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.

FDA Accepts Formycon and Zydus’ Proposed Pembrolizumab Biosimilar for Review

On October 13, 2026, Formycon and Zydus announced that the FDA accepted for review the Biologics License Application for FYB206, a proposed biosimilar to Merck’s KEYTRUDA® (pembrolizumab). This is the first publicly announced FDA acceptance of an application for a proposed KEYTRUDA® biosimilar. Formycon also submitted the regulatory dossier to…

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Genentech and Biocon Settle Pertuzumab Biosimilar BPCIA Litigation

On October 14, 2026, the U.S. District Court for the District of New Jersey entered an order dismissing without prejudice all claims in Genentech Inc. and Hoffmann-La Roche Inc.’s BPCIA litigation against Biocon Biologics Inc. concerning its proposed pertuzumab biosimilar. The same day, Biocon announced that it had entered into a…

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Sandoz and mABxience Announce Collaboration for Proposed Emicizumab Biosimilar

On September 18, 2026, Sandoz announced a licensing, development, manufacturing, and commercialization agreement with mAbxience for a proposed biosimilar to Genentech’s HEMLIBRA® (emicizumab).   HEMLIBRA® is approved for the treatment of hemophilia A. According to Sandoz, the collaboration would add its first hemophilia biosimilar to the company’s pipeline. Under the agreement,…

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Biocon’s Pertuzumab Biosimilar Receives Positive CHMP Opinion Under EMA’s Tailored Clinical Approach

Full frame of molecular structure of liquids in motion.

On September 22, 2026, Biocon Biologics Limited (“Biocon”) announced that the European Medicines Agency’s (“EMA”) Committee for Medicinal Products for Human Use (“CHMP”) issued a positive opinion recommending marketing authorization for PEBRILZO® (pertuzumab), its biosimilar to Genentech’s PERJETA®. According to Biocon, PEBRILZO® is the first monoclonal antibody biosimilar to receive…

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