This is a prospective, single-center, open-label phase II clinical trial investigating the activity of EndoTAG-1 + paclitaxel combination therapy in patients with HER2-negative BC candidate for neoadjuvant chemotherapy, as measured by the decrease in MRI-estimated tumour volume at the end of EndoTAG-1 + paclitaxel administration. Patients will be stratified by hormone receptor status.