[Breast cancer during pregnancy. Epidemiology--diagnosis--prognosis].

The association "breast cancer and pregnancy" is rare. The hypervascularisation of the pregnant breast, the role of hormones, the immunological factors have been incriminated. The rate of diagnosis is often too late because of the changes in the pregnant breast. Among the investigations, besides mammogram, the interest of ultrasound examination especially cyto-punction is underlined. Prognosis appears more severe because the delay in diagnosis and the young age of patients. However that is true for N+ patterns, and not for N- cases. We detail the experience of the Centre des Maladies du Sein de l'Hôpital Saint-Louis which concerns 15 cases.