Biological studies of power-frequency fields and carcinogenesis

The laboratory data on power frequency fields does not provide any real support for an association between exposure to power-frequency fields and cancer. In fact, given the relative weakness of the epidemiology, combined with the extensive and unsupportive laboratory studies, and the biophysical implausibility of interactions at relevant field strengths, it is often difficult to see why there is still any scientific controversy over the issue of power-frequency fields and cancer. Nevertheless, the public controversy remains. This is seen in continuing litigation over cancers alleged to be caused by exposure to power-frequency fields, and by the public opposition that meets most attempts to site new powerlines and substations or to upgrade existing facilities. The public concern is sustained by periodic reports of positive findings, by the inability of scientists to guarantee that no risk exists, and by statements from scientists and government officials that more research is needed.