Small-molecule treatments are invaluable in providing symptomatic benefits for an array of illnesses. However, many serious conditions — ranging from cancer to autoimmune disorders — respond better to more sophisticated complex drugs such as therapeutic biologics and nonbiologic complex drugs (NBCDs). The latter are medicinal, nonbiological products in which the active substance is not a homomolecular structure, but rather consists of a number of different (closely related) structures that cannot be fully characterized. The US Food and Drug Administration (FDA)…