Robert F. Kennedy, the secretary of Health and Human Services, still believes that cell phones are causing brain cancer, as revealed in a congressional hearing in January.
But numerous studies going back to the year 2000 all indicate there is no particular reason to fear cell phones as a cause of cancer, and a new paper by Li Zhang and Joshua Muscat of the Department of Public Health Sciences at Pennsylvania State University examines the most up-to-date data from the United States to examine this question as if for the first time.
Most studies on this question so far have been case-control studies. This type of study is subject to biases (information bias and selection bias) because it selects subjects who already have the disease of interest (in this case, brain cancer). Although prospective studies avoid the biases inherent in case-control studies, they are expensive and difficult to carry out, especially for rare diseases such as brain cancer.
