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.

Third Circuit Affirms Denial of Stelara Biosimilar Injunction

As previously reported, litigation between Johnson & Johnson and Janssen (“J&J”) and Samsung Bioepis (“Samsung”) involving Samsung’s Stelara biosimilar, PYZCHIVA (ustekinumab-ttwe) (previously known as SB17), was resolved via a settlement agreement in 2023.  Under the terms of the agreement, Samsung received a limited patent license, prohibiting Samsung from sublicensing with…

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FDA Issues Draft Guidance on Safety Testing for Gene Editing Therapies

On April 14, 2026, the United States Food and Drug Administration (“FDA”) issued a draft guidance for sponsors seeking approval of human gene-editing therapy products involving gene-editing technologies.  The guidance provides recommendations for assessing the safety of genome-editing therapies to bring effective treatments to patients. The guidance includes considerations for…

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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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