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Related Concept Videos

Toxic Reactions: Overview01:26

Toxic Reactions: Overview

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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
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Types of Toxins01:36

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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
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Environmental pollutants like...
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Related Experiment Video

Updated: Jan 7, 2026

Advanced 3D Liver Models for In vitro Genotoxicity Testing Following Long-Term Nanomaterial Exposure
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The expanded decision tree: Predicting chronic toxic potential and safe intake levels.

Szabina Stice1, Timothy Adams1

  • 1US Food and Drug Administration, Human Foods Program, Office of Food Chemical Safety, Dietary Supplements, and Innovation, 5001 Campus Drive, College Park, MD, 20740, USA.

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association
|December 29, 2025
PubMed
Summary

The U.S. Food and Drug Administration developed the Expanded Decision Tree (EDT) to improve chemical toxicity assessments. This updated structure-activity relationship tool enhances regulatory toxicology and threshold of toxicological concern screening.

Keywords:
Chronic toxic potentialCramer classification schemeCramer et al. (1978) Decision Tree (CDT)Expanded Decision Tree (EDT)Relative toxic potentialSafety evaluationScreening and prioritizationThreshold of Toxicological Concern (TTC)

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Area of Science:

  • Toxicology
  • Computational Chemistry
  • Regulatory Science

Background:

  • The original Cramer Decision Tree (CDT) has limitations in assessing chemical oral toxicity.
  • Advancements in structure-toxicity relationships necessitate updated assessment tools.
  • The CDT's logic and specificity were insufficient for modern toxicology.

Purpose of the Study:

  • To introduce the Expanded Decision Tree (EDT) as a successor to the CDT.
  • To detail the EDT's development, database, and classification framework.
  • To provide a scientifically robust tool for regulatory toxicology.

Main Methods:

  • Leveraging contemporary toxicology data and metabolism insights.
  • Developing a science-forward, structure-based revision of the CDT.
  • Constructing and utilizing an underlying database for the EDT.

Main Results:

  • The EDT offers an expanded classification framework for chemical substances.
  • Extensive external validation and peer review confirm EDT's efficacy.
  • The EDT demonstrates robust, transparent, and scientifically defensible performance.

Conclusions:

  • The EDT addresses the limitations of the previous Cramer Decision Tree.
  • This tool enhances the assessment of chemical oral toxic potential.
  • The EDT is suitable for regulatory toxicology and TTC screening.