Breast cancer and abortion: collaborative reanalysis of data from 53 epidemiological studies, including 83 000 women with breast cancer from 16 countries

@article{Beral2004BreastCA,
  title={Breast cancer and abortion: collaborative reanalysis of data from 53 epidemiological studies, including 83 000 women with breast cancer from 16 countries},
  author={Valerie Beral and Diana Bull and Richard Doll and Richard Peto and Gillian K. Reeves},
  journal={The Lancet},
  year={2004},
  volume={363},
  pages={1007-1016}
}
BACKGROUND The Collaborative Group on Hormonal Factors in Breast Cancer has brought together the worldwide epidemiological evidence on the possible relation between breast cancer and previous spontaneous and induced abortions. METHODS Data on individual women from 53 studies undertaken in 16 countries with liberal abortion laws were checked and analysed centrally. Relative risks of breast cancer--comparing the effects of having had a pregnancy that ended as an abortion with those of never… Expand
Breast cancer risk in relation to abortion: Results from the EPIC study
TLDR
Overall, the findings provide further unbiased evidence of the lack of an adverse effect of induced abortion on breast cancer risk, and there was some evidence of a slight increase in the risk of breast cancer among women who reported having had 2 or more spontaneous abortions. Expand
Breast cancer and abortion.
  • R. Lea
  • Medicine
  • Journal of obstetrics and gynaecology Canada : JOGC = Journal d'obstetrique et gynecologie du Canada : JOGC
  • 2005
In a collaborative reanalysis of data from 53 epidemiologic studies that included 83 000 women with breast cancer from 16 countries, the overall relative risk (RR) of breast cancer for women havingExpand
Induced abortion as an independent risk factor for breast cancer: a systematic review and meta-analysis of studies on south asian women.
TLDR
The moderately strong association identified between abortion and breast cancer explains in part the spread of the breast cancer epidemic to South Asia as it has become Westernized. Expand
Abortion and Breast Cancer re : “ collaborative reanalysis of data ” published in
The paper in the Lancet entitled “a collaborative reanalysis of data from 53 epidemiological studies, including 83,000 women with breast cancer from 16 countries”, by Valerie Beral et al. 1 , is anExpand
Induced abortions and the risk of all cancers combined and site-specific cancers in Shanghai
TLDR
There was a significant reduction in risk of uterine corpus cancer in women who had ever had an induced abortion, and a significant decreasing trend in risk with increasing number of induced abortions, and no convincing associations with other cancers were observed. Expand
Induced Abortion and Breast Cancer.
TLDR
The basic human biology of breast maturation through pregnancy is the basis of the abortion breast cancer link and an understanding of the biological basis of breast cancer risks makes it possible to understand, predict and minimize those risk factors which will affect a womans future risk of breastcancer. Expand
Risk of breast cancer after miscarriage or induced abortion: a Scottish record linkage case-control study
TLDR
These data do not support the hypothesis that miscarriage or induced abortion represent substantive risk factors for the future development of breast cancer. Expand
Abortion and breast cancer: case-control study.
TLDR
The authors' study suggests that even short pregnancies ending in abortion add to the protection against breast cancer, and it seems that these associations did not depend on the number of abortions, age at first abortion, or gestational age atfirst aborted pregnancy. Expand
Abortion and Breast Cancer: Case-Control Study
Aims and background The aim of the present study was to examine if certain aspects of a woman's experience of abortion might be associated with the risk of breast cancer. Methods and study design TheExpand
Association between abortion and breast cancer: an updated systematic review and meta-analysis based on prospective studies
TLDR
The current prospective evidences are not sufficient to support the positive association between abortion (including IA and SA) and breast cancer risk, and the combined relative risks (RRs) and corresponding 95 % confidence intervals (95 % CIs) were not sufficient. Expand
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References

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Abortion history and breast cancer risk: Results from the Shanghai breast cancer study
TLDR
It is suggested that a history of several induced abortions has little influence on breast cancer risk in Chinese women. Expand
Induced abortion and the risk of breast cancer.
TLDR
Induced abortions have no overall effect on the risk of breast cancer and no increases in risk were found in subgroups defined according to age at abortion, parity, time since abortion, or age at diagnosis of Breast cancer. Expand
Induced abortion and breast cancer risk.
TLDR
Since most women in this cohort were beyond their reproductive years when abortion became legal in 1973, the low prevalence of induced abortion argues for a cautious interpretation. Expand
Abortions and breast cancer: Record‐based case‐control study
TLDR
Neither a history of induced nor spontaneous abortions is associated with an increased risk of breast cancer, and the data suggest a protective effect of pregnancies regardless of outcome. Expand
Breast cancer and breastfeeding: collaborative reanalysis of individual data from 47 epidemiological studies in 30 countries, including 50 302 women with breast cancer and 96 973 women without the disease
TLDR
The longer women breast feed the more they are protected against breast cancer, and the lack of or short lifetime duration of breastfeeding typical of women in developed countries makes a major contribution to the high incidence of breast cancer in these countries. Expand
Abortion and breast cancer risk
TLDR
A lack of association between induced and spontaneous abortions and breast cancer risk is indicated and no significant relationship was found between the risk of breast cancer and history of spontaneous or induced or total abortions in separate strata of age at diagnosis. Expand
Risk of breast cancer among young women: relationship to induced abortion.
TLDR
The data support the hypothesis that an induced abortion can adversely influence a woman's subsequent risk of breast cancer, but the results across all epidemiologic studies are inconsistent. Expand
Breast cancer in relation to induced abortions in a cohort of Chinese women
TLDR
There was also no overall increase in risk in women with induced abortion after first birth, and increases in risk were observed in such women, they were not statistically significant and could have been due to recall bias. Expand
Induced Abortion and Risk for Breast Cancer: Reporting (Recall) Bias in a Dutch Case-Control Study
TLDR
The authors conclude that reporting bias is a real problem in case-control studies of induced abortion and breast cancer risk if study findings are based solely upon information from study subjects. Expand
Risk of breast cancer among white women following induced abortion.
TLDR
The hypothesis that there may be a small increase in the risk of breast cancer related to a history of induced abortion among young women of reproductive age is supported. Expand
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