© 1993 Oxford University Press
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Family History of Breast, Ovarian and Endometrial Cancer and Risk of Breast Cancer
* Istituto di Ricerche Farmacologiche ‘Mario Negri’ via Eritrea 62 20157 Milan, Italy
** I Clinica Ostetrico Ginecologica, Universitá di Milano Milan Italy
Institute of Social Preventive Medicine, University of Lausanne 1005 Lausanne, Switzerland
Centro di Riferimento Oncologico, via Pedemontana Occidcntale 33081 Aviano, Pordrnone, Italy
The relationship between family history of breast, ovarian and endometrial cancer and risk of breast cancer was analysed using data from a case-control study of breast cancer conducted in the greater Milan area, Northern Italy. The cases studied were 3415 women (median age 52 years, range 23–74) who had histdogically confirmed breast cancer diagnosed within the year precedmg the interview. The controls were 2916 women (median age 54 years; range 21–74] In hospital for a spectrum of acute illnesses excluding gynaecological, hormonal or neoplastic conditions. A total of 375 cases (11.0%) and 128 controls (4.4%) reported a history of breast cancer in first degree relatives. Compared with women with no family history of breast cancer, the RR was 2.7 (95% confidence Interval [CI] : 2.2–3.3) in those with one first degree relative affected and 2.8 (95% CI : 1.3–5.7) in those with two or more affected relatives. In comparison with women without family history of ovarlan cancer the RR of breast cancer was 1.4 (95% CI : 0.9–2.3) for those reporting one or more first degree relatives with ovarian cancer. However, the multivariate estimate for family history of ovarian cancer, including a term for familial breast cancer, decreased to 0.8 (95% CI : 0.5–1.4). The risk of breast cancer was similar in women reporting a family history of breast cancer (RR=2.2) and in those reporting a family history of both breast and ovarian cancer (RR=2.51, in cornparkon with women reporting no family history of breast and/or ovarian cancer. When tlia relation with family history of breast cancer was analysed in strata of women with and without family history of ovarian cancer, no difference was found in the RR estimates: the RR for family history of breast cancer was 2.8 in women with family history of ovarian cancer and 2.7 in those without history of ovarian cancer. No relation was found between history of endometrial cancer in first degree relatives and risk of breast cancer.
Revised 1 February 1993
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