Chronic toxicity and carcinogenicity studies with FWAs

Area of Science:

• Toxicology
• Pharmacology
• Veterinary Medicine

Background:

• Long-term toxicity and carcinogenicity studies are crucial for evaluating chemical safety.
• Rodents and canines are commonly used models for preclinical safety assessments.

Purpose of the Study:

• To assess the chronic toxicity and carcinogenic potential of compounds (1), (2), (3), and (4).
• To evaluate the safety of these compounds in rodent and canine models.

Main Methods:

• A 2-year feeding study in albino rats at dietary levels up to 1000 ppm.
• A 2-year feeding study in beagle dogs at dietary levels up to 2000 ppm for compounds (2), (3), and (4).
• A 2-year feeding study in beagle dogs at 400 and 1000 ppm for compound (1).

Main Results:

• Compounds (1), (2), (3), and (4) demonstrated no adverse toxic effects or carcinogenic activity in rats up to 1000 ppm.
• Compounds (2), (3), and (4) showed no adverse effects in dogs up to 2000 ppm.
• Compound (1) at 400 and 1000 ppm caused decreased weight gain, serosal inflammation, and increased hematopoietic activity in dogs, potentially linked to unadjusted pH during the initial 30 weeks.

Conclusions:

• Compounds (2), (3), and (4) are deemed safe for long-term exposure at the tested levels in both rats and dogs.
• Compound (1) exhibits dose-related toxicity in dogs, necessitating further investigation into the role of pH and potential mitigation strategies.