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Human carcinogens: an evaluation study via the COMPACT and HazardExpert procedures
D F V Lewi1, M G Bird, M N Jacobs
1Molecular Toxicology Group, School of Biomedical and Life Sciences, University of Surrey, Guildford, UK. d.lewis@surrey.ac.uk
Human & Experimental Toxicology
|July 10, 2002
Summary
Computer-optimized molecular parametric analysis of chemical toxicity (COMPACT) and HazardExpert correctly identified all 14 carcinogens when used together. Combining COMPACT with highest occupied molecular orbital energy analysis improved carcinogen identification to 93%.
Area of Science:
- Computational chemistry
- Toxicology
- Molecular modeling
Background:
- Assessing chemical carcinogenicity is crucial for public health and regulatory safety.
- Existing computational methods for predicting carcinogenicity have limitations in accuracy and scope.
- Understanding molecular mechanisms of chemical toxicity, such as P450 mediation and electrophilic reactivity, is key.
Purpose of the Study:
- To evaluate the predictive accuracy of COMPACT and HazardExpert for human carcinogenicity.
- To explore the combined utility of COMPACT, HazardExpert, and molecular orbital energy analysis in carcinogen identification.
- To establish a rapid and cost-effective computational approach for predicting carcinogenicity.
Main Methods:
- Computer-Optimized Molecular Parametric Analysis of Chemical Toxicity (COMPACT) and HazardExpert software were employed.
- Evaluations were performed on a dataset of 14 established human carcinogens.
- Analysis included assessing the concordance between computational predictions and known carcinogenicity, incorporating highest occupied molecular orbital (E(HOMO)) values.
Main Results:
- COMPACT showed 71% concordance with carcinogenicity, while HazardExpert showed 57%.
- Combined use of COMPACT and HazardExpert achieved 100% correct identification of the 14 carcinogens.
- Incorporating a negative E(HOMO) value with COMPACT correctly identified 93% of the carcinogens, indicating electrophilic reactivity.
Conclusions:
- The combination of COMPACT and HazardExpert significantly improves the prediction of human carcinogenicity.
- Analysis of E(HOMO) values in conjunction with COMPACT provides a highly accurate method (93%) for identifying potential carcinogens.
- This straightforward computational approach enables rapid, low-cost prediction of carcinogenicity linked to P450 mediation or compound electrophilicity.