FDA drafts framework to validate human-centric NAMs, trimming animal testing in drug development

The FDA issued a draft guidance to help drug developers validate new approach methodologies (NAMs) as replacements for animal testing in drug development, outlining four core validation principles—context of use, human biological relevance, technical characterization, and fit-for-purpose—and encouraging early consultation with FDA review divisions. NAMs encompass advanced in vitro systems, organoids and organ-on-chip models, in silico methods, and even phylogenetically lower organisms like zebrafish. The goal is to rely on human-relevant data to improve safety predictions and accelerate access to safer therapies, building on previous efforts to reduce animal testing and update related guidance on pyrogen/endotoxin testing.