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Marie H. Hanigan, PhD

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In a recent study, Zahl and colleagues¹ reported that women who were screened for breast cancer every 2 years over a 6-year period had a significantly higher incidence of invasive breast cancer than women who were screened only once at the end of the 6-year study. The authors considered several explanations for their observations. They ruled out the possibilities that the groups were not equivalent in terms of risk or that the sensitivity of mammography led to increased diagnosis in the population that underwent repeated mammography. They concluded by raising the possibility that some invasive breast cancers detected by mammography regress spontaneously. In their analysis of the data they did not consider the alternative hypothesis that repeated mammography is inducing breast cancer.

There was no information in the article regarding the type of equipment used for the mammography. Mammography subjects the tissue in the breast to . . . [Full Text of this Article]

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