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.

AbbVie Regulatory Submission and Deal News

AbbVie Submits Regulatory Application to FDA for Subcutaneous SKYRIZI On April 27, 2026, AbbVie announced that it has submitted a regulatory application to the FDA seeking approval for SKYRIZI (risankizumab-rzaa) for subcutaneous induction for the treatment of adult patients with moderately to severely active Crohn’s disease.  AbbVie states that its application…

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Intellia Initiates Rolling BLA Submission for In Vivo CRISPR Therapy in Hereditary Angioedema

On April 27, 2026, Intellia Therapeutics (“Intellia”) announced that it has begun a rolling submission of a biologics license application (BLA) to the FDA for lonvoguran ziclumeran (lonvo-z), an investigational therapy for hereditary angioedema (HAE). Lonvo-z, previously known as NTLA-2002, is designed as a one-time, outpatient-administered treatment using in vivo…

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Biocon Launches Denosumab Biosimilars

On April 7, 2026, Biocon Limited announced that it had launched BOSAYA™ (denosumab-kyqq) and AUKELSO™ (denosumab-kyqq) in the United States.  Both products are RANK ligand inhibitors used to treat conditions such as osteoporosis and cancer-related skeletal complications.  BOSAYA™ and AUKELSO™ have been designated as interchangeable with their corresponding reference products,…

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