Sentinel Lymph Node Biopsy After Neoadjuvant Chemotherapy in IBC

Inclusion Criteria: * Female patