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Results from the Minocycline in Rheumatoid Arthritis (MIRA) Trial

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By Bluhm GB; Sharp JT; Tilley BC; Alarcon GS; Cooper SM; Pillemer SR; Clegg DO; Heyse SP; Trentham DE; Neuner R; Kaplan DA; Leisen JC; Buckley L; Duncan H; Tuttleman M; Li S; Fowler SE • www.ProHealth.com • April 18, 2000


OBJECTIVE: To assess radiographically (by making film records of body’s internal structures by using X-rays or gamma rays) determined disease progression in patients in the Minocycline (a tetracycline antibiotic) in Rheumatoid Arthritis (MIRA) Trial.

METHODS: A double blind, randomized, multicenter, 48 week trial of oral minocycline (200 mg/day) or placebo in 6 clinical centers in the United States. Patients include 219 adults with active RA previously receiving limited treatment with disease modifying drugs. Posteroanterior films of the hands from baseline and final visits, blinded for sequence, were read for erosions and joint space narrowing by trained observers. Outcomes included rate of disease progression (change/month) and percentage of patients with progression from baseline, newly involved joints, and newly erosive disease.

RESULTS: Using intent-to-treat analyses, progression rates for erosions (0.11 +/- 0.42 minocycline, 0.17 +/- 0.41 placebo; p = 0.47) and joint space narrowing (0.16 +/- 0.55 minocycline and 0.23 +/- 0.71 placebo; p = 0.14) were similar. (Power 43% to detect a 50% difference.) Newly erosive joints occurred more frequently in the placebo group (44 vs 32%; p = 0.08), not a statistically significant difference.

CONCLUSION: Radiographic measurement of disease progression using 4 measures failed to show a significant difference between minocycline and placebo treatment, although for all methods there was a trend toward treatment benefit, consistent with reported clinical results. A one year trial duration, high measurement variability, and slow rate of radiographic progression in this cohort may explain the low power to detect a treatment effect. The measurement that denoted "newly involved" joints was most sensitive in detecting change. In future trials longer-term assessment (minimum 2 years) of radiographic changes and further comparison of measures of disease progression are warranted.

Source: J Rheumatol (Canada) Jul 1997, 24 (7) p1295-302




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