An analysis of the Gene-Tox Carcinogen Data Base

Area of Science:

• Toxicology
• Carcinogenesis
• Chemical Safety

Background:

• The Gene-Tox Carcinogen Data Base compiles evaluated cancer data for 506 chemicals.
• Chemicals were selected based on prior genetic toxicology bioassay assessments.

Purpose of the Study:

• To analyze the distribution of chemicals within the Gene-Tox database into major chemical classes.
• To examine cancer study characteristics, including animal species, administration routes, tumor sites, and types.
• To assess species-specific carcinogenic effects and compare predictive capabilities of genetic toxicology assays.

Main Methods:

• Categorization of 506 chemicals into major chemical classes.
• Analysis of cancer study data for 199 chemicals (rated Sufficient/Limited Positive/Negative).
• Evaluation of species-specific carcinogenicity and correlation with genetic toxicology bioassay results.

Main Results:

• Major chemical classes identified include halides, alcohols, amines, benzene derivatives, organometallics, and polycyclic aromatic hydrocarbons.
• Lifetime rodent studies, primarily oral administration in rats and mice, targeted organs like liver, lung, and skin.
• High correspondence (85%) in carcinogenic effects between mice and rats was observed.
• A high prevalence of positive results (>80-90%) was noted in genetic toxicology bioassays with over 30 chemicals, but predictive power remains uncertain.

Conclusions:

• The Gene-Tox database provides a structured overview of chemical carcinogenicity data.
• Rodent models show significant concordance in cancer responses, aiding comparative toxicology.
• Further research is needed to establish the reliability of genetic toxicology assays for predicting animal carcinogenicity.