Keeping pace with the ever-changing life sciences industry, Morrison Foerster stays on top of the trends and political, legal, and economic drivers to support striking the balance between innovative discovery and purposeful business planning to assure our clients continued success. MoFo Life Sciences shares timely legal and business insights and in-depth analyses on trends and the complex technologies at the heart of the global pharmaceutical, biotechnology, diagnostics, medical devices, digital health, and AgTech fields.Learn more about our <a href="https://www.mofo.com/capabilities/life-sciences-healthcare" target="_self">Life Sciences practice</a>.<h2 dir="ltr">ABOUT MORRISON FOERSTER</h2>Morrison Foerster is a leading global law firm that transforms complexity into advantage for its clients. Our clients include some of the largest financial institutions, banks, consulting and accounting firms, and Fortune 100, technology, and life sciences companies. Highlighting the firm’s commitment to client service, leadership in market-changing deals and impact litigation, and values-based culture, Morrison Foerster has been repeatedly recognized as one of the top 10 firms on The American Lawyer’s A-List. Year after year, the firm receives significant recognition from Chambers and The Legal 500 across their various guides, including Global, USA, Asia‑Pacific, Europe, UK, Latin America, and FinTech Legal. Our lawyers passionately care about delivering legal excellence while living our values. Morrison Foerster has a long-standing commitment to creating a culture that respects and celebrates differences, while providing an inclusive environment. The firm has achieved Mansfield Certification Plus since 2018 as a result of successfully reaching at least 30 percent women, communities of color, and LGBTQ+ lawyer representation in a notable number of current leadership roles and committees. The firm also has a long history of commitment to the community and society through providing pro bono legal services, including litigating for civil rights and civil liberties, improving public education and fostering the wellbeing of children, advocating for veterans, promoting international human rights, enforcing the right to asylum, and safeguarding the environment.

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Dr. Meghan Poon counsels clients on patent preparation and prosecution, portfolio strategy, and IP due diligence in the areas of biotechnology and biologics. She has significant experience in diverse technologies including antibodies, cell therapies, gene therapies, diagnostics, and gene-edited plants. She represents clients ranging from large international pharmaceutical companies to midsized companies, startups, and universities.Meghan has filed numerous Patent Term Extension applications to secure additional term for her clients’ patents, which cover FDA-approved products. In addition, Meghan has extensive experience addressing complex obviousness-double patenting and subject matter eligibility issues impacting her clients’ patent portfolios. Meghan also represents clients in both investor-side and target-side due diligence, in deals from seed funding to initial public offerings.Prior to law school, Meghan attended graduate school at the University of California, Los Angeles, where she received a Ph.D. in biological chemistry based on her work on protein-protein and protein-DNA interactions at a molecular level. Meghan is the author of several scientific publications and has presented her research at international conferences.Meghan received her J.D. from the University of Southern California Law School and spent a year as a visiting student at Santa Clara University, where she focused on intellectual property.

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Dr. Meghan Poon counsels clients on patent preparation and prosecution, portfolio strategy, and IP due diligence in the areas of biotechnology and biologics. She has significant experience in diverse technologies including antibodies, cell therapies, gene therapies, diagnostics, and gene-edited plants.

