Abstract
Two trials of mass screening for breast cancer using mammography were carried out in Tokushima prefecture. In half of the mammographic examinations, breast cancer was detected as a mass shadow. This finding suggests that detection of a mass shadows is important for breast cancer screening using mammography. In addition, we examined the detection rate of breast cancer according to age and the mammographic parenchymal pattern according to age, and on the basis of our results, we considered mass screening using mammography to be suitable for asymptomatic women aged 50 years or more in Japan.
