Abstract
Seven thousand three hundred and seventeen women who visited the breast department at Nagano Cancer Center as first-time outpatients and underwent detailed breast examination during a 20-year period were divided into two groups according to the presence or absence of subjective symptoms.
Risk factors of breast cancer in these two groups were compared in terms of patient age at the time of the visit, and the following results were obtained.
1. The breast cancer detection rate in the age group with subjective symptoms was significantly higher than that in the group without such symptoms.
2. Irrespective of the presence or absence of subjective symptoms, the breast cancer detection rate tended to rise with increasing age.
3. Irrespective of the presence or absence of subjective symptoms, a family history of breast cancer, age at menarche, the number of live-born babies, and a history of artificial abortion were not revealed to be risk factors of breast cancer.
