Breast cancer (BC) is one of the pressing medical and social problems of modern oncology due to the prevalence and psychological aspects associated with the problems of social adaptation. More than 1.3 million disease cases are registered annually in the world. In Russia, breast cancer has been the leading pathology in the structure of malignant neoplasms in the female population of late reproductive age since 1985. Malignant tumours of the mammary gland occupy a leading position in determining the level of temporary and permanent disability, reduce the average life expectancy of the female population, and cause irreparable economic damage to society. Late diagnosis of breast cancer, a large proportion of standard disease stages (41.9%), and high one-year mortality (10.9%) determine the importance of measures for early diagnosis. Therefore, an urgent issue is preventive measures substantiation for breast cancer based on the study of women’s risk factors in late reproductive age.