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2017 ; 114
(12
): 2696-2705
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Biosimilars: Key regulatory considerations and similarity assessment tools
#MMPMID28842986
Kirchhoff CF
; Wang XM
; Conlon HD
; Anderson S
; Ryan AM
; Bose A
Biotechnol Bioeng
2017[Dec]; 114
(12
): 2696-2705
PMID28842986
show ga
A biosimilar drug is defined in the US Food and Drug Administration (FDA)
guidance document as a biopharmaceutical that is highly similar to an already
licensed biologic product (referred to as the reference product) notwithstanding
minor differences in clinically inactive components and for which there are no
clinically meaningful differences in purity, potency, and safety between the two
products. The development of biosimilars is a challenging, multistep process.
Typically, the assessment of similarity involves comprehensive structural and
functional characterization throughout the development of the biosimilar in an
iterative manner and, if required by the local regulatory authority, an in vivo
nonclinical evaluation, all conducted with direct comparison to the reference
product. In addition, comparative clinical pharmacology studies are conducted
with the reference product. The approval of biosimilars is highly regulated
although varied across the globe in terms of nomenclature and the precise
criteria for demonstrating similarity. Despite varied regulatory requirements,
differences between the proposed biosimilar and the reference product must be
supported by strong scientific evidence that these differences are not clinically
meaningful. This review discusses the challenges faced by pharmaceutical
companies in the development of biosimilars.