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US FDA moves to curtail primate testing in drug trials

The FDA's draft guidelines allow alternative human-relevant models and risk assessments to reduce primate testing and lower drug development costs, Commissioner Makary said.

  • Dec 2 a U.S. regulatory agency published draft guidance to reduce primate testing for monoclonal antibodies using alternative models.
  • The agency signaled this change earlier this year as part of initiatives under Martin Makary, FDA Commissioner, to streamline development and lower drugmaker costs amid competition from China's biotech sector.
  • Typically about 100 macaque monkeys are used in such programs, costing roughly $50,000 per animal, and primate testing lasting up to six months can be reduced with organoid systems and laboratory off-tissue binding tests.
  • The FDA launched a voucher program awarding 15 fast passes and expanded AI initiatives this week, while outlining a less-burdensome pathway for ultra-rare disease drugs.
  • Officials say the change should shorten development timelines and lower research and development costs, which could reduce primate use, improve animal welfare, and boost global competitiveness in drug development.
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Reuters broke the news in United Kingdom on Tuesday, December 2, 2025.
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