Abstract: A biological product, or biologic, is a preparation, such as a drug or a vaccine, that is made from living organisms. Compared with conventional chemical drugs, biologics are relatively large and complex molecules. They may be composed of proteins (and/or their constituent amino acids), carbohydrates (such as sugars), nucleic acids (such as DNA), or combinations of these substances. Biologics may also be cells or tissues used in transplantation. A biosimilar, sometimes referred to as a follow-on biologic, is a therapeutic drug that is similar but not structurally identical to the brand-name biologic made by a pharmaceutical or biotechnology company. In contrast to the relatively simple structure and manufacture of chemical drugs, biosimilars, with their more complex nature and method of manufacture, will not be identical to the brand-name product, but may instead be shown to be highly similar. The Food and Drug Administration (FDA) regulates both biologics and chemical drugs. Biologics and biosimilars frequently require special handling (such as refrigeration) and processing to avoid contamination by microbes or other unwanted substances. Also, they are usually administered to patients via injection or infused directly into the bloodstream. For these reasons, biologics often are referred to as specialty drugs. The cost of specialty drugs, including biologics, can be extremely high. In April 2006, the European Medicines Agency (EMA) authorized for marketing in Europe the first biosimilar product, Omnitrope, a human growth hormone. The EMA has authorized a total of 21 biosimilars for the European market. The introduction of biosimilars in Europe has reduced prices for biologics overall, in some cases by 33% compared with the original price of the brandname product. For one drug in Portugal, the price reduction was 61%. In contrast, the pathway to marketing biosimilars in the United States has had several barriers. FDA approved Omnitrope in June 2006, following an April 2006 court ruling that the FDA must move forward with consideration of the application. At the time Omnitrope was approved, FDA indicated that this action “does not establish a pathway” for approval of other follow-on biologic drugs and stated that Congress must change the law before the agency can approve copies of nearly all other biotech products. Four years later, in March 2010, Congress established a new regulatory authority for FDA by creating an abbreviated licensure pathway for biological products demonstrated to be “highly similar” (biosimilar) to or “interchangeable” with an FDA-licensed biological product. The new authority was accomplished via the Biologics Price Competition and Innovation Act (BPCIA) of 2009, enacted as Title VII of the Affordable Care Act (ACA, P.L. 111-148). In addition, Congress authorized FDA to collect associated fees via the Biosimilar User Fee Act of 2012 (BsUFA, P.L. 112-144). FDA has approved three biosimilars for marketing in the United States: Zarxio (filgrastim-sndz) in March 2015, Inflectra (infliximab-dyyb) in April 2016, and Erelzi, (etanercept-szzs) in August 2016. The entry of such products on the U.S. market may result in price reductions similar to those that have occurred in Europe. [ABSTRACT FROM AUTHOR]
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