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The implementation of RAAF in the OECD QSAR Toolbox.

Chanita Kuseva1, Terry W Schultz2, Darina Yordanova1

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Summary

The Read-Across Assessment Framework (RAAF) is now integrated into the OECD QSAR Toolbox, enhancing chemical grouping and read-across assessments. This tool ensures robust and transparent regulatory evaluations for chemical safety predictions.

Keywords:
Assessment elementsCategory elements uncertaintyOECD QSAR toolboxRAAFRead-across

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Area of Science:

  • Chemical safety assessment
  • Toxicology
  • Computational chemistry

Background:

  • The European Chemicals Agency (ECHA) developed the Read-Across Assessment Framework (RAAF) as an internal tool.
  • RAAF provides a structured approach for assessing chemical grouping and read-across.
  • Ensuring regulatory robustness of read-across predictions is crucial for chemical safety.

Purpose of the Study:

  • To describe the implementation of RAAF functionalities within the OECD QSAR Toolbox report.
  • To enable external developers and users to perform RAAF-based evaluations.
  • To enhance the transparency and consistency of read-across assessments.

Main Methods:

  • Integration of RAAF functionalities into the OECD QSAR Toolbox prediction report.
  • Manual user selection of appropriate RAAF scenarios.
  • Automatic alignment of RAAF assessment elements with Toolbox category elements.
  • Evaluation within the Toolbox's category consistency assessment functionality.

Main Results:

  • RAAF functionalities are now accessible within the OECD QSAR Toolbox.
  • The implementation facilitates automated alignment and evaluation of read-across assessments.
  • Practical examples demonstrate the application of the integrated RAAF functionality.

Conclusions:

  • The integration of RAAF into the OECD QSAR Toolbox improves the consistency, structure, and transparency of chemical grouping and read-across.
  • This enhancement supports robust regulatory assessments of chemical safety predictions.
  • The tool empowers users outside ECHA to conduct reliable read-across evaluations.