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The totality-of-evidence approach requires that similarity between a proposed biosimilar and a reference biologic is demonstrated across a range of analytical, preclinical, and clinical parameters to establish biosimilarity. We describe the totality of evidence for Sandoz biosimilar pegfilgrastim (LA-EP2006 [marketed as Ziextenzo]) that supported its regulatory approval in Europe and the United States. Analytical similarity to the reference biologic [marketed by Amgen as Neulasta] was first investigated with regard to physiochemical quality attributes such as primary structure, pegylation, higher-order structures, variants and impurities, molecular size variants, and formulation (protein content, pH, excipients, etc.).  In vitro  biological activity studies were performed to examine the primary mechanism of action of pegfilgrastim. Bioequivalence (clinical pharmacokinetics [PK] and pharmacodynamics [PD]) of Sandoz biosimilar pegfilgrastim to the reference biologic was studied in healthy volunteers; efficacy, safety, and immunogenicity were assessed during confirmatory clinical efficacy studies in patients undergoing treatment for breast cancer. No meaningful or relevant differences were identified between Sandoz biosimilar pegfilgrastim and the reference biologic during analytical testing. Similar receptor binding and induction of cellular proliferation  in vitro  confirmed no functional differences between the biologics. Clinical studies in healthy adult participants demonstrated PK/PD biosimilarity and a similar safety profile between biosimilar and reference pegfilgrastim. Clinical studies in a sensitive patient population also demonstrated similar efficacy, safety, and immunogenicity between Sandoz biosimilar pegfilgrastim and the reference biologic. The totality of evidence confirms that Sandoz biosimilar pegfilgrastim matches the reference biologic and will therefore provide equivalent efficacy and safety in all eligible indications.

A review of the totality of evidence supporting the development and approval of a pegfilgrastim biosimilar (LA-EP2006)