In the past, pregnancy-associated breast cancer was thought to have a fatal prognosis. However, when they are comparable in terms of tumor size, nodal status, and other established prognostic markers, pregnant and nonpregnant breast carcinoma patients have more recently been found to have a similar course. Nonetheless, the stage found at the time of the initial diagnosis is often more advanced in pregnant women. It is recommended that surgery should be performed in these patients in the same way as if they were not pregnant, while radiotherapy should be postponed until after delivery. The timing of administration is important in selection of the agent for any chemotherapy. Data on endocrine treatment during pregnancy is extremely scarce, and such therapy should therefore not be implemented until after delivery.