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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 contradicted by major medical professional organizations. In early pregnancy, hormone levels increase, leading to breast growth. The hypothesis proposes that if this process is interrupted by an abortion then more immature cells could be left behind, resulting in a greater potential 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 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. Anti-abortion activists have continued to advance a discredited causal link between abortion and breast cancer.〔 In the United States, they have sought legal action 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〔(【引用サイトリンク】title=Weird Science )〕 from large prospective cohort studies demonstrates that abortion is not associated with an increase in breast cancer risk,〔(【引用サイトリンク】title=Summary Report: Early Reproductive Events Workshop – National Cancer Institute )〕 and that the positive findings were likely due to response bias. A large meta-study recently completed for Chinese women reviewing 36 studies also purports to show a statistical link between abortion and breast cancer, but the results have not been reviewed for acceptance by mainstream medical and scientific bodies. 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,〔http://www.nih.gov/about/almanac/organization/NCI.htm〕 found that "induced abortion is not associated with an increase in breast cancer risk", assigning this conclusion the strongest possible evidence rating.〔 * The American College 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."〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Abortion–breast cancer hypothesis」の詳細全文を読む スポンサード リンク
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