USA – Guidance : Quality Considerations in Demonstrating Biosimilarity of a Therapeutic Protein Product to a Reference Product

This guidance describes the Agency’s current thinking on factors to consider when
demonstrating that a proposed therapeutic protein product (hereinafter proposed product or proposed biosimilar product) is highly similar to a reference product licensed under section 351(a) of the Public Health Service Act (PHS Act) for the purpose of submitting a marketing application under section 351(k) of the PHS Act. Specifically, this guidance is intended to provide recommendations to sponsors on the scientific and technical information for the chemistry, manufacturing, and controls (CMC) section of a marketing application for a proposed product submitted under section 351(k) of the PHS Act.

The Biologics Price Competition and Innovation Act of 2009 (BPCI Act) amends the PHS Act
and other statutes to create an abbreviated licensure pathway in section 351(k) of the PHS Act for biological products shown to be biosimilar to or interchangeable with an FDA-licensed biological reference product (see sections 7001 through 7003 of the Patient Protection and Affordable Care Act (Affordable Care Act) (Public Law 111-148). The BPCI Act also amended the definition of biological products to include “protein (except any chemically synthesized polypeptide).” A 351(k) application for a proposed biosimilar product must include information demonstrating biosimilarity, based on data derived from, among other things, “analytical studies that demonstrate that the biological product is highly similar to the reference product notwithstanding minor differences in clinically inactive components…