Effects of rituximab on resistant SLE disease including lung involvement

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Abstract
We present a retrospective review of 11 patients with refractory systemic lupus erythematosus (SLE) treated with rituximab after failing corticosteroids and at least one other immunosuppressive drug. We measured clinical response using the Classic British Isles Lupus Assessment Group (BILAG) index, serum complement and reduction in maintenance prednisolone dose. B cells were measured using flow cytometry, and lung function testing was used to assess severe pulmonary disease (three patients). The median patient age was 42 years (range, 25–64) with median disease duration 6 years (range, 2–12). In all, 10 of 11 patients responded initially, with median global BILAG reduction of 7.5 at 6 months (P = 0.007), with loss of all A and B scores by 7 months. Rituximab treatment was associated with normalisation of complement (C3 P = 0.008, C4 P = 0.018) and reduction in steroid requirement, median reduction 15 mg/day (P = 0.036). In 9 of 10 patients who responded, all other immunosuppressants were stopped. There was no significant difference in anti-dsDNA antibody titres in these responders, but they were negative or had low titres at baseline. B-cell depletion continued for median 4 months (range, 2–9), and disease flare occurred at a median 6.6 months (range, 1.5–23) and was preceded by B-cell recovery in all but two patients. Rituximab was beneficial in refractory SLE including severe neurological and cardiorespiratory disease by inducing disease remission, allowing withdrawal of other agents and reduction in steroid requirement. Rituximab appeared to stabilise and possibly improve progressive lung disease.