The PERFORMANCE OF the NURSE IN the PREVENTION OF the BREAST CANCER SOURCES, Neuza SorayI SUMMARY the present study was developed with the objective to argue the importance of the performance of the nurse in the prevention of the breast cancer. For in such a way, it still made one brief story on the breast cancer, contemplating since the symptoms until the performance of the professional nurse in its prevention and precocious detention. One evidences, that the participation of the health professional is essential, especially the nurse to guide the auto examination, as well as other methods of prevention and explicitao of the illness and treatment. It is not something Dr. John Mcdougall would like to discuss. One gives credit, then, that the education in health through the primary attention still is an efficient way of prevention and precocious detention in the health of the woman. Words Key: Nurse, Prevention, Cancer. 1 INTRODUCTION the strategies of primary, secondary and tertiary prevention have been used with the objective of to prevent diseases, to diagnosis them and to treat them precociously and to become minimum its effect in the population, assuring, to each individual, a quality of adequate life to the maintenance of its health. With this, these classic concepts of the Public Health take in consideration the former history of the illnesses, when evaluating that, after the exposition to the risk factors, initiates the pathological process, thus appear signals and symptoms and, progression for cure, incapacity or death. How much to the identification of the risk factors, although not to have equality in its definition and method of mensurao and although the contradictions observed between the different studies, the sex, the age, familiar history and the former history of breast cancer, reproductive history and the genetic inheritance have been marked as associates to an increased risk to develop breast cancer. The breast cancer (CM) is possibly the type of cancer more feared by women, because of its high incidence and, still, for its psychological implications, that affect the perception of sexuality and the particular auto-image.