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.

Genentech Files BPCIA Patent Infringement Suit Against Biocon Over Proposed PERJETA Biosimilar

On July 29, 2026, Genentech, Inc. (“Genentech”) and Hoffmann-La Roche Inc. filed a complaint in the U.S. District Court for the District of New Jersey against Biocon Biologics Inc. (“Biocon”) and related entities, alleging infringement of 28 patents relating to Genentech’s PERJETA and Biocon’s proposed biosimilar, Bmab1500. As we previously…

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Celltrion Targets European Secukinumab Market with EMA Filing for CT-P55

Celltrion has submitted a Marketing Authorization Application to the European Medicines Agency (“EMA”) for CT-P55, its biosimilar to Novartis’ COSENTYX® (secukinumab). The application covers all indications held by COSENTYX® in Europe, including plaque psoriasis, psoriatic arthritis, axial spondyloarthritis, juvenile idiopathic arthritis, and hidradenitis suppurativa. According to Celltrion, CT-P55 has demonstrated…

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Formycon and OneSource Specialty Pharma Partner to Manufacture Biosimilars

Formycon AG (“Formycon”) announced its partnership with OneSource Specialty Pharma Limited (“One Source”) on July 14, 2026. OneSource, located in Bangalore, India, will complement Formycon’s biosimilar development experience with its biologics manufacturing capabilities. OneSource has an integrated biologics platform that ranges from cell line development to commercial fill-finish and five…

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