(Each entry represents one finding in the studies, unless otherwise noted. Some studies had multiple findings.) 

• mortality from brain cancer was modestly increased among men with up to 10,000 hours PCB exposure
• no deaths from brain cancer occurred among the most highly PCB exposed men
• a five-year lag time increased the brain cancer rate
• More deaths were observed than expected for cancer of the brain and nervous system
• The average estimated cumulative PCB dose for the cases of brain cancer was greater than for other workers
• PCBs are known to deposit preferentially in nervous tissue
• Study examined two PCB-exposed workers with brain cancer
• Researchers urge more studies of link between PCBs and brain cancer
• increased incidence of brain cancer among workers who had more than twice the estimated cumulative PCB dose than the comparison group
• PCB-exposed workers experienced excess in the number of deaths resulting from brain cancer
• elevated risks of brain cancer have been noted in electrical workers, who tend to be exposed to PCBs
• Brain cancer was significantly increased in females exposed to dioxin [certain PCBs are dioxin-like, or contaminated with dioxin]
• A statistically significant higher concentration of PCB was found in extracted lipids of adipose tissue samples from terminal brain cancer patients
• Nerve Growth Factor (NGF) was more potent in the presence of PCBs
• PCBs have the potential to influence the NGF neurotrophic system
• children of fathers exposed to dioxin experienced increased rates of brain cancer
• there is suggestive evidence that brain tumors are associated with parental exposures to chemicals
• causes of endocrine-related cancers or susceptibility to cancer may be a result of developmental exposures rather than exposures existing at or near the time of tumor detection
• A glioma case [brain cancer] was associated with dioxin exposure
• alteration of cellular redox balance may mediate the dioxin-induced inhibition of proliferation in human neuronal cells.

Go to: 

• Introduction
• The High Cost of Brain Cancer
• Summary of Study Results
• Studies Linking Brain Cancer, PCBs and Dioxins
• References
• Links to More Information