Meghan Poon

Wolfgang advises clients on contentious and non-contentious matters involving their most valuable intellectual property assets in life sciences, digital, and high-tech industries.His subjects of focus include research and development collaborations, complex licensing agreements, and other technology transactions, as well as know-how protection strategies, and employee invention law. He also has substantial experience in litigating patents, trademarks, and other intellectual property assets, often in a multijurisdictional context. In addition, Wolfgang and his team frequently clear trademarks and ad campaigns and prosecute trademark applications.Wolfgang is co-editor of our <a href="https://lifesciences.mofo.com/" dir="ltr" target="_blank">MoFo Life Sciences Blog</a>.Wolfgang is a partner of Morrison Foerster based in our German office in Berlin.<h4 dir="ltr">Representative Transactional Matters</h4><ul dir="ltr"><li>U.S.-based BioTech fund on various research collaborations and other transactions with German start-ups or research institutions.</li><li>Negotiate multimillion-euro strategic partnership between two AgTech leaders concerning the development and commercialization of pest-resistant transgenic traits.</li><li>Craft global multi-million collaboration regarding AI-powered robotic MaaS.</li><li>UK-based digital health company on product roll-out of RPM applications in Germany; coordinate international expansion.</li><li>Advise numerous German start-ups on their U.S. expansion.</li><li>Draft diverse global patent and know-how license agreements in the areas of AgTech and life sciences—including gene licensing and licensing of genome editing technologies (e.g., CRISPR)—and medical devices; draft correlating supply and distribution agreements.</li><li>Structure IP rights in connection with joint ventures and other M&A transactions, including the carve-out of a patent-heavy semiconductor business comprising nine jurisdictions into a German–U.S. joint venture.</li><li dir="ltr">Advise on government-funded, multi-partner R&D projects and/or R&D projects with academic institutions, as well as on employee invention law.</li></ul><h4 dir="ltr">Representative Contentious IP Matters</h4><ul dir="ltr"><li>Lead counsel in an international dispute between software companies on rights and obligations following termination of a multi-million licensing and distribution arrangement; coordinate local counsel.</li><li>Defend Japanese chip manufacturer in high-profile SEP-litigation; advise on global settlement arrangement.</li><li>Represent leading internet retailer in patent infringement and concurrent invalidity proceedings in the context of a multijurisdictional dispute concerning touch-screen technology.</li><li>Represent diverse pharmaceutical and life sciences companies in national and cross-border patent infringement proceedings and other technology-related disputes, including preliminary injunctions as well as pre‑trial discovery and inspection proceedings, concerning, inter alia, drug-coating technologies, toner cartridges, medicinal gases, transgenic plants, and vaccines.</li><li dir="ltr">Conduct trademark, copyright, and false advertising litigation, including, most notably, a high-profile trademark litigation for a German bank, and a nine-country cross-border trademark litigation involving a famous pharmaceutical brand.</li></ul>

Dr. Wolfgang Schönig berät Mandanten zum Schutz des geistigen Eigentums sowohl in streitigen als auch nichtstreitigen Angelegenheiten, mit einem besonderen Fokus auf die IP-rechtliche Beratung von Unternehmen aus den Bereichen Life Sciences, Digitalwirtschaft und High-Tech.Zu seinen Beratungsschwerpunkten gehören Forschungs- und Entwicklungskooperationen, komplexe Lizenzvertragsgestaltungen und andereTechnologie-Transaktionen, sowie Know-how-Schutz-Strategien und das Arbeitnehmererfinderrecht. Er verfügt zudem über umfangreiche Prozesserfahrung zur Durchsetzung von Patenten, Marken- und anderen IP-Rechten, häufig auch in einem grenzüberschreitenden Kontext. Darüber hinaus bewertet Dr. Wolfgang Schönig zusammen mit seinem Team regelmäßig die Rechtskonformität von Werbekampagnen, prüft die Verfügbarkeit von Marken und entwickelt entsprechende Anmeldestrategien.Dr. Wolfgang Schönig ist Co-Editor des Life Sciences Blogs von Morrison Foerster.Er hat seinen Doktortitel an der Heinrich-Heine-Universität Düsseldorf und seinen LL.M. an der Fordham School of Law in New York erworben, jeweils mit Schwerpunkt im gewerblichen Rechtsschutz. Seinen MBA-Abschluss erhielt er von der European University in Barcelona.Dr. Wolfgang Schönig ist Partner des deutschen Büros von Morrison Foerster in Berlin.<h4 dir="ltr">Repräsentative Transaktionen</h4><ul><li dir="ltr">BioTech-Fonds mit Sitz in den USA bei verschiedenen Forschungskooperationen und anderen Transaktionen mit deutschen Start-ups oder Forschungseinrichtungen</li><li dir="ltr">Verhandlung einer hochvolumigen strategischen Partnerschaft zwischen zwei Technologieführern im Bereich Crop Science betreffend der Entwicklung und Kommerzialisierung von bestimmten Resistenzen</li><li dir="ltr">Gestaltung einer globalen Multi-Millionen-Zusammenarbeit für KI-gestützte Roboter</li><li dir="ltr">Ein in Großbritannien ansässiges Unternehmen für digitale Gesundheit bei der Markteinführung von RPM-Anwendungen in Deutschland; Koordination der internationalen Expansion</li><li dir="ltr">Beratung zahlreicher deutscher Start-ups bei deren US-Expansion</li><li dir="ltr">Strukturierung und Verhandlung diverser Patent- und Know-How-Lizenzen in den Bereichen Ag Tech und Life Sciences – einschließlich Fragen zu genome editing wie CRISPR-Medizingeräte, sowie Gestaltung von Softwarelizenzverträgen und Erstellung korrespondierender Liefer- und Vertriebsvereinbarungen</li><li dir="ltr">Strukturierung von IP-Rechten im Zusammenhang mit Joint Ventures und anderen M&A-Transaktionen, darunter die Koordination eines neun Länder umfassenden IP Carve-Outs im Rahmen eines Halbleiter-JVs</li><li dir="ltr">Beratung zu staatlich geförderten Multi-Partner F&E-Projekten und/oder F&E-Projekten mit akademischen Einrichtungen sowie zum Arbeitnehmererfindungsrecht</li></ul><h4 dir="ltr">Repräsentative IP-Streitigkeiten</h4><ul><li dir="ltr">Lead Counsel in einem internationalen Rechtsstreit zwischen Softwareunternehmen über Rechte und Pflichten nach Beendigung einer millionenschweren Lizenz- und Vertriebsvereinbarung; Koordinierung der lokalen Anwälte</li><li dir="ltr">Verteidigung eines japanischen Chipherstellers in einem prominenten Streitfall bezüglich Standardessentieller Patente (SEP); Beratung zu einer globalen Vergleichsregelung</li><li dir="ltr">Verteidigung einer führenden Internetplattform gegen Ansprüche eines Patenttrolls wegen vermeintlicher Verletzung von Patent bezüglich Touchscreen-Technologie sowie korrespondierende US-Streitigkeiten</li><li dir="ltr">Vertretung von Pharma- und Life Science-Unternehmen in nationalen und grenzüberschreitenden Patentverletzungsverfahren und anderen technologiebezogenen Streitigkeiten, einschließlich einstweiliger Verfügungsverfahren und vorprozessualer Beweissicherungs- und Besichtigungsverfahren, unter anderem in Bezug auf Arzneimittelbeschichtungstechnologien, Tonerkartuschen, medizinische Gase, transgene Pflanzen und Impfstoffe</li></ul>

