On October 29, 2021, Hope Medical Enterprises, Inc. (“Hope”) filed a Petition for inter partes review (IPR2022-00125) to invalidate our wholly owned U.S. Patent No. 10,792,363 (the “’363 Patent”), which relates to an anhydrous form of STS and its method of manufacture, which is the active pharmaceutical ingredient in the PEDMARK® product. The ‘363 Patent was issued on October 6, 2020. In May 2022, the PTAB granted Hope’s Petition to Institute the IPR against the ‘363 patent. During the ‘363 IPR, we disclaimed the patent claims directed to the anhydrous morphic form of STS and continued with claims directed to its method of manufacture. Because the remaining claims in the ‘363 patent are directed to a method of manufacture, the ‘363 patent is not eligible for listing in the Orange Book. On December 14, 2022, we filed a Revised Motion to Amend the remaining claims in the ‘363 Patent. In April 2023, the PTAB extended the time for a decision on the ‘363 Patent IPR up to an additional 6 months, or November 2023, after which the decision can be reconsidered and/or appealed by the losing party.
The USPTO has now granted three additional U.S. patents that cover the PEDMARK® formulation, each of which have been listed in the U.S. FDA’s “Orange Book” (U.S. Patent No. 11,291,728 (issued April 5, 2022), U.S. Patent No. 11,510,984 (issued November 29, 2022), and U.S. Patent No. 11,617,794 (issued April 4, 2023)), and additional United States patent applications from this family remain pending at the USPTO. We plan to vigorously defend our intellectual property rights to PEDMARK®. An invalidation of our patents covering PEDMARK® could have a material adverse effect on our ability to protect our rights in PEDMARK® beyond periods of marketing exclusivity for PEDMARK® in the United States under Orphan Drug Designation.
CIPLA ANDA Litigation
On December 1, 2022, we received a letter dated November 30, 2022, notifying us that CIPLA Ltd. and CIPLA USA (“CIPLA”) submitted to the FDA an ANDA (ANDA No. 218028) for a generic version of PEDMARK® (sodium thiosulfate solution) that contains Paragraph IV Certifications on two of our patents covering PEDMARK®: the OHSU licensed ‘190 Patent, expiration date January 2038; and our US 11,291,728 Patent (the “’728 Patent”), expiration date July 2039. On January 6, 2023, we received a letter dated January 5, 2023, notifying us that CIPLA submitted to the FDA a Paragraph IV Certification on our newly issued US 11,510,984 Patent (the “’984 Patent”). These patents are listed in FDA’s list of Approved Drug Products with Therapeutic Equivalence Evaluations, commonly referred to as the Orange Book, for PEDMARK®. The certifications allege these patents are invalid or will not be infringed by the manufacture, use, or sale of CIPLA’s sodium thiosulfate solution.
Under the Food and Drug Cosmetic Act, as amended by the Drug Price Competition and Patent Term Restoration Act of 1984, as amended, after receipt of a valid Paragraph IV notice, the Company may bring a patent infringement suit in a federal district court against CIPLA within 45 days from the receipt of the Notice Letter and if such a suit is commenced within the 45-day period, the Company is entitled to a 30 month stay on the FDA’s ability to give final approval to any proposed products that reference PEDMARK®. In addition to the 30-month stay, because we have received Orphan Drug Exclusivity, the FDA may not approve CIPLA’s ANDA for at least 7 years from PEDMARK®’s FDA approval date of September 20, 2022.
On January 10, 2023, we filed suit against the CIPLA entities in the United States District Court for the District of New Jersey (Case No. 2:23-cv-00123), for infringement of the ‘190 Patent, the ‘728 Patent, and the ‘984 Patent. On April 20, 2023, we filed an Amended Complaint to only assert infringement of the ‘728 patent and the ‘984 Patent. On April 4, 2023, we were granted US 11,617,793 Patent (the “’793 Patent”) covering the formulation of the PEDMARK® product, which was listed in the Orange Book on or around April 17, 2023, and has an expiration date of July 2039. On May 11, 2023, we received written notice of CIPLA’s Paragraph IV Certification as to the ’793 Patent, which was dated May 10, 2023, along with an enclosed statement of alleged factual and legal bases for stating that the ’793 Patent is invalid, unenforceable, and/or will not be infringed by CIPLA’s ANDA Product. On July 27, 2023, we filed a Second Amended Complaint to assert the ‘793 Patent. The suit is ongoing.
PEDMARQSI (EU Brand name for PEDMARK) received European Commission approval in June 2023 and was granted 10 years of market exclusivity in Europe under Pediatric Use (“PUMA”).