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Small Molecule Drugs versus Biomolecular Drugs (Biologics)

Biotechnology has created a broad range of therapies, including vaccines, cell or gene therapies, therapeutic protein hormones, cytokines and tissue growth factors, and monoclonal antibodies. In this discussion we will focus on the categories of biomolecular drugs that are presently managed by the FDA Center for Drugs Evaluation and Research (CDER): monoclonal antibodies, cytokines, tissue growth factors and therpeutic proteins. Some of the data that we will show includes all biologics. Modern biomolecular drugs arise through the processes of genetic engineering.

It has been a little over thirty years since human insulin received U.S. approval (1982) as the first genetically engineered biomolecular drug. Since then biomolecular drugs have become a major force in the bio/pharmaceutical industry. As seen in Table 1, based on worldwide sales, eight out of the top 20 biopharmaceuticals in 2012 were Biomolecular Drugs. (Ref 1, 2) In fact seven of the top 10 were biomolecular drugs!

Table 1, Eight of the Top Twenty Biopharmaceuticals Worldwide in 2012 are BiomolecularDrugs (Data from references, US Ranking. Copaxone ranked 9th in US Sales (Ref 3), and was unranked in worldwide sales. (Ref 1&2)
This may come as a surprise to many in the U.S. where biomolecular drugs have yet to achieve such a prominent stature. In 2012 Humira, Enbrel, Remicade, Neulasta and Rituxan were in the top 10 drugs based on U.S. sales, but the small molecules Nexium, Abilify, Crestor, Advair, and Cymbalta were the top five. (Ref 3) None of the biomolecular drugs were in the top 10 in the U.S. in 2010. (How the rankings of drugs in the U.S. could be so different from the rest of the world is a whole other discussion.) In any event, the rise of biomolecular drugs into the top tier is a recent phenomenon.

Let us compare and contrast these two types of drugs – small molecule and biomolecular drugs, and see how the Industry deals with two seemingly very different types of drugs.


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