Recombinant human interleukin 10 in the treatment of patients with mild to moderately active Crohn's disease. The Interleukin 10 Inflammatory Bowel Disease Cooperative Study Group.
OBJECTIVE
Interleukin 10 (IL-10) is an anti-inflammatory, immunomodulatory cytokine that regulates mucosal inflammation. This study evaluated the safety, tolerance, and efficacy of recombinant human IL-10 (rhuIL-10) for mild to moderately active Crohn's disease.


METHODS
We conducted a 24-week multicenter, prospective, randomized, double-blind, placebo-controlled, and sequential-escalating-dose study. Ninety-five patients with Crohn's Disease Activity Index of 200-350, not presently undergoing corticosteroid, mesalamine, or immunosuppressive therapy, were treated with subcutaneous rhuIL-10 (1, 5, 10, or 20 microg/kg) or placebo once daily for 28 consecutive days. Patients were followed up for 20 weeks after treatment. Evaluation of safety and tolerance was the first objective, and efficacy was the second objective.


RESULTS
Adverse effects were dose-related, mild-to-moderate in severity, and reversible. Asymptomatic and reversible anemia and thrombocytopenia were observed at higher doses. No withdrawal or delayed adverse effects were evident during 20 weeks of follow-up. At the end of treatment (day 29), intent-to-treat analysis showed that 23.5% (confidence interval [CI], 6.8%-49.9%) of patients receiving 5 micro/kg rhuIL-10 experienced clinical remission and endoscopic improvement; 0% (CI, 0%-14.8%) of patients in the placebo group did. Higher doses of recombinant human IL-10 were less effective than 5 microg/kg. No rhuIL-10 serum accumulation and no antibody against IL-10 were detected after 4 weeks.


CONCLUSIONS
Subcutaneous rhuIL-10 administered daily for 28 days to patients with mild to moderately active Crohn's disease is safe, well-tolerated, and shows clinical and endoscopic improvement.
Fedorak
R N
RN
Division of Gastroenterology, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada. Richard.Fedorak@ualberta.ca
Gangl
A
A
Elson
C O
CO
Rutgeerts
P
P
Schreiber
S
S
Wild
G
G
Hanauer
S B
SB
Kilian
A
A
Cohard
M
M
LeBeaut
A
A
Feagan
B
B
D000328:Adult; D000368:Aged; D003424:Crohn Disease / Q000188:drug therapy* / Q000473:pathology / Q000503:physiopathology*; D004305:Dose-Response Relationship, Drug; D016145:Endoscopy, Digestive System; D005260:Female; D006801:Humans; D007279:Injections, Subcutaneous; D016753:Interleukin-10 / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011994:Recombinant Proteins / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics / Q000627:therapeutic use; D012008:Recurrence; D012720:Severity of Illness Index; D016896:Treatment Outcome
D011994:Recombinant Proteins; D016753:Interleukin-10