In 2004 the Collaborative Group on Hormonal Factors in Breast Cancer evaluated the worldwide epidemiological evidence on the possible relation between breast cancer and previous spontaneous and induced abortion ad found no link. The results, drawn from 53 studies, were published in the Lancet.Link to abstract.
A new study confirms this data, that there is no link between abortion and breast cancer. The data come from a study of over 25,000 Danish women from the DIet, Cancer, and Health study. The women completed questionnaires and then were followed for an average of 12 years. This kind of study is probably the best way to look at two common and emotional charged occurrences, like abortion and breast cancer, because there is no recall bias. When something bad happens it is human nature to look back and try to assign causality, but collecting the data prospectively removes this element. The study was also well-powered to detect even a small increase, so another plus.
Thursday, 13 June 2013
So, inquiring minds want to know -- how much (non) evidence will be enough? Probably no amount will ever satisfy the nutters, but here's yet another study that finds NO evidence of an association between induced abortion and breast cancer risk.