Lymph Node Identification Using Magtrace and Magseed Before Chemotherapy

Inclusion criteria: * Patients 18 years of age or older. * Patients with breast cancer planned to undergo NACT with * planned sentinel lymph node dissection (SLND), or * targeted axillary lymph node dissection (TAD), in conjunction with the * breast surgery after NACT. Exclusion Criteria: * Intolerance / hypersensitivity to iron or dextran compounds or SPIO. * Patients who are required to undergo MRI to evaluate tumour response. * Pregnancy or breast feedin.g * Patients with an iron overload disease. * Patient deprived of liberty or under guardianship. * Inability to understand given information and give informed consent or undergo study procedure