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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Abortion–breast cancer hypothesis | 1/4 | https://en.wikipedia.org/wiki/Abortion–breast_cancer_hypothesis | reference | science, encyclopedia | 2026-05-05T09:15:13.301340+00:00 | kb-cron |
The abortion–breast cancer hypothesis posits that having an induced abortion can increase the risk of getting breast cancer. This hypothesis is at odds with mainstream scientific opinion and is rejected by major medical professional organizations; despite this, it continues to be widely propagated as pseudoscience, typically in service of an anti-abortion agenda. In early pregnancy, hormone levels increase, leading to breast growth. The hypothesis proposes that if this process is altered by an abortion, then more immature cells could be left behind, and that these immature cells could increase the risk of breast cancer over time. The abortion–breast cancer hypothesis has been the subject of extensive scientific inquiry, and the scientific community has concluded that abortion does not cause breast cancer; and that breast cancer should not be a concern for women who are having a miscarriage or considering having an abortion. This consensus is supported by major medical bodies, including the World Health Organization, the U.S. National Cancer Institute, the American Cancer Society, the American Congress of Obstetricians and Gynecologists, the Royal College of Obstetricians and Gynaecologists, the German Cancer Research Center, and the Canadian Cancer Society. Some anti-abortion activists have continued to advance a discredited causal link between abortion and breast cancer. In the United States, they have advanced state legislation that in several states requires health care providers to present abortion as a cause of breast cancer when counseling women who are seeking abortion. This political intervention culminated when the George W. Bush administration altered the National Cancer Institute website to suggest that abortion might cause breast cancer. In response to public concern over this intervention, the NCI convened a 2003 workshop bringing together over 100 experts on the issue. This workshop concluded that while some studies reported a statistical correlation between breast cancer and abortion, the strongest scientific evidence from large prospective cohort studies demonstrates that abortion is not associated with an increase in breast cancer risk, and that the positive findings were likely due to response bias. The ongoing promotion of a link between abortion and breast cancer is seen by others as part of the anti-abortion "woman-centered" strategy against abortion. Anti-abortion groups maintain they are providing information necessary for legally required informed consent, a concern shared by some politically conservative politicians. The abortion–breast cancer issue remains the subject of political controversy.
== Views of medical organizations == Major medical organizations which have analyzed data on abortion and breast cancer have uniformly concluded that abortion does not cause breast cancer. These organizations include the World Health Organization, the U.S. National Cancer Institute, the American Cancer Society, the American Congress of Obstetricians and Gynecologists, the Royal College of Obstetricians and Gynaecologists, the German Cancer Research Center, and the Canadian Cancer Society.
The World Health Organization concluded in 2012 that "sound epidemiological data show no increased risk of breast cancer for women following spontaneous or induced abortion", updating their earlier finding that "induced abortion does not increase breast cancer risk". The American Cancer Society concluded: "At this time, the scientific evidence does not support the notion that abortion of any kind raises the risk of breast cancer or any other type of cancer." The U.S. National Cancer Institute, which is part of the National Institutes of Health, found that "induced abortion is not associated with an increase in breast cancer risk", assigning this conclusion the strongest possible evidence rating. The American Congress of Obstetricians and Gynecologists found that "early studies of the relationship between prior induced abortion and breast cancer risk were methodologically flawed. More rigorous recent studies demonstrate no causal relationship between induced abortion and a subsequent increase in breast cancer risk." The Royal College of Obstetricians and Gynaecologists reviewed the medical literature and concluded that "there is no established link between induced abortion or miscarriage and development of breast cancer." The college recommended in its official clinical practice guidelines that "Women should be informed that induced abortion is not associated with an increase in breast cancer risk." The German Cancer Research Center concluded in 2013 that abortion and miscarriage pose no risk of breast cancer. The Canadian Cancer Society stated in 2013: "The body of scientific evidence does not support an association between abortion and increased breast cancer risk."
== Proponents == Joel Brind, a faculty member at Baruch College in the Department of Natural Sciences, is the primary advocate of an abortion–breast cancer ("ABC") link. Brind is strongly anti-abortion and began lobbying politicians with the claim that abortion caused breast cancer in the early 1990s. Brind found that his lobbying efforts were not taken seriously because he had not published his findings in the peer-reviewed medical literature. He therefore collaborated with two anti-abortion physicians and a statistician to publish a 1996 article in the Journal of Epidemiology and Community Health, arguing that induced abortion was a risk factor for breast cancer. The statistician who collaborated with Brind later stated of their findings: "I have some doubts. I don't think the issue has been resolved. When we were talking about the conclusions, he [Brind] wanted to make the strongest statements. I tried to temper them a little bit, but Dr. Brind is very adamant about his opinion." Brind's paper was criticized in the Journal of the National Cancer Institute for ignoring the role of response bias and for a "blurring of association with causation." The amount of attention the study received prompted a cautionary editorial by a JECH editor. With the appearance of larger studies contradicting Brind's finding, Brind failed to convince the scientific community that abortion caused breast cancer. In 2003, Brind was invited to the NCI workshop on abortion and breast cancer, where he was the only one to formally dissent from the workshop's finding that there is no link between the two. Brind blames the lack of support for his findings on a conspiracy, arguing that the NCI and other major medical organizations are engaged in a "cover-up" for the purpose of "protecting the abortion industry".
== Proposed mechanism ==