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.

Samsung Bioepis Secures Marketing Approval in Korea for its Biosimilar to Amgen’s Bone Cancer Drug Xgeva

Samsung Bioepis Co., Ltd. has secured marketing approval in Korea for XBRYK, its biosimilar to Amgen’s bone cancer drug XGEVA, used to prevent fractures in those with bone metastases from solid tumors or multiple myeloma and to treat rare conditions like unresectable giant cell tumors. Earlier this year, Samsung also…

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Teva and Alvotech Announce FDA Approval of Interchangeability for SELARSDI (ustekinumab-aekn) with STELARA (ustekinumab)

On May 5, 2025, Teva and Alvotech announced that the U.S. Food and Drug Administration (FDA) approved SELARSDI (ustekinumab-aekn) injection as an interchangeable biosimilar to the reference product STELARA (ustekinumab).  SELARSDI is approved for all indications matching the reference product, including for the treatment of moderate to severe plaque psoriasis…

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Join Us! The Future of Biotech Regulation Webinar

As part of Goodwin’s webinar series, What’s Next: Life Sciences at a Crossroads, Matthew Wetzel and Elizabeth Mulkey will be diving into highlights from the Trump 47 Executive Orders on Lowering Drug Prices and Increasing Domestic Manufacturer and Regulatory Relief to Promote Domestic Production of Critical Medicines, and Washington’s current…

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