Most PCBs Not As Carcinogenic As Thought
University of GeorgiaScientists believe there is little doubt that compounds called polychlorinated biphenyls (PCBs) cause cancer in animal studies. It has been illegal to produce PCBs in the United States since 1977, but huge amounts of the compounds remain in the environment, raising serious concerns for public health officials. A new study, however, has found that many of the PCBs in the environment in this country may not be as carcinogenic as previously thought.