of 13.2 ± 3.7 (range 9 - 23) were treated with nIFN-β in addition to existing basic medication (5-ASA/SASP plus corticosteroids). During an induction period of eight weeks, 18 patients (group A) received 0.5 MIU nIFN-β daily and 28 patients (group B), 1.0 MIU nIFN-β daily intravenously as a bolus injection. Patients who achieved complete remission (decrease of CAI to ≤ 4) during the induction period received maintenance therapy with nIFN-β at the same dose level three times a week and corticosteroids were withdrawn. Remissions and maintenance of remissions were evaluated. Results: In both groups, a comparable number of complete remissions occurred during the induction period: in 16 / 18 patients (89 %) in group A and in 24 / 28 patients (86 %) in group B. Duration of maintenance treatment was 60.0 ± 90.0 weeks in group A and 52.7 ± 9.6 weeks in group B. Under this treatment, relapses (increase of CAI to ≥ 6) occurred in 5 / 16 patients (31 %) vs. 1 / 24 patients (4 %) (p ≤ 0.05). Hence, regarding maintaining remissions, the 1.0 MIU group outscored the 0.5 MIU group. Apart from known flu-like side effects, the therapy was well tolerated by all patients in both groups. Conclusion: nIFN-β may be a safe and effective alternative to induce and maintain remissions in patients with steroid refractory active UC. To validate the presented results, its effect has to be investigated in a randomized, placebo-controlled dose-finding trial.
Schlüsselwörter
Colitis ulcerosa - Interferon-beta - Steroidrefraktärität - Remission - Erhaltung
Key words
ulcerative colitis - interferon-beta - steroid refractory - remission - maintenance
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Prof. Dr. med. Dipl.-Biochem. E. Musch
Marienhospital Bottrop
Josef-Albers-Str. 70
46236 Bottrop
Germany
Phone: ++ 49/20 41/1 06 10 01
Fax: ++ 49/20 41/1 06 10 19
Email: eugen.musch@mhb-bottrop.de