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Wolfgang Schönig is a partner of Morrison Foerster (International) LLP based in our German office in Berlin. His practice specialty is advising on IP aspects relative to transactions in, among others, the life sciences, AgTech and pharmaceuticals industry, as well as legal representation in IP disputes. Wolfgang is specialized in research and development collaborations, complex licensing agreements, technology acquisitions, know-how protection strategies, and employee invention law.

Wolfgang Schönig focuses his practice on IP aspects relative to transactions in the digital, telecoms, high tech, life sciences, and pharmaceuticals industry, as well as legal representation in IP disputes.

Wolfgang Schönig advises clients on IP aspects relating to transactions in, among others, the life sciences, AgTech and pharmaceuticals industry, as well as legal representation in IP disputes. His additional focus areas include research and development collaborations, complex licensing agreements, technology acquisitions, know-how protection strategies, and employee invention law.

Wolfgang Schönig

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Patent-Eligibility Considerations & Prosecution Strategies for AI-Based Life Sciences Patent Applications

AI Transparency in Healthcare: Navigating a Changing Regulatory Landscape

Recentive: Raising the Patent-Eligibility Bar in AI-Related Inventions

April 2025 Update on Regulation of New Genomic Techniques in the EU

In Patent Prosecution, You Have the Right to Remain Silent. Anything You Say Can and Will Be Used Against You in the Court of Law

