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Court Says FDA Unlawfully Infringed on Catalyst Orphan Drug Exclusivity with Ruzurgi Approval

Court Says FDA Unlawfully Infringed on Catalyst Orphan Drug Exclusivity with Ruzurgi Approval

A Washington D.C. circuit appellate court has ruled that FDA violated the Orphan Drug Act and unlawfully infringed on Catalyst Pharmaceuticals Inc.’s orphan drug exclusivity period when it approved another company’s drug - the same drug to be used in treating the same disease.

The September 30 court ruling in Catalyst v. FDA reversed a previous Florida district court decision which upheld FDA’s claim that the “same disease or condition” language in the Orphan Drug Act is ambiguous and can be interpreted as meaning “same indication or use.”

The appellate court found that FDA’s interpretation of the term was “not in accordance with law, and its approval of Ruzurgi must be set aside.”

FDA Approves Jacobus’ Amifampridine, Overlapping Catalyst’s Exclusivity Period

In November 2009, FDA granted orphan drug designation to Catalyst Pharmaceuticals, Inc.’s Firdapse (amifampridine) for treating the rare, potentially fatal neuromuscular disorder known as Lambert-Eaton myasthenic syndrome (LEMS) – a disorder with an estimated 950 to 1,300 diagnosed U.S. cases.

Nine years later, FDA approved Catalyst’s new drug application for Firdapse (amifampridine) to treat LEMS in adult patients only.

Under the Orphan Drug Act, orphan drug sponsors are granted a seven-year exclusivity period following FDA approval, during which time the FDA cannot approve any subsequent application for "the same drug for the same disease or condition." Catalyst’s seven years of orphan drug exclusivity for Firdapse expires in November 2025.

But in May 2019, FDA approved a pediatric version of amifampridine for LEMS treatment. Jacobus Pharmaceutical Company, Inc. received FDA approval for Ruzurgi to treat LEMS patients ages six through sixteen.

In response, Catalyst sued FDA, arguing that it had violated the Orphan Drug Act’s “same disease or condition” clause in approving Ruzurgi – same drug, same disease.

FDA argued that approving Ruzurgi for pediatric LEMS treatment did not encroach on Catalyst’s Firdapse exclusivity for treatment of adults because the indications differed.

Originally, the Florida district court held that Orphan Drug Act is unclear whether the term “same disease or condition” refers to the drug’s approved use. Therefore, under the Chevron-deference doctrine, FDA could interpret the meaning itself. The court ruled FDA’s interpretation of the phrase as meaning “same indication or use” was reasonable and FDA did not err in approving Ruzurgi.

Appeals Court Says FDA Must “Set Aside” Approval of Ruzurgi

In Catalyst’s appeal, the Eleventh Circuit found that the phrase “same disease or condition” is not ambiguous. It means what it says. All parties involved in the dispute (FDA, Catalyst, Jacobus) agreed that LEMS is the disease and amifampridine is the drug. The court defined the word “same” as “the one under discussion or already referred to,” concluding that pediatric and adult LEMS are the same disease and that FDA cannot interpret “same disease or condition” as meaning “same indication or use.”

“[I]f Congress wanted to make the ‘use or indication’ inquiry relevant to a holder’s market exclusivity for an orphan drug, it could have done so by including such language in § 360cc(a),” the Court stated in its analysis. “The fact that Congress did not include that language counsels against an interpretation that finds an ambiguity in § 360cc(a)’s language.”

The Eleventh Circuit Appeals Court held that the District Court erred in finding the phrase ambiguous, reversing the District Court’s decision, and granting Catalyst’s Motion for Summary Judgement.

“Because it is undisputed that none of the statutory exceptions to Catalyst’s market exclusivity apply, the FDA was prohibited from approving for sale the same drug manufactured by Jacobus Pharmaceutical Company, Inc., to treat the same autoimmune disease during the period of Catalyst’s market exclusivity,” the court concluded. “As a result, the FDA’s agency’s action was arbitrary, capricious, and not in accordance with law, and its approval of Ruzurgi must be set aside.”

What Catalyst v. FDA Means for Drug Sponsors

The seven-year exclusivity period for FDA-approved orphan drugs is one of the only incentives to develop drugs for rare diseases. Without it, drug makers would pursue more profitable ventures with larger patient populations.

What the Eleventh Circuit’s decision means for the future of orphan drug exclusivity remains to be seen. It may prompt FDA to require NDA and ANDA applicants to narrow their disease descriptions, preventing future applicants from obtaining blanket approval for a rare disease, instead requiring them to specify disease stages or patients who have received certain prior therapies.

This is particularly problematic for rare disease populations, lessening the incentive for drug developers, oversaturating the market, or allowing orphan drug exclusivity for drugs that would otherwise not meet the rare disease requirement.

FDA has been criticized for allowing “serial exclusivity” involving orphan drugs, granting companies multiple consecutive 7-year exclusivity periods for the same drug and same disease with a slightly different disease stage or indication (Ibrutinib, Bevacizumab, Bortezomib).

With the Eleventh Circuit’s decision, NDA and ANDA applicants could start challenging these serial approvals, claiming FDA is unlawfully granting subsequent approval for the same drug and same disease and therefore allowing a single company to corner the market and block cheaper generics.

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Gregory J. Glover MD JD is a patent attorney and non-practicing physician. A noted expert on developments and emerging conflicts in the pharmaceutical industry, Greg is an expert on regulatory IP issues.



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