Integrated testing and intelligent assessment-new challenges under REACH

Area of Science:

• Environmental Chemistry
• Toxicology
• Regulatory Science

Background:

• The European Union's Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) regulation mandates comprehensive chemical assessments.
• REACH shifts responsibility for risk assessment from regulatory authorities to industry.
• Previous assessment methods had drawbacks, necessitating a new, integrated approach to chemical safety.

Purpose of the Study:

• To present key findings from the REACH Implementation Projects concerning aquatic toxicity assessments.
• To illustrate the paradigm shift towards integrated data utilization in chemical hazard evaluation.
• To provide guidance on assessing chemical toxicity using a weight of evidence approach.

Main Methods:

• Developing guidance for evaluating toxicity by integrating diverse information sources and uncertainty levels.
• Implementing a flexible, multi-step process including substance characterization, mode of action analysis, and analogue identification.
• Utilizing quantitative structure-activity relationship (QSAR) results and existing in vivo/in vitro data.

Main Results:

• A weight of evidence approach is established for integrating various data types, including non-standard and non-testing information.
• Integrated Testing Strategies (ITS) are developed to guide subsequent testing and optimize assessments.
• The approach enhances the evaluation of classification, labelling, PBT assessment, and PNEC derivation.

Conclusions:

• REACH necessitates a move from extensive standard testing to intelligent, substance-tailored assessments.
• Expert judgment and integrated thinking are crucial for the weight of evidence concept and ITS.
• This approach allows consideration of sub-lethal effects like endocrine disruption and improves risk communication.