This international multi-center, randomized, controlled, open-label study investigated the pharmacokinetics, pharmacodynamics, efficacy and safety of BCD-020 (INN: rituximab, CJSC Biocad) versus MabThera® (INN: rituximab, F. Hoffmann La Roche, Ltd.) both administered as a monotherapy of patients with indolent non-Hodgkin's lymphoma.