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In a recent decision, Ajinomoto v. ITC, the Federal Circuit addressed the issues of doctrine of equivalents and prosecution history estoppel as applied to patent claims reciting specific amino acid sequence of a biologic. On appeal, the Federal Circuit affirmed the decision by the United States International Trade Commission that a protein having 85% to 95% identity infringed a claim reciting specific amino acid sequences under the doctrine of equivalents.The doctrine of equivalents is used to find infringement of products or processes that do not fall within the literal scope of patent claims. The function-way-result test is frequently used to determine equivalents.[1] Prosecution history estoppel limits the reach of equivalents based on claim amendments during prosecution of a patent. Specifically, a narrowing amendment gives rise to the presumption that the territory between the original claim and the amended claim has been surrendered. This presumption can be rebutted, however, if 1) the equivalent was unforeseeable at the time of amendment; 2) the rationale underlying the amendment bears no more than a tangential relationship to the equivalent in question; or 3) there is some other reason suggesting that the patentee could not reasonably be expected to have claimed the equivalent. [2]The Ajinomoto case involved an unusual file history. During prosecution of the asserted patent, Ajinomoto presented a claim that recited two alternatives for the claimed protein:(A) a protein that comprises the amino acid sequence of SEQ ID NO:2; or(B) a protein that comprises an amino acid sequence including deletion, substitution, insertion, or addition of one or several amino acids in the amino acid sequence shown in SEQ ID NO:2.SEQ ID NO:2 corresponds to the amino acid sequence of the E. Coli YddG protein. Facing anticipatory prior art which disclosed an E. Coli protein with a similar sequence, Ajinomoto kept alternative (A) and replaced alternative (B) with “a protein which comprises an amino acid sequence that is encoded by a nucleotide sequence that hybridizes with the nucleotide sequence of SEQ ID NO:1 under stringent conditions.” Ultimately, claims 9 and 15 issued, each reciting one of the alternatives. The asserted claim (claim 20) depends from both claims and recites:A method for producing an aromatic L-amino acid, which comprises cultivating the bacterium according to any one of claims 9-12, 13, 14, 15-18, or 19.The accused bacterial strain expressed a codon-randomized non-E. Coli YddG gene that codes for a protein having 85% – 95% identity with the amino acid sequence of SEQ ID NO:2.[3] The issue before the Court was whether the accused bacterial strain met the protein limitation (A) under the doctrine of equivalents.Although a narrowing claim amendment was made during prosecution, the Court held that prosecution history estoppel did not preclude a finding of equivalents. The Court reasoned that prosecution history applies under unusual circumstances, because the infringement determination rested on finding equivalents of the protein limitation (A), which was not altered during prosecution.[4] The Court found that the amendment to the claim limitation (B) bore no more than a tangential relationship to the accused product because “the objectively evident rationale for the amendment was to limit the set of proteins within the claim’s scope so that it no longer included the prior art E. Coli YfiK protein and, more generally, no longer allowed as wide a range of amino acid alterations. The reason for the amendment had nothing to do with choosing among several DNA sequences in the redundant genetic code that correspond to the same protein.”[5]The Federal Circuit then applied the function-way-result test set forth by the Supreme Court in Graver Tank to determine equivalents.[6] The Federal Circuit found that the accused equivalent performed the same function, namely exporting aromatic L-amino acids out of bacterial cells. The Court found that the accused equivalent performed the function in the same way because the equivalent had 85 – 95% identity with the sequence recited in the claim. The Court further determined that the recited protein and the accused equivalent produced the same result of increasing the ability of the bacteria to produce and accumulate L-tryptophan. The Court consequently concluded that the accused strain infringed the asserted claim under the doctrine of equivalents.Judge Dyk, in dissent, disagreed with the majority’s prosecution history estoppel analysis. In Judge Dyk’s view, the equivalent was directly related to the reason for the claim amendment, namely to exclude those proteins made by an encoding nucleotide that does not hybridize with SEQ ID NO:1.[7]The Ajinomoto decision sheds light on how patents reciting specific sequences of a biologic are analyzed under the existing prosecution history estoppel and doctrine of equivalents frameworks. However, many questions remain unanswered. For example, as noted by the decision, this was an unusual case where the amendment that may have given rise to prosecution history estoppel was not made with respect to the particular limitation at issue. It is unclear whether similar reasoning would apply if the original claim did not list the protein and its variants as alternatives on separate tracks and/or if the narrowing amendment were made to the limitation at issue.The doctrine of equivalents and prosecution history estoppel involve fact-intensive inquiries and detailed analysis of the prosecution history of a patent. Practitioners analyzing infringement of biologics on a patent should go beyond the claimed sequences and consider whether related proteins or nucleic acids may be infringing under the doctrine of equivalents, even if the claims are narrowed during prosecution. In addition, patent applicants should consider the option of starting prosecution with narrow claims when prosecuting a biologics patent application to limit potential prosecution history estoppel arguments down the line during litigation.[1]Graver Tank v. Linde Air Products, 339 U.S. 605, 608 (1950).[2] Festo v. Shoketsu Kinzoku Kogyo Kabushiki, 535 U.S. 722, 740 (2002).[3] Although it is unclear from the opinion, it appears that the Court may be referring to 85% identity with respect to predicted secondary structure based upon the reference cited in the opinion.  [4] Ajinomoto V. ITC, Federal Circuit (2018-1590, 2018-1629), slip opinion at p. 18.[5] Slip opinion at p. 21.[6] Graver Tank at 608.[7] Slip opinion Dissent at p. 7.

