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• W2083322543 abstract "The attempt to investigate the hypothesis of a link between abortion and breast cancer by the Collaborative Group in Hormonal Factors on Breast Cancer (Mar 27, p 1007)1Collaborative Group on Hormonal Factors in Breast CancerBreast cancer and abortion: collaborative reanalysis of data from 53 epidemiological studies, including 83 000 women with breast cancer from 16 countries.Lancet. 2004; 363: 1007-1016Summary Full Text Full Text PDF PubMed Scopus (181) Google Scholar should be commended for gathering together the co-operation of 53 different research teams. The investigators examined only the general associations between breast cancer and abortion at any point in a woman's life. They did not answer more specific concerns regarding the previously observed heightened risk of breast cancer when the abortion occurs during a first pregnancy, when the woman is younger than 18 years, and when the woman is younger than 18 years and has a family history of breast cancer.2Daling JR Malone DE Voigt LF White E Weiss NS Risk of breast cancer among young women: relationship to induced abortion.J Natl Cancer Inst. 1994; 86: 1584-1592Crossref PubMed Scopus (142) Google Scholar Without institution of proper controls for complete reproductive histories, a general analysis of such a large dataset can obscure rather than clarify these associations.Since the Collaborative Group on Hormonal Factors in Breast Cancer has now established access to such a large combined dataset, they should be able to definitively address these specific areas of concern. Identification of first pregnancy outcome is crucial; however, I would recommend restricting the analysis to the subset of women for whom all pregnancy outcomes can be retrieved from centralised medical records, which is the case with data from Denmark and some other countries. In the USA, complete reproductive history records could only be constructed in one state, New York, which has required filing of a fetal death certificate after abortion or miscarriage since the early 1970s. Cross-indexed with birth certificates, these fetal death certificates would provide a means of constructing complete reproductive histories for women with uninterrupted residency in New York.Greater credibility will be achieved with this proposed analysis if key advocates of the abortion-breast cancer hypothesis, such as Joel Brind,3Brind J Chinchilli VM Sever WB Summy-Long J Induced abortion as an independent risk factor for breast cancer: a comprehensive review and meta-analysis.J Epidemiol Comm Health. 1996; 50: 481-496Crossref PubMed Scopus (109) Google Scholar are invited to participate in the study design. Such an invitation would seem to be in the collaborative spirit of the group. The only way to assure both sides of this contentious issue that the data are being fully and properly analysed is to allow opposing advocates access to the same data. I look forward to an additional report from the Collaborative Group on this issue. The attempt to investigate the hypothesis of a link between abortion and breast cancer by the Collaborative Group in Hormonal Factors on Breast Cancer (Mar 27, p 1007)1Collaborative Group on Hormonal Factors in Breast CancerBreast cancer and abortion: collaborative reanalysis of data from 53 epidemiological studies, including 83 000 women with breast cancer from 16 countries.Lancet. 2004; 363: 1007-1016Summary Full Text Full Text PDF PubMed Scopus (181) Google Scholar should be commended for gathering together the co-operation of 53 different research teams. The investigators examined only the general associations between breast cancer and abortion at any point in a woman's life. They did not answer more specific concerns regarding the previously observed heightened risk of breast cancer when the abortion occurs during a first pregnancy, when the woman is younger than 18 years, and when the woman is younger than 18 years and has a family history of breast cancer.2Daling JR Malone DE Voigt LF White E Weiss NS Risk of breast cancer among young women: relationship to induced abortion.J Natl Cancer Inst. 1994; 86: 1584-1592Crossref PubMed Scopus (142) Google Scholar Without institution of proper controls for complete reproductive histories, a general analysis of such a large dataset can obscure rather than clarify these associations. Since the Collaborative Group on Hormonal Factors in Breast Cancer has now established access to such a large combined dataset, they should be able to definitively address these specific areas of concern. Identification of first pregnancy outcome is crucial; however, I would recommend restricting the analysis to the subset of women for whom all pregnancy outcomes can be retrieved from centralised medical records, which is the case with data from Denmark and some other countries. In the USA, complete reproductive history records could only be constructed in one state, New York, which has required filing of a fetal death certificate after abortion or miscarriage since the early 1970s. Cross-indexed with birth certificates, these fetal death certificates would provide a means of constructing complete reproductive histories for women with uninterrupted residency in New York. Greater credibility will be achieved with this proposed analysis if key advocates of the abortion-breast cancer hypothesis, such as Joel Brind,3Brind J Chinchilli VM Sever WB Summy-Long J Induced abortion as an independent risk factor for breast cancer: a comprehensive review and meta-analysis.J Epidemiol Comm Health. 1996; 50: 481-496Crossref PubMed Scopus (109) Google Scholar are invited to participate in the study design. Such an invitation would seem to be in the collaborative spirit of the group. The only way to assure both sides of this contentious issue that the data are being fully and properly analysed is to allow opposing advocates access to the same data. I look forward to an additional report from the Collaborative Group on this issue." @default.
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• W2083322543 title "Abortion and breast cancer" @default.
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• W2083322543 doi "https://doi.org/10.1016/s0140-6736(04)16375-7" @default.
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