Welcome to the Big Molecule Watch!


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.

Update on Ophthalmic Anti-VEGF Therapeutics

Below we provide an update on several ophthalmic anti-VEGF therapeutics currently being studied in clinical trials. EYLEA® HD (Aflibercept, 8 mg) Regeneron announced positive two-year (96 weeks) results from its PULSAR trial investigating Eylea® HD (aflibercept, 8 mg) with 12- and 16-week dosing regimens compared to EYLEA® (aflibercept, 2 mg)…

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Recent Adalimumab Biosimilar Developments

FDA grants interchangeable designation to Pfizer’s adalimumab biosimilar – On October 5, 2023, Pfizer Inc. announced that the U.S. Food and Drug Administration (FDA) has designated ABRILADA (adalimumab-afzb) as an interchangeable biosimilar to HUMIRA (adalimumab). ABRILADA was originally approved by the FDA in November 2019. The new interchangeable designation was…

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Biogen Announces FDA Approval of TOFIDENCE, a Tocilizumab Biosimilar Referencing ACTEMRA

On September 29, 2023, Biogen announced the FDA approval of TOFIDENCE (tocilizumab-bavi) intravenous formulation which is the first tocilizumab biosimilar approved by the FDA in the United States.  TOFIDENCE is approved for the treatment of moderately to severely active rheumatoid arthritis (RA), polyarticular juvenile idiopathic arthritis (PJIA), and systemic juvenile…

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Katalin Karikó and Drew Weissman Awarded Nobel Prize in Physiology or Medicine For Discoveries Relating to mRNA Vaccines

Today, the Nobel Assembly at Karolinska Institutet announced that the Nobel Prize in medicine was awarded to Katalin Karikó and Drew Weissman “for their discoveries concerning nucleoside base modifications that enabled the development of effective mRNA [messenger RNA] vaccines against COVID-19.”  Dr. Karikó is a Professor at Szeged University and…

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IRA Drug Price Negotiation Program Litigation Updates – Denial of PI Motion and Motion to Dismiss in Chambers of Commerce Case and New Complaint Filed by Novo Nordisk

Denial of Motion to Dismiss and Motion for Preliminary Injunction in Chambers of Commerce case On Friday, September 29, the court in Dayton Area Chamber of Commerce et al. v. Becerra et al. (S.D. Ohio, Judge Newman) issued the first substantive order addressing legal challenges to the Drug Price Negotiation…

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Regulatory Update on Alvotech’s AVT02, a High-Concentration Interchangeable Adalimumab Biosimilar

On September 20, Alvotech announced that FDA has accepted the resubmission of its Biologics License Application (BLA) for AVT02, a high concentration, interchangeable biosimilar to HUMIRA (adalimumab). FDA has set a Biosimilar User Fee Act (BsUFA) goal date for approval of the resubmitted AVT02 BLA of February 24, 2024.  As…

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FDA Grants Priority Review to Merck’s Application for KEYTRUDA (pembrolizumab) as Part of Treatment for Early-Stage Cervical Cancer

On September 20, Merck announced that the U.S. Food and Drug Administration (FDA) granted priority review status to Merck’s supplemental Biologics License Application (sBLA) seeking approval for its anti-PD-1 therapy KEYTRUDA (pembrolizumab) in combination with external beam radiotherapy (EBRT) plus concurrent chemotherapy, followed by brachytherapy, as a treatment for newly…

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Recent Biosimilar Commercialization Developments

Insulin Biosimilars: Meitheal Pharmaceuticals, Inc. has announced an exclusive licensing agreement with Tonghua Dongbao Pharmaceuticals Co., Ltd. to commercialize Tonghua Dongbao’s three insulin biosimilars (insulin aspart, insulin lispro, and insulin glargine) in the U.S. market.  Meitheal and Tonghua Dongbao will be jointly responsible for development and supply, with the expectation…

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Scheduling Order Issued in REGENXBIO v. Sarepta Litigation

As we previously reported, REGENXBIO Inc. and the Trustees of the University of Pennsylvania filed suit in Delaware in June 2023 against Sarepta Therapeutics, Inc., Sarepta Therapeutics Three, LLC, and Catalent, Inc., alleging infringement of U.S. Patent No. 11,680,274 by Sarepta’s gene therapy product, ELEVIDYS (delandistrogene moxeparvovec-rokl).  Sarepta and Catalent each…

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