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30 Issues L. & Med. 153 (2015)
Abortion and Breast Cancer: Recent Evidence Confirms a Robust Link

handle is hein.journals/ilmed30 and id is 161 raw text is: Abortion and Breast Cancer: Recent Evidence Confirms a Robust Link Joel Brind, Ph.D.* Published evidence of a link between induced abortion and future breast cancer risk dates back to 1957, when a nation-wide study in Japan showed that women with breast cancer had had 3 times as many pregnancies that ended in induced abortion, compared to normal controls.' That was even before the days when the term relative risk was introduced (in 1959), with the typical relative risk estimate being based on the odds ratio (OR) in case-control studies. Relative risk describes numerically the relative likelihood of having a given disease-such as breast cancer-if one has had a particular exposure-such as induced abortion- compared to those who have not had the exposure. RR 1.0 - there is no increase or decrease in risk RR 1.5 - there is a 50% increase in risk RR 2.0 - there is a 100% increase in risk RR 0.5 - there is a 50% decrease in risk In recent years, the abortion-breast cancer link became big news with the 1994 paper by Janet Daling, et al. in the journal of the National Cancer Institute, which reported a statistically significant, 50% risk increase with induced abortion.2 In results, Daling stated Among women who had been pregnant at least once, the risk of breast cancer in those who had experienced an induced abortion was 50% higher than among other women. * Professor of Human Biology and Endocrinology, Baruch College, CUNY, New York, NY and Breast Cancer Prevention Institute, Somerville, NJ. 1M. Segi, I. Fukushima, S. Fujisaku, M. Kurihara, S. Saito, K. Asano and M. Kamoi, An Epidemi- ological Study on Cancer in Japan, The Report of the Committee for Epidemiological Study on Cancer, Sponsored by the Ministry of Welfare and Public Health GANN 1957;48(suppl.):1-63. 2 Daling JR, Malone KE, Voigt LF, White E, Weiss NS. Risk of Breast Cancer Among Young Women: Relationship to Induced Abortion. J Nat'l Cancer Inst. 1994;86:1584-92.

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