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Here is EVERY scientific medical article posted on the medical abstracts list (medline) found through a search in OVID, covering the time from now, back 5 years. (Entire abstracts and references available)
The studies are
1: Lash (6/04) – unknown number of women (all women giving birth 1987-1999 in MA).
Epidemiological study.
Finding: Abortion protects against breast cancer in women who gave birth at least once.
2: Beral (3/04) –53 studies comparing the prospective studies (44,000 breast cancer cases) and retroactive studies (39,000 breast cancer cases).
Meta-analysis of prospective and retroactive studies.
Finding: No evidence of spontaneous or induced abortion causing breast cancer. Older retroactive studies were imprecise (These are the ones the PL like to cite) “yielded misleading results.”
3: Palmer (3/04) – Black Women’s Health Study, 348 cases of breast cancer.
Prospective cohort study.
Finding: induced abortion does not increase breast cancer risk in African-American women.
4: ACOG (8/03, 11/03) – review of all studies.
Review article
Finding: studies argue against a causal relationship between induced abortion and a subsequent increase in breast cancer risk.
5: Paoletti (8/03) – 100,000 women, 2600+ breast cancer cases.
Prospective cohort study.
Finding: there is no relationship between breast cancer and induced abortion but that an association with spontaneous abortion is possible and may depend on menopausal status
6: Becher (2/03) – 706 breast cancer patients.
Case control study.
Finding: Genetics were biggest risk factor, multiple pregnancies and long-duration breastfeeding were most protective factors. History of abortion and age of menses had no effect.
7: Mahue (3/03) – 744 breast cancer patients.
Retroactive study.
Finding: Breast cancer after giving birth not related to miscarriage or induced abortion. Among women who never gave birth, risk was lower with history of an induced abortion (“although the risk estimate was imprecise.)” “Risk declined as the number of induced abortions increased (P = 0.04). Our results do not support the hypothesis that induced abortion or miscarriage increase the breast cancer risk of young women.”
8: Erlandsson – (2/03). All Swedish women giving birth 1973-1991.
Prospective case-control study.
Finding: “In conclusion, neither a history of induced nor spontaneous abortions is associated with an increased risk of breast cancer. Our data suggest a protective effect of pregnancies regardless of outcome.”
Now, note this study. It SPECIFICALLY investigated the hormonal effect. What they specifically studied was this:
“”””It has been suggested that abortions leave the breast epithelium in a proliferative state with an increased susceptibility to carcinogenesis.””””
In other words, that hormonal effects on the breast from inducing abortions or from interrupting pregnancy makes the woman more susceptible to breast cancer. And, of course, their finding STILL showed this not to be the case. This was a case-control study, as accurate as they get. Those of you who question the hormone issue, go read this study.
9: Ye (10/02). 267,040 women, 652 (or more)
Prospective, randomized case-control study.
Breast cancer not associated with abortions, with number of abortions, or with abortions after first birth. They have this comment, though” Few women had undergone an abortion after 13 weeks gestation or before their first child. Although increases in risk were observed in such women, they were not statistically significant and could have been due to recall bias.”
10: Chaudry (4/02) – 245 African-American families.
Prospective epidemiological study of specific breast cancer gene.
Finding: “This putative gene was found to interact significantly with age at menarche (P = 0.048), and an interaction with a history of spontaneous abortions was suggested (P = 0.08). A late age at menarche increased BC risk in gene carriers but had a protective effect in non-gene carriers. A history of spontaneous abortions had a protective effect in gene carriers and increased BC risk in non-gene carriers.”
11: Davidson (12/01) – Review of all articles.
Review Article
Finding: “Over recent years, concerns have been raised about a possible causal relation between induced abortion and subsequent breast cancer”….” refuting this hypothesis and concludes that there are, to date, insufficient data to justify warning women of future breast-cancer risk when counselling them about abortion”
This article ALSO mainly looked at the issue of hormonal changes
12: Sanderson (6/01) – 1459 breast cancer patients
Prospective epidemiological study
Finding: there was no relation between ever having had an induced abortion and breast cancer
13: Newcomb (10/00). 252 breast cancer patients
Prospective case-control study.
Finding: No connection between breast cancer and induced or spontaneous abortion in women, whether they ever gave birth or not.
14: Tang (3/00) 463 breast cancer patients and controls.
Case-controlled cohort study
Finding: Induced abortion in women who later give birth does not cause risk for breast cancer.
And for good meassure, here is that Cancer Society link again:
http://www.cancer.org/docroot/CRI/c...tion_Cause_or_Contribute_to_Breast_Cancer.asp
What the Experts Say
In February 2003, the US National Cancer Institute (NCI) convened a workshop of over 100 of the world’s leading experts who study pregnancy and breast cancer risk. The experts reviewed existing human and animal studies on the relationship between pregnancy and breast cancer risk, including studies of induced and spontaneous abortions. Among their conclusions were:
Breast cancer risk is transiently (temporarily) increased after a term pregnancy [resulting in the birth of a living child].
Induced abortion is not associated with an increase in breast cancer risk.
Recognized spontaneous abortion is not associated with an increase in breast cancer risk.
