FDA approves RIABNI (rituximab-arrx), a biosimilar to Rituxan (rituximab), for adults with moderate to severe rheumatoid arthritis

The U.S. Food and Drug Administration (FDA) has approved Amgen’s RIABNI™ (rituximab-arrx), a biosimilar to Rituxan®, in combination with methotrexate for adults with moderate to severely active rheumatoid arthritis (RA) who have had an inadequate response to one or more tumor necrosis factor (TNF) antagonist therapies.

RIABNI is already approved for the treatment of adult patients with Non-Hodgkin’s Lymphoma (NHL), Chronic Lymphocytic Leukemia (CLL), Granulomatosis with Polyangiitis (GPA) (also called Wegener’s Granulomatosis) and Microscopic Polyangiitis (MPA).

“The approval of RIABNI is an important advancement for adults living with moderate to severe rheumatoid arthritis, a chronic inflammatory joint disease, who now have access to a proven and affordable treatment option,” said Murdo Gordon, executive vice president of Global Commercial Operations at Amgen.

“Our fully integrated portfolio of innovative and biosimilar medicines for inflammatory diseases reinforces our commitment to providing patients with high-quality and affordable treatment options that deliver substantial value to our healthcare system.”

RIABNI, a CD20-directed cytolytic antibody, was proven to be highly similar to, with no clinically meaningful differences in safety or efficacy from, Rituxan (rituximab) based on totality of evidence, which included comparative analytical, non-clinical and clinical data.

The randomized, double-blind, comparative clinical study compared the efficacy, safety, pharmacokinetics and immunogenicity of RIABNI versus rituximab reference product (RP) in patients with moderate to severe RA. Overall, 311 patients were randomized and treated with RIABNI, rituximab RP approved in the EU (rituximab-EU) or rituximab RP approved in the US (rituximab-US). The rituximab-US group transitioned to RIABNI in period 2 of the study. The primary efficacy endpoint, the change in disease activity score 28 using C-reactive protein (DAS28-CRP) from baseline at week 24, was within the predefined equivalence margin indicating equivalence in clinical efficacy between RIABNI and rituximab RP. Safety, pharmacokinetics and immunogenicity of RIABNI were similar to rituximab RP.

Amgen has a total of 11 biosimilars in its portfolio including potential treatments for chronic inflammatory diseases and cancer. There are currently five biosimilars approved in the U.S. and three approved in the European Union (EU) in Amgen’s portfolio.

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