[Retrospective analysis of metaplastic breast cancer cases].

Metaplastic breast tumour is a rare, aggressive, mostly triple- negative, dedifferentiated malignancy, which poorly responds to chemotherapy compared to other invasive breast tumours. Since 2000, the WHO has considered it as a separate entity among breast tumours. Given the extremely poor prognosis of the tumour, more studies are needed to establish the most effective treatment strategy supported by data to increase overall survival.