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Chronic graft-versus-host disease (cGVHD) is the main cause of late nonrelapse mortality and morbidity after allogeneic stem cell transplantation (allo-SCT). To improve such patients’ outcomes, we conducted a phase 2, prospective, multicenter trial to test the efficacy of the addition of rituximab to corticosteroids (CSs) and cyclosporine A (CsA) as first-line therapy for newly diagnosed cGVHD after allo-SCT. Twenty-four patients (median age, 47 years) with mild (n = 2), moderate (n = 7), or severe (n = 15) cGVHD were included. All patients received rituximab 375 mg/m² weekly for 4 weeks, followed by a second course 1 month later for patients with partial response. Twenty of 24 patients (83%) were in response at 1 year. Furthermore, among 19 evaluable patients, 14 (74%) were off CSs. The estimated 1-year overall survival was 83%, and the 1-year cumulative incidence of nonrelapse mortality was 14%. One …