Biosimilars Update -- Pfizer's Proposed Epogen®/Procrit® Biosimilar Recommended for Approval

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On May 25, 2017, the FDA's Oncologic Drug Advisory Committee recommended approval of biologics license application ("BLA") 125545 submitted by Hospira Inc., a Pfizer company, for Retacrit, a proposed biosimilar to Amgen Inc.'s Epogen/Procrit (epoetin alfa).  According to a press release from Pfizer, the committee "recommended approval of the Company's proposed epoetin alfa biosimilar across all indications."  Pfizer had sought approval for treatment of anemia due to Chronic Kidney Disease (CKD), for treatment of anemia due to zidovudine in HIV-infective patients, for treatment of anemia in patients with non-myeloid malignancies, and to reduce the need for allogenic RBC transfusions among patients with perioperative hemoglobin.  If ultimately approved, Retacrit would become the sixth biosimilar in the U.S.  And if the experience with the previous five biosimilars is any indication, the FDA should be expected to approve the present application in the next couple of months.  Retacrit would also be the second biosimilar for Pfizer, which began selling Celltrion's biosimilar INFLECTRA® in late 2016.  As Pfizer's representative Diem Nguyen said in the press release:  "Following the approval and launch of INFLECTRA® (infliximab-dyyb) in 2016, this positive recommendation -- a first for a proposed ESA [erythropoiesis-stimulating agent] biosimilar -- marks an important milestone for Pfizer's U.S. biosimilars portfolio."

The Retacrit application would also represent the longest delay between submission and approval.  BLA 125545 was originally submitted in December 2014, and according to a Complaint filed by Amgen in September 2015, the application was accepted sometime on or before February 23, 2015.  But on October 27, 2015, Pfizer announced that it had received a complete response letter (CRL) from the FDA that required more evidence to support approval.  According to Pfizer's FDA Advisory Committee Briefing Document, the CRL "requested additional data and sensitivity analysis to align with the most current FDA expectations and to ensure the robustness of the data demonstrating biosimilarity of Epoetin Hospira to the Epogen/Procrit reference product."  This included information in the categories of:  manufacturing process, analytical, clinical pharmacology, clinical efficacy, and clinical immunogenicity.  In response, Pfizer obtained the additional scientific evidence, which it summarized in the following figure that it said "establishes the biosimilarity of Epoetin Hospira to the Epogen/Procrit reference product."

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Marketing of the drug will likely be delayed because of the requirement to give the 180-day notice of commercial marketing.  In anticipation, though, Amgen filed a motion for preliminary injunction on May 26, 2017, because (as it alleged in the original underlying Complaint (at paragraph 66)):  "Hospira has indicated that it intends to violate the statute by categorically refusing to provide Amgen with a legally operative notice of commercial marking under 42 U.S.C. § 262(l)(8)(A)."  Of course, according to the Federal Circuit's Amgen v. Sandoz ruling, Hospira cannot give notice until after the FDA has approved the product.  But this requirement may change this month when the Supreme Court issues its decision in the Sandoz v. Amgen case.  The Delaware Court also denied Amgen's request for discovery related to Hospira's manufacturing process that was not supplied during the patent dance.  The appeal from that decision was heard by the Federal Circuit in April 2017, and an opinion is expected within the next few months.

As a reminder, both this author and Kevin Noonan will be attending the American Conference Institute's 8th Annual Summit on Biosimilars next week, June 12-14, 2017 in New York, NY.  Dr. Noonan is co-chair of the conference and will be on a panel reviewing the first 18 months of biosimilars (and looking ahead).  If you are attending, please say hello.  As a reminder, Patent Docs readers are entitled to a 10% discount off of registration using discount code P10-999-PTD17, but hurry because registration is closing soon.

DISCLAIMER: Because of the generality of this update, the information provided herein may not be applicable in all situations and should not be acted upon without specific legal advice based on particular situations.

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