Overcoming Difficult, Impossible, and Meaningless Animal Testing under REACH: Opportunities for Robust Chemical Risk...

Area of Science:

• Chemical safety assessment
• Toxicology
• Regulatory science

Background:

• The European Union's REACH regulation promotes minimizing animal testing through mechanisms like data sharing and read-across.
• Despite existing frameworks, new animal studies are sometimes required even when they offer limited scientific or regulatory value.
• Translating REACH's flexibility for non-animal testing into consistent practice remains a challenge.

Purpose of the Study:

• To define scientific and procedural criteria for identifying "difficult, impossible, or meaningless" (DIM) animal testing scenarios within the EU REACH framework.
• To demonstrate how non-animal testing methods can effectively address information requirements in identified DIM cases.
• To propose recommendations for refining criteria and promoting non-animal approaches for chemical safety.

Main Methods:

• Development of specific scientific and procedural criteria by the Animal-Free Safety Assessment (AFSA) Collaboration to define DIM testing.
• Application of these DIM criteria to screen REACH registration dossiers for cases where animal testing may be unnecessary.
• Analysis of existing non-animal approaches to address information needs in identified DIM situations.

Main Results:

• Specific criteria were defined to identify situations where animal testing under REACH is difficult, impossible, or meaningless.
• The AFSA DIM initiative identified concrete scenarios where animal testing provides no added value.
• Existing non-animal methods were shown to be capable of addressing information needs in these identified cases.

Conclusions:

• Further refinement of DIM criteria is recommended for broader application to REACH endpoints, prioritizing human health.
• Adaptations to avoid DIM testing for human health endpoints should be evaluated.
• Increased focus on exposure-driven assessment within Next-Generation Risk Assessment (NGRA) is suggested for chemical safety evaluations.