RESUMO
A decision regarding adjuvant chemotherapy in early (operable) breast cancer in the past was made entirely on the basis of clinical and pathological features. However with the growing awareness of tumor biology and the possibility of the genomic analysis to determine the molecular subtypes of breast cancer it is getting real to identify patients whose tumors are resistant to chemotherapy or vice versa benefit from its addition. Despite the fact that genomic analysis allows some patients avoiding chemotherapy (especially patients with localized breast cancer), such studies do not indicate the most appropriate chemotherapy regimens. Therefore treatment decisions should be based on a combination of biological features of the tumor, its stage and signs that characterize the patient such as age and tolerance to the side effects of therapy.
