Rituximab is an agent with a variety of immunologic effects mediated thorugh its effects on B-lymphocytes. Unfortunately, there is no effective therapy for severe interstitial lung disease associated with connective tissue disease (CTD-ILD), progressing despite maximal conventional immunosuppression. Two observational studies, one with 8 and one with 15 patients revealed conflicting results. One very small prospective study with 8 patients who received rituximab and six who had not had been performed and revealed encouraging results(Daoussius et al). These remain preliminary findings and more research clearly is required.
Keir GJ, Maher TM, Hansell DM, Denton CP, Ong VH, Singh S, Wells AU, Renzoni EA
Severe interstitial lung disease in connective tissue disease: rituximab as rescue therapy.