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Janet focuses her practice on worldwide patent procurement, patent portfolio management, and strategic planning for life sciences companies. Janet’s clients range from large multinational biopharmaceu

Janet Xiao Ph.D.

Janet focuses her practice on worldwide patent procurement, patent portfolio management, and strategic planning for life sciences companies. Janet’s clients range from large multinational biopharmaceutical companies, such as Celgene and Genentech, to emerging startup companies around the world.

Janet Xiao

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Analyzing Biologics Under the Doctrine of Equivalents and Prosecution History Estoppel

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In a recent decision, Ajinomoto v. ITC, the Federal Circuit addressed the issues of doctrine of equivalents and prosecution history estoppel as applied to paten

Analyzing Biologics Under the Doctrine of Equivalents and Prosecution History Estoppel

On July 3, 2019, in a 7-5 en banc decision, the Federal Circuit declined to reconsider its decision in Athena Diagnostics v. Mayo Collaborative Services,[1] finding that claims to a diagnostic method were patent ineligible for being directed to a law of nature. The claims on review recited a method of diagnosing disorders related to muscle specific tyrosine kinase (MuSK) by detecting autoantibodies to an epitope of MuSK. The majority of the panel generally felt confined by the Supreme Court’s decision in Mayo Collaborative Services v. Prometheus Laboratories setting forth a two-step framework for determining whether claims are patent eligible. [Summarized here [<a target="_blank" href="https://lifesciences.mofo.com/topics/securing-and-protecting-diagnostic-based-claims.html">5/30 Blog Post</a>]] Although the Federal Circuit will not re-hear the matter, the en banc decision uniquely lays out eight separate opinions acknowledging the problems of the current patent eligibility jurisprudence, and requests that the Supreme Court or Congress take action. The separate opinions include the following notable dicta:Judge Lourie (concurring, joined by Judge Reyna and Judge Chen)“If I could write on a clean slate, I would write as an exception to patent eligibility, as respects natural laws, only claims directed to the natural law itself, e.g., E=mc2, F=ma, Boyle’s Law, Maxwell’s Equations, etc. I would not exclude uses or detection of natural laws. The laws of anticipation, obviousness, indefiniteness, and written description provide other filters to determine what is patentable.”Judge Hughes (concurring, joined by Judge Prost and Judge Taranto)“I, for one, would welcome further explication of eligibility standards in the area of diagnostics patents. Such standards could permit patenting of essential life saving inventions based on natural laws while providing a reasonable and measured way to differentiate between overly broad patents claiming natural laws and truly worthy specific applications.”Judge Dyk (concurring, joined by Judge Hughes and Judge Chen)“Thus, it would be desirable for the Supreme Court to refine the Mayo framework to allow for sufficiently specific diagnostic patent claims with proven utility. In the life sciences, development of new diagnostic methods is often based on researching complex biological systems. The inventive concepts in this area may lie primarily in the application of a natural law.”Judge Chen (concurring)“New methods for diagnosing medical conditions, as a general matter, intuitively seem to be the kind of subject matter the patent system is designed for: to encourage the risky, expensive, unpredictable technical research and development that people would not otherwise pursue in the hope that if they discover something of great medical value, then they will be protected and rewarded for that successful effort with a patent.”Judge Moore (dissenting, joined by Judge O’Malley, Judge Wallach, and Judge Stoll)“This is not a case in which the judges of this court disagree over whether diagnostic claims, like those at issue in Athena, should be eligible for patent protection. They should. None of my colleagues defend the conclusion that claims to diagnostic kits and diagnostic techniques, like those at issue, should be ineligible.”Judge Newman (dissenting, joined by Wallach)“Athena’s diagnostic method is not a law of nature; it is a novel man-made method of diagnosis of a neurological disorder. The Athena diagnostic method, a multi-step method performed by a combination of specific chemical and biological steps, was unknown in the prior art. The Court in Mayo did not exclude such methods from eligibility for patenting.”Judge Stoll (dissenting, joined by Wallach)“Interpreting Mayo, our prior opinions seem to take for granted that the Supreme Court has foreclosed all avenues of patent protection for diagnostic claims…Our inflexible following of Mayo has created flawed decisions that are inconsistent with the precepts of Mayo and our patent system as a whole.”Judge O’Malley (dissenting)“I believe that confusion and disagreements over patent eligibility have been engendered by the fact that the Supreme Court has ignored Congress’s direction to the courts to apply 35 U.S.C. sections 101, et seq. (“Patent Act”) as written. Specifically, the Supreme Court has instructed federal courts to read into Section 101 an “inventive concept” requirement—a baffling standard that Congress removed when it amended the Patent Act in 1952.”This dicta is promising and may signify the real possibility of change (and certainty) to patent eligibility standards in the diagnostics field.  Although it remains to be seen if Athena will file a petition for certiorari review with the Supreme Court, either the Supreme Court or Congress has been given a call to action.The en banc decision can be viewed <a target="_blank" href="http://www.cafc.uscourts.gov/sites/default/files/opinions-orders/17-2508.Order.7-3-2019.1.pdf">here</a>. [1] Athena Diagnostics, Inc. v. Mayo Collaborative Servs., LLC, 915 F.3d 743 (Fed. Cir. 2019).

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Karen Potter is a partner in Morrison & Foerster’s Life Sciences Patent group. Her practice focuses on patent preparation, prosecution, and strategic counseling for start‑up, emerging, and established

Karen G Potter Ph.D.

Karen Potter

Federal Circuit Diagnoses the Patent Eligibility Problem – But Denies a Remedy

On July 3, 2019, in a 7-5 en banc decision, the Federal Circuit declined to reconsider its decision in Athena Diagnostics v. Mayo Collaborative Services,[1] fin

Federal Circuit Diagnoses the Patent Eligibility Problem – But Denies a Remedy

The United States Supreme Court finally clarified its 11-year-old “clear evidence” standard for pharmaceutical preemption.  In its much-anticipated opinion delivered by Justice Breyer, the Court unanimously reversed the Third Circuit’s holding that questions of pharmaceutical preemption should be decided by juries.  Merck Sharp & Dohme Corp. v. Albrecht et al., No. 17-290, slip op. (U.S. May 20, 2019) (“Albrecht”).  However, those who had criticized the Third Circuit’s opinion were left wanting more—the limited holding does not reach the issue of whether plaintiffs’ claims against the manufacturer were preempted.BackgroundOver 500 patients sued Merck alleging they suffered atypical femoral fractures, a rare type of stress fracture affecting the thigh bone, after using Merck’s Fosamax drug.  They claimed that Merck failed to disclose these risks on the drug label.  Merck countered that FDA had rejected or would have rejected its proposed addition to the drug label.  As a result, Merck said it could not comply with both federal drug labeling requirements and its duty to warn under state law.  In these circumstances, Merck argued, the federal law and regulations preempt the patients’ state‑law claims such that Merck should not be held liable for failing to disclose the stress fracture risks to consumers.Merck based its argument on years of back-and-forth discussions with FDA about whether Fosamax could cause these types of stress fractures.  In 1995, when FDA first approved Fosamax, the label did not include the fracture warning because—at that time—the risk was still theoretical.  After more than a decade of post-market surveillance, Merck sought preapproval to add these risks to its Fosamax label in 2008.  FDA rejected Merck’s proposed change.  Not until 2011 did FDA agree to add language to the Fosamax label disclosing the risks of atypical femoral fractures.Beginning in 2010, hundreds of patients filed lawsuits that were eventually consolidated in a multidistrict litigation in the District of New Jersey.  The district court granted Merck’s summary judgment motion on the ground that the patients’ state-law failure to warn claims were preempted by federal law.  The Third Circuit reversed, finding that the preemption question involved factual disputes the jury should have resolved and that Merck needed more evidence to meet the “clear evidence” standard set forth in Wyeth v. Levine to establish its preemption defense.Defining Wyeth’s “Clear Evidence” StandardIn 2009, the Supreme Court issued the first of several important pharmaceutical preemption decisions in Wyeth v. Levine, 555 U.S. 555 (2009).  There, a Vermont jury found that Wyeth failed to provide an adequate warning that direct injection of its Phenergan drug created a significant risk of harm to patients.  The Vermont Supreme Court agreed, finding no preemption.The U.S. Supreme Court affirmed.  In doing so, the Court explained that unless a drug manufacturer can show “clear evidence” that FDA would not have approved a change to its drug label, a court cannot conclude that it was impossible for the drug manufacturer to comply with both federal drug labeling requirements and state-law duty to warn requirements.  In other words, to succeed on this type of impossibility preemption defense, a drug manufacturer has to provide clear evidence that FDA considered the risk and made an affirmative decision to either (a) not change the label or (b) prohibit the manufacturer from strengthening its warning.However, what constituted “clear evidence” under Wyeth remained unclear until now.  Post-Wyeth, courts have struggled to apply the undefined clear evidence standard to determine if the FDA would have rejected a proposed warning change that was never submitted.In Albrecht, Merck had sought preapproval from FDA to strengthen Fosamax’s warnings, but that proposal was rejected.  