FDA Regulation changes: The Problem is still Validation
In March 2026, the FDA published draft guidance that fundamentally changed how NAMs (New Approach Methodologies) are evaluated in drug development. If you’re designing NAMs, whether that be spheroids, organoids, or organs-on-a-chip, your model now must meet specific validation criteria set by regulators. This draft document, titled ‘General Considerations for the Use of New Approach Methodologies in Drug Development’ provides requirements on the use of NAMs, including in vitro, in silico and in chemico methods (FDA & CDER, 2026). This guidance is a big shift from aspirational recommendations towards clearer regulatory recommendations.
It comes on the coattails of consistent feedback and challenges the market has seen over the past few years as they attempt to transition and optimize away from animal models. Mainly being:
“How can I be sure the data I get from this non-animal model is reliable, trustworthy and relevant?”
This regulatory mandate from the FDA requires researchers to use models and assays that meet four validation criteria:
- Context of use
- Human biological relevance
- Technical characterization
- Fit-for-purpose
This guidance initially applies to antibody development, biologics, and will eventually be relevant for small molecules. The momentum in the market is sound and indicates that there is a real need for assays that meet these new requirements.
Continue reading “New Approach Methodologies: Guidelines for Biological Ground Truths”