The level of scientific evidence for these conclusions was considered to be "well established" (the highest level).
The studies are
1: Lash (6/04) – unknown number of women (all women giving birth 1987-1999 in MA).
Epidemiological study.
Finding: Abortion protects against breast cancer in women who gave birth at least once.
2: Beral (3/04) –53 studies comparing the prospective studies (44,000 breast cancer cases) and retroactive studies (39,000 breast cancer cases).
Meta-analysis of prospective and retroactive studies.
Finding: No evidence of spontaneous or induced abortion causing breast cancer. Older retroactive studies were imprecise (These are the ones the PL like to cite) “yielded misleading results.”
3: Palmer (3/04) – Black Women’s Health Study, 348 cases of breast cancer.
Prospective cohort study.
Finding: induced abortion does not increase breast cancer risk in African-American women.
4: ACOG (8/03, 11/03) – review of all studies.
Review article
Finding: studies argue against a causal relationship between induced abortion and a subsequent increase in breast cancer risk.
5: Paoletti (8/03) – 100,000 women, 2600+ breast cancer cases.
Prospective cohort study.
Finding: there is no relationship between breast cancer and induced abortion but that an association with spontaneous abortion is possible and may depend on menopausal status
6: Becher (2/03) – 706 breast cancer patients.
Case control study.
Finding: Genetics were biggest risk factor, multiple pregnancies and long-duration breastfeeding were most protective factors. History of abortion and age of menses had no effect.
7: Mahue (3/03) – 744 breast cancer patients.
Retroactive study.
Finding: Breast cancer after giving birth not related to miscarriage or induced abortion. Among women who never gave birth, risk was lower with history of an induced abortion (“although the risk estimate was imprecise.)” “Risk declined as the number of induced abortions increased (P = 0.04). Our results do not support the hypothesis that induced abortion or miscarriage increase the breast cancer risk of young women.”
8: Erlandsson – (2/03). All Swedish women giving birth 1973-1991.
Prospective case-control study.
Finding: “In conclusion, neither a history of induced nor spontaneous abortions is associated with an increased risk of breast cancer. Our data suggest a protective effect of pregnancies regardless of outcome.”
Now, note this study. It SPECIFICALLY investigated the hormonal effect. What they specifically studied was this:
“”””It has been suggested that abortions leave the breast epithelium in a proliferative state with an increased susceptibility to carcinogenesis.””””
In other words, that hormonal effects on the breast from inducing abortions or from interrupting pregnancy makes the woman more susceptible to breast cancer. And, of course, their finding STILL showed this not to be the case. This was a case-control study, as accurate as they get. Those of you who question the hormone issue, go read this study.
9: Ye (10/02). 267,040 women, 652 (or more)
Prospective, randomized case-control study.
Breast cancer not associated with abortions, with number of abortions, or with abortions after first birth. They have this comment, though” Few women had undergone an abortion after 13 weeks gestation or before their first child. Although increases in risk were observed in such women, they were not statistically significant and could have been due to recall bias.”
10: Chaudry (4/02) – 245 African-American families.
Prospective epidemiological study of specific breast cancer gene.
Finding: “This putative gene was found to interact significantly with age at menarche (P = 0.048), and an interaction with a history of spontaneous abortions was suggested (P = 0.08). A late age at menarche increased BC risk in gene carriers but had a protective effect in non-gene carriers. A history of spontaneous abortions had a protective effect in gene carriers and increased BC risk in non-gene carriers.”
11: Davidson (12/01) – Review of all articles.
Review Article
Finding: “Over recent years, concerns have been raised about a possible causal relation between induced abortion and subsequent breast cancer”….” refuting this hypothesis and concludes that there are, to date, insufficient data to justify warning women of future breast-cancer risk when counselling them about abortion”
This article ALSO mainly looked at the issue of hormonal changes
12: Sanderson (6/01) – 1459 breast cancer patients
Prospective epidemiological study
Finding: there was no relation between ever having had an induced abortion and breast cancer
13: Newcomb (10/00). 252 breast cancer patients
Prospective case-control study.
Finding: No connection between breast cancer and induced or spontaneous abortion in women, whether they ever gave birth or not.
14: Tang (3/00) 463 breast cancer patients and controls.
Case-controlled cohort study
Finding: Induced abortion in women who later give birth does not cause risk for breast cancer.
And for good meassure, here is that Cancer Society link again:
http://www.cancer.org/docroot/CRI/c...tion_Cause_or_Contribute_to_Breast_Cancer.asp
What the Experts Say
In February 2003, the US National Cancer Institute (NCI) convened a workshop of over 100 of the world’s leading experts who study pregnancy and breast cancer risk. The experts reviewed existing human and animal studies on the relationship between pregnancy and breast cancer risk, including studies of induced and spontaneous abortions. Among their conclusions were:
Breast cancer risk is transiently (temporarily) increased after a term pregnancy [resulting in the birth of a living child].
Induced abortion is not associated with an increase in breast cancer risk.
Recognized spontaneous abortion is not associated with an increase in breast cancer risk.
The level of scientific evidence for these conclusions was considered to be "well established" (the highest level).