When Fosamax users brought state-law failure-to-warn claims, Merck argued that the claims were preempted by federal law because the FDA had rejected Merck’s proposed changes to the Fosamax label.The Court clarified that “clear evidence” means “evidence that shows the court that the drug manufacturer fully informed the FDA of the justifications for the warning required by state law and that the FDA, in turn, informed the drug manufacturer that the FDA would not approve a change to the drug’s label to include that warning.”  This definition dispels the notion that the “clear evidence” standard is an evidentiary standard, as some district courts had interpreted it to be.But whether the FDA’s action in Albrecht satisfies the standard is left open.  The Court did not actually reach the preemption question.Preemption Questions Must Be Decided by the JudgeNext, the Court held that judges, not juries, must decide the question of whether state-law failure-to-warn claims are preempted by the Federal Food, Drug, and Cosmetic Act and related labeling regulations.  This includes whether there is clear evidence that FDA would not have approved the warning that state law requires.  The Court reasoned that resolving questions of agency disapproval often requires legal skills to understand an agency decision within the applicable regulatory framework.  The Court acknowledged that the preemption issue typically involves factual disputes but that these factual questions are “subsumed within an already tightly circumscribed legal analysis.”Key Takeaways<ul><li>Justice Thomas joined the opinion but wrote separately to say that Merck’s preemption defense failed. Why?  Because Merck relied on FDA response letters as evidence that Merck could not have strengthened its warning.  According to Justice Thomas, an FDA response letter cannot have preemptive effect because it is “not a final agency action with the force of law.”  His concurrence is surprising given that he wrote the majority opinion in PLIVA, Inc. v. Mensing, 131 S. Ct. 2567 (2011), holding that certain generic pharmaceutical failure-to-warn claims are preempted.</li><li>Justice Alito, joined by Justices Roberts and Kavanaugh, also wrote separately. He would have found preemption here and suggested that the Third Circuit should find “clear evidence” that the FDA would not have approved Merck’s label.  Justice Alito cited the record showing that FDA was deeply involved in the stress fracture issue for years, and that the agency has a statutory duty to require label changes upon learning new evidence warranting a change.  Under these circumstances, Justices Alito, Roberts, and Kavanaugh would have found preemption.</li><li>Defendants should welcome this clarity on the “clear evidence” standard, which relieves them of the confusing pseudo-evidentiary burden that some lower courts had applied.</li><li>Although the opinion may disappoint by not reaching the preemption question, Justice Alito’s concurrence provides drug manufacturers a roadmap for satisfying the “clear evidence” standard.</li><li>Given the favorable—albeit limited—holding, defendants should feel emboldened to assert a federal preemption defense in other areas beyond pharmaceuticals.</li></ul>

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Co-Chair, Litigation Department

Erin Bosman is the global co-chair of Morrison Foerster’s litigation department. Erin is also the founder and co-head of the Artificial Intelligence group and former chair of the Complex Litigation + Advisement practice group. Clients value her business strategy, seeking her comprehensive counsel throughout the product life cycle, especially in high-stakes litigation and product recalls.

Erin M. Bosman

Erin Bosman is the Global Co-Chair of Morrison Foerster’s Litigation Department. Erin is also the founder and co-head of the Artificial Intelligence Group and former chair of the Complex Litigation + Advisement Practice Group. Clients value her business strategy, seeking her comprehensive counsel throughout the product life cycle, especially in high-stakes litigation and product recalls.

Erin Bosman

An orthopedic implant company

A children&rsquo;s monthly subscription service product

A fertility company

A major technology company

A smart fitness equipment company

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Julie Park provides analytic and strategic counsel for issues in product life cycle, product liability and defective products, consumer class actions, and more.

Julie Park | Product Liability Lawyer

Julie Y. Park

Supreme Court Decides Prescription Drug Preemption Case in Favor of Drug Manufacturer