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Serum levels of interferon-α (IFN-α) are elevated in patients with systemic lupus erythematosus (SLE) with active disease. Serum from patients with active SLE (n = 14), inactive SLE (n = 8), immunoglobulin A nephritis (IgAN, n = 10) and rheumatoid arthritis (RA, n = 13) was analysed for levels of IFN-α. Levels are expressed as U/ml. P = 0·02 on analysis of variance.
