In 1976, 118,273 female nurses 30-55 years of age with no history of cancer completed a questionnaire regarding possible risk factors. By 1986, after 1,137,415 person-years of follow-up, we had documented 1,799 newly diagnosed cases of breast cancer. Compared with the risk of breast cancer for nonusers of oral contraceptives, the multivariate relative risks were 1.07 (95
作者:I, Romieu;W C, Willett;G A, Colditz;M J, Stampfer;B, Rosner;C H, Hennekens;F E, Speizer
来源:Journal of the National Cancer Institute 1989 年 81卷 17期