Journal
ANNALS OF INTERNAL MEDICINE
Volume 132, Issue 11, Pages 871-+Publisher
AMER COLL PHYSICIANS
DOI: 10.7326/0003-4819-132-11-200006060-00004
Keywords
relaxin; recombinant proteins; scleroderma, systemic; skin diseases; fibrosis
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Background: Relaxin is a pregnancy-related hormone that has tissue remodeling and antifibrotic effects. Systemic sclerosis (scleroderma) is characterized by fibrosis of the skin, vasculature, and internal organs. Objective: To assess the efficacy, safety, and dose-response effect of recombinant human relaxin in patients with scleroderma. Design: Multicenter, parallel-group, randomized, double-blind, placebo-controlled trial. Setting: Academic referral centers. Patients: 68 patients who had had stable, diffuse scleroderma (moderate to severe) for less than 5 years. Intervention: Recombinant human relaxin. 25 or 100 mu g/kg of body weight per day, or placebo administered by continuous subcutaneous infusion over 24 weeks. Measurements: Modified Rodnan skin score was the primary efficacy measure. Secondary measurements were pulmonary function, the Health Assessment Questionnaire, and other measures of scleroderma that reflected fibrosis. Results: Patients who received 25 mu g/kg of recombinant human relaxin per day had significantly lower skin scores than those who received placebo (mean change, -3.6 at 4 weeks [P = 0.021], -7.5 at 12 weeks [P < 0.001], and -8.7 at 24 weeks [P = 0.040]). Similar trends were noted in other outcome measures, including forced vital capacity, measures of oral aperture and hand extension, functional status, and global assessment. Patients who received 100 mu g/kg of relaxin per day did not differ from those who received placebo. Drug-related adverse events included menometrorrhagia, reversible anemia, and complications of the subcutaneous drug administration system (site irritation and local infection). Conclusions: Twenty-four weeks of recombinant human relaxin. 25 mu g/kg per day, is associated with reduced skin thickening, improved mobility, and improved function in patients with moderate to severe diffuse scleroderma.
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