Biosimilars: similar but not identical
Biosimilars are biological medicinal products that have been developed to be highly similar in all essential aspects (i.e., structure, immunogenicity profile, quality, safety, and efficacy) to an already authorised biological medicinal product. The already authorised biological medicinal product is called the reference product.
Due to their complexity, biosimilars are treated differently from generics in terms of regulatory treatment. As biologics are derived from living organisms, producing identical products using different manufacturing processes is not possible. Proof of bioequivalence is therefore not sufficient for biosimilars. Instead, additional comparability studies must be conducted to show that minor differences do not affect safety and efficacy. For the development of biosimilars, the EMA offers scientific advisory meetings to agree on the studies to be conducted.
Biosimilars, like generics, may only be brought to market after the 10-year marketing protection period of the EU reference product has expired. The first biosimilar in the EU was approved in 2006.