[Co-expression of estrogen receptors and Her2/neu in breast cancer. Neoadjuvant chemotherapy sentinel lymph node and hormonotherapy]. / Cancer de mama con Her-2-neu y receptores hormonales positivos. Quimioterapia neoadyuvante, biopsia de ganglio centinela y tratamiento hormonal.

Neoadjuvant chemotherapy is an interesting option in the therapy of some breast cancer cases. Cases in which the timing for sentinel lymph node biopsy is controversial. Co-expression of estrogen receptors and Her2/neu (c-erbB-2) in breast cancer may imply hormone resistance, especially to tamoxifen. We present a clinic case with co-expression of estrogen receptors and Her2/neu that was treated with neoadjuvant chemotherapy and previous sentinel lymph node biopsy followed by breasttumorectomy with axillar lymphadenectomy, radiotherapy and hormonotherapy with letrozol, geserelina and trastuzumab. A good treatment response was found.