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The relationship between induced and spontaneous abortion and breast cancer risk has been the subject of extensive research beginning in the late 1950s. It is clearly an emotional topic for many people. The fact is that until the mid-1990s, the evidence of a link between abortion and breast cancer was inconsistent. Findings from some studies suggested there was no increase in risk of breast cancer among women who had had an abortion, while findings from other studies suggested there was an increased risk. Most of these studies, however, were flawed in a number of ways that can lead to unreliable results. As stated in the article, more than 100 experts convened by the National Cancer Institute in 2003 reviewed a considerable amount of evidence to come to their collective agreement that ending a pregnancy early does not necessarily raise a woman's breast cancer risk. You can read the information for yourself, along with a link to the report at http://www.cancer.gov/cancertopics/factsheet/Risk/abortion-miscarriage.