In laboratory studies, organochlorines have been associated with which outcome?

• A. Diabetes in humans
• B. Liver cancer in lab animals
• C. Asthma in children
• D. Increased fertility in rodents

Answer: (B)

Organochlorines are lipophilic, persistent chemicals that tend to accumulate in the liver during chronic exposure. In long-term animal studies, several organochlorines have produced liver tumors, with evidence of hepatocellular carcinogenesis in rats and mice. The liver is the main organ for metabolism and detoxification, so these compounds are processed there by enzymes like cytochrome P450. This metabolic processing can generate reactive intermediates and cause oxidative stress or DNA damage, promoting uncontrolled liver cell growth and tumor development. Because of this, liver cancer is the outcome most consistently associated with organochlorines in laboratory cancer studies. Other options, such as diabetes in humans, asthma in children, or increased fertility in rodents, are not the primary findings from these standard lab carcinogenicity studies.