[Statistic analysis of some risk factors in breast cancer]

We have tried to establish a possible connection between breast cancer and a series of individual factors: age of the menopause, woman's age at the first delivery, number of pregnancies and the number of born children, the age when the first symptom appeared (mammary tumor), environment, hereditary and collateral antecedents. The data have been analysed with the help of statistics methods and electronic computer programmes used to solve most complex problems. The conclusions regarding some risk factors, dependent on the statistic behaviour of the elements analysed, indicate a maximum frequency of the neoplasm incidence immediately after menopause, an increased risk for the aged primiparas and the protecting role of an early pregnancy, as well as a bimodal aspect of the frequency of this disease depending on the age at which the first symptom appears and the age of the menopause, with two maximums, the principal one placed within the first ten years after the setting in of menopause, and the second one occuring at about twenty years after menopause.