Chemical carcinogenesis studies in nonhuman primates

Area of Science:

• Toxicology
• Primate Research
• Carcinogenesis

Background:

• The National Cancer Institute (USA) conducted chemical carcinogenesis studies in nonhuman primates.
• This research aimed to compare primate susceptibility to rodent carcinogens.

Purpose of the Study:

• To evaluate the carcinogenic potential of various chemical compounds in nonhuman primates.
• To determine if nonhuman primates share susceptibility to carcinogens with rodents.

Main Methods:

• Review of autopsy records from 401 nonhuman primates (cynomolgus, rhesus, African green monkeys).
• Testing of diverse chemical compounds, including antineoplastic agents, food-related compounds, pesticides, N-nitroso compounds, heterocyclic amines, and rodent carcinogens.
• Administration of tested compounds at doses 10-40 times estimated human exposure levels.

Main Results:

• Spontaneous malignant tumor incidence varied: cynomolgus monkeys (1.9%), rhesus monkeys (3.8%), and African green monkeys (8%).
• Unequivocal carcinogenicity was demonstrated for IQ, procarbazine, methylnitrosourea, and diethylnitrosamine.
• Negative findings for saccharin and cyclamate aligned with other species' results.

Conclusions:

• Nonhuman primates exhibit susceptibility to certain chemical carcinogens.
• Carcinogenic pathways appear to be at least partly shared between nonhuman primates and rodents.
• This research provides valuable data on primate responses to chemical exposures.