A systematic review 1 including 6 RCTS with a total of 812 subjects was abstracted in DARE. The pooled weighted mean lifetime survival for the control group was 3.42 years per patient, and for the interferon-treated group it was 3.42 (or 3.87, 95% CI 2.88 to 4.06 estimated by the method of Simes).
Comment: The quality of evidence is downgraded by limitations in review methodology.
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