Welcome to the Big Molecule Watch!

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Goodwin’s award-winning Big Molecule Watch is the best resource for daily updates and analyses of regulatory issues, litigation, legislation, and other news in the world of biologics, biosimilars and related technologies. The editors of this blog have collectively been watching and engaging with the world of biologics and biosimilars (“big molecules”) since before the inception of the biosimilar industry in the U.S.  With extensive experience representing clients at all stages of a biologic’s or biosimilar’s lifecycle, from research and development, to patents, to regulatory application and approval, and through litigation and appeals, we are excited to share our observations and insights as the industry and the law continues to develop in this exciting area.

This blog focuses on “big molecules” as opposed to “small molecules.” Small molecule drugs have low molecular weight, a simple and well-defined structure, and are chemically synthesized. In contrast, “big molecule” drugs have high molecular weight, complex structures, and are derived from living organisms. For example, aspirin is small molecule while a monoclonal antibody is a big molecule. For further reading on big molecules, consider FDA's resources on biologics.

Bio-Thera and Intas Expand Golimumab Biosimilar Partnership to India

On March 23, 2026, Bio-Thera Solutions announced an expansion of its existing partnership with Intas Pharmaceuticals for BAT2506, its golimumab biosimilar referencing Janssen’s SIMPONI®. The updated agreement grants Intas exclusive commercialization and licensing rights in India and marks Bio-Thera’s first biosimilar commercialization partnership focused on India. Golimumab is a human…

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Celltrion Announces AVTOZMA (tocilizumab-anoh) Now Available in U.S.

On March 16, 2026, Celltrion, Inc. announced the U.S. commercial launch of AVTOZMA® (tocilizumab-anoh) SC, a subcutaneous formulation of its tocilizumab biosimilar referencing Roche’s ACTEMRA. Celltrion had previously launched its intravenous AVTOZMA® in October 2025. With this new launch, AVTOZMA® becomes one of the first tocilizumab biosimilars to have both…

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FDA Approves Johnson & Johnson’s TECVAYLI® plus DARZALEX FASPRO® for the Treatment of Relapsed/Refractory Multiple Myeloma

Johnson & Johnson announced on March 5, 2026 that the U.S. Food and Drug Administration (FDA) approved TECVAYLI® (teclistamab-cqyv) plus DARZALEX FASPRO® (daratumumab and hyaluronidase-fihj) for the treatment of adults with relapsed or refractory multiple myeloma (RRMM) who have received at least one prior line of therapy.  TECVAYLI® (teclistamab-cqyv) is…

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FDA Issues Draft Guidance Further Streamlining Biosimilar Development

On March 9, 2026, the U.S. Food and Drug Administration (FDA) issued new draft guidance aimed at further streamlining the development of biosimilar and interchangeable biosimilar products by reducing certain clinical pharmacokinetic (PK) study requirements when scientifically justified. The announcement builds on an earlier FDA initiative announced in October that…

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