• What Is Skinny Labeling — And Will It Work For Biosimilars?

    “Skinny labeling” refers to the practice of follow-on drug manufacturers seeking approval for some but not all the indications for which the branded drug has been approved. In the small molecule drug world, it has been a successful strategy for generic drug makers to get around the brand’s follow-on “new use” patents that keep the brand from falling off the “patent cliff” long after the expiration of the original patents. This strategy is starting to be used in the biosimilar realm.

  • How Will Trump’s New FTC/DOJ Reporting Requirements Impact Biosimilars?

    On Oct. 10, 2018, President Trump signed into law the Patient Right to Know Drug Prices Act, which, among other things, requires that certain biosimilar applicants and reference product sponsors involved in patent disputes file their settlement agreements with the FTC and the DOJ. This article summarizes the key provisions of the new law and discusses its limitations.

  • A Biosimilar Applicant’s (Illusory?) Right To Declaratory Relief

    This article explains why having the right and option to seek declaratory relief is still important to a biosimilar applicant despite the patent resolution mechanism provided by BPCIA, examines the limitations on declaratory judgment actions imposed by BPCIA, and discusses recent court cases addressing biosimilar applicants’ rights to declaratory relief.

  • Recent Supreme Court Decisions On Inter Partes Review — What Biosimilar Developers Need To Know

    The U.S. Supreme Court recently issued two decisions related to inter partes review (IPR). This article will briefly introduce IPR, discuss the Supreme Court’s decisions, explain how these decisions may impact IPR and biosimilar companies, and suggest how biosimilar companies should respond.

  • The Biosimilar Patent Dance: What Can We Learn From Recent BPCIA Litigation?

    Of the 17 biosimilar products litigated under BPCIA to date, in most cases (about 70 percent), the applicants engaged in and completed the patent dance before the lawsuits (setting aside allegations of noncompliance with the disclosure requirements).  So far, in three instances, the biosimilar applicants have declined to dance outright.

  • Shall We (Patent) Dance? — Key Considerations For Biosimilar Applicants

    The Biologics Price Competition and Innovation Act of 2009 (BPCIA), enacted in March 2010, provides for an elaborate process of information exchange — known as the “patent dance” — between a biosimilar applicant and a reference product sponsor (RPS) intended to resolve potential patent disputes in an orderly and expeditious fashion. 

  • Patent Eligibility Of Biologic & Biosimilar Patents — A Primer

    If the trend continues, inventions directed to methods of treatment (especially for follow-on indications), or even compositions and formulations, are susceptible to Section 101 challenges, whereas those directed to delivery systems or manufacturing processes appear to be still safely within the “patent eligible” subject matters.

  • What Types Of Life Sciences Patents Are Vulnerable To Section 101 Challenges?

    To be entitled to a patent, an invention must satisfy a number of patentability requirements, including the “patent eligibility” requirement under 35 U.S.C. § 101.  In Part 1 of this three-part series, we reviewed the origin of the three “patent ineligible” subject matters, the evolution of the U.S. Supreme Court’s jurisprudence on the issue, and how the Supreme Court’s decision in Mayo Collaborative Services v. Prometheus Labs, Inc. changed the patent-eligibility landscape for life science patents.

  • The Post-Mayo World Of Life Sciences Patents

    To be entitled to a patent, an invention must satisfy a number of patentability requirements, including the “patent eligibility” requirement under 35 U.S.C. § 101.  In this three-part series, we will look at how the U.S. Supreme Court’s jurisprudence on patent eligibility has evolved, examine the impact of its March 2012 decision in Mayo Collaborative Services v. Prometheus Labs, Inc. on life sciences patent litigation in lower courts, and discuss what it means for patent eligibility of biologic and biosimilar patents.  

  • Amgen v. Hospira: The Federal Circuit’s Latest On The Biosimilar Patent Dance

    In the Amgen v. Hospira decision, issued on Aug. 10, 2017, the U.S. Court of Appeals for the Federal Circuit gave a little more ammunition back to the biologics manufacturers (though on its face, it was a loss for Amgen), opining that the “could reasonably be asserted” language in the statute allows a biologics sponsor to initially include in the list any patent that it believes in good faith “could” reasonably be asserted, even if the belief is mistaken.


Limin Zheng

Limin Zheng is a partner at GCA Law Partners LLP. Her practice emphasizes patent and other complex technology litigation and spans a broad range of technologies, with a focus on biotechnology, biotherapeutics, and medical devices. She can be reached at