Breast cancer and oral contraceptives: findings in Royal College of General Practitioners' study.
- 27 June 1981
- Vol. 282 (6282), 2089-2093
- https://doi.org/10.1136/bmj.282.6282.2089
Abstract
The incidence of breast cancer was studied among women taking part in the continuing cohort study organised by the Royal College of General Practitioners. An overall relative risk of 1.19 (not significant) was found in those who had used oral contraceptives. The risk ratio in women under 35 years old was 2.81, but this too was not significant. There was evidence that the estimated increased risk for younger women could be a chance occurrence. No convincing evidence of any adverse effects of oral contraceptives on breast cancer has been shown, but because of the long latent period of this tumour there is a need for longer observation.Keywords
This publication has 16 references indexed in Scilit:
- Cancer risk as related to use of oral contraceptives during fertile yearsCancer, 1977
- Design and analysis of randomized clinical trials requiring prolonged observation of each patient. II. Analysis and examplesBritish Journal of Cancer, 1977
- Oral Contraceptives and Reduced Risk of Benign Breast DiseasesNew England Journal of Medicine, 1976
- ESTIMABILITY AND ESTIMATION IN CASE-REFERENT STUDIESAmerican Journal of Epidemiology, 1976
- The Epidemiology of Cancers of the Breast and Reproductive SystemScottish Medical Journal, 1975
- Oral Contraceptives as Related to Cancer and Benign Lesions of the Breast 2JNCI Journal of the National Cancer Institute, 1975
- An Epidemiologic Study of Breast Cancer2JNCI Journal of the National Cancer Institute, 1974
- Etiology of Human Breast Cancer: A Review2JNCI Journal of the National Cancer Institute, 1973
- The pill, estrogens, and the breast.Epidemiologic aspectsCancer, 1971
- Age at first birth and breast cancer risk.1970