RESUMEN
To describe our diagnostic and therapeutic strategy against synchronous, bilateral breast cancer during the pregnancy. Gestational age at diagnosis of cancer was 7; 21 and 25 weeks respectively. Patients had stage IV and IIIA of breast cancer in two and one case respectively. They all received chemotherapy, two cases during pregnancy (6TEC and 3AC) and one case after delivery. Bilateral mastectomy was performed in one case. One patient died. The others were alive but all metastatic. Fetal growth restriction was noted in one case. This association leads to delayed diagnosis of cancer. Surgery is feasible and the type of intervention is only determined by the cancer stage. Chemotherapy is feasible and is associated with less foetal complications in the last two quarters of pregnancy.