Forced Degradation Studies: Regulatory Considerations and Implementation

The current regulatory guidances governing forced degradation studies of biological pharmaceuticals are extremely general. They itemize broad principles and approaches with few practical instructions. There is no single document that comprehensively addresses issues related to stress studies such as objectives, timing, selection of stress conditions, and extent of degradation. We will attempt to fill that gap by summarizing regulatory guidance for stress studies of biological products and present some examples of their practical applications.

The complexity of biological macromolecules when compared to small molecule therapeutics, differences in manufacturing, and the broad variety of potential degradation pathways lead to special requirements in quality assurance and analytical testing of pharmaceutical proteins. The product-related impurities are molecular variants formed during manufacture, storage, or use, and their properties are different from the desired product with respect to activity, efficacy, and safety.1

Forced degradation studies are designed to generate product-related variants and develop analytical methods to determine the degradation products formed during accelerated pharmaceutical studies and long-term stability studies. Any significant degradation product should be evaluated for potential hazard and the need for characterization and quantitation.2

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