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Last month, the US Food and Drug Administration (FDA) published final guidance designed to help sponsors identify appropriate supplement categories for biosimilar prior approval supplements. The guidance establishes six distinct categories and outlines the agency's review goals for each, fulfilling a commitment made in the Biosimilar User Fee Amendments of 2022 (BsUFA III) commitment letter.
The finalized document replaces a draft version issued in August 2023 and incorporates revisions based on industry feedback. The guidance aims to create consistent review processes for both original and resubmitted biosimilar prior approval supplements.
The FDA's guidance delineates six categories of prior approval supplements (PAS), each addressing different types of changes to biosimilar products:
Category A supplements cover straightforward changes that incorporate safety labeling updates for biosimilar or interchangeable biosimilar products. This category represents the most routine modifications to product information.
Category B applies to supplements seeking additional indications that involve submission of analytical in vitro data collected through physical, chemical, or biological assays. This category requires supporting analytical evidence for the proposed indication.
Category C supplements address the removal of indications from approved products. Applicants must provide information necessary to support the proposed labeling change, even when removing rather than adding information.
Category D encompasses supplements seeking to add an indication to a licensed biosimilar or interchangeable biosimilar product. This category represents a standard pathway for indication expansion.
Category E applies to biologics license application (BLA) supplements for licensed biosimilar or interchangeable biosimilar products seeking licensure for additional indications previously approved for the reference product, where the submission contains efficacy data. This category requires more substantial clinical evidence.
Category F supplements specifically address interchangeable products, representing a distinct regulatory pathway for products that meet interchangeability standards.
The FDA noted several modifications between the draft and final versions of the guidance. The final document clarifies that recommendations do not include manufacturing-only supplements or all supplements for safety-related labeling updates. This specification helps sponsors understand the scope and limitations of the guidance.
The final version also clarifies that applicants can request reconsideration of their classification category assignment with appropriate justification. According to the updated text, "if an applicant does not agree with FDA's classification category assignment, it may submit a response with updated justifications for its proposal for FDA's consideration." This revision addresses a request from the Association for Accessible Medicines (AAM).
Additional clarification states that a pediatric assessment or amended initial pediatric study plan may be included in Category D supplements. The FDA also made editorial changes throughout the document to improve overall clarity.
Responding to industry feedback, the final guidance includes a list of existing guidelines that address supplements falling outside Categories A through F. This addition came at the request of AAM.
The referenced guidelines include the International Council on Harmonization's (ICH) guidance for industry Q5E "Comparability of Biotechnological/Biological Products Subject to Changes in Their Manufacturing Process" from June 2005. The list also cites "Changes to an Approved Application for Specified Biotechnology and Specified Synthetic Biological Products" issued in July 1997.
Additional references include "Comparability Protocols for Postapproval Changes to the Chemistry, Manufacturing, and Controls Information in an NDA, ANDA, or BLA," published in October 2022, and "CMC Postapproval Manufacturing Changes for Specified Biological Products To Be Documented in Annual Reports," issued in December 2021.
The Biosimilars Forum submitted comments expressing concern about the timelines for acknowledgment letters. The organization requested acknowledgment letters within 60 days for Category A-D supplements, noting that the current timeline falls outside the standard timeframes established by the FDA for other supplement and application acknowledgment letters.
The Biosimilars Forum stated: "We are concerned by the timelines given here and in the BsUFA III Commitment letter for the following reasons: Receiving an acknowledgement letter for Category A-D supplements within 60 days is outside the standard timeframes set forth by FDA for other supplement and application acknowledgement letters."
The organization urged the FDA to commit to sending acknowledgment letters sooner, noting that delays in receiving confirmation of supplement classification and review timelines could affect other changes planned by applicants. The FDA rejected this specific request in the final guidance.
The guidance provides sponsors with a structured framework for understanding how their supplement submissions will be classified and reviewed. This standardization may help companies plan development timelines and regulatory strategies more effectively.
The establishment of clear categories also provides transparency regarding the FDA's expectations for different types of supplement submissions. Companies can use this information to prepare appropriate supporting data and documentation for their specific supplement type.
The acknowledgment that applicants can request reconsideration of classification assignments introduces flexibility into the process, though the practical implications of this provision will depend on how frequently the FDA accepts alternative classifications.
The guidance's publication fulfills a commitment outlined in the BsUFA III commitment letter, demonstrating the FDA's progress on developing the biosimilar regulatory framework. The document represents part of ongoing efforts to create clear, consistent pathways for biosimilar product development and approval.
Industry stakeholders will likely continue monitoring how the FDA implements these categories in practice and whether review timelines align with the goals outlined in the guidance. Future revisions may address timeline concerns or other implementation issues that emerge as sponsors submit supplements under the new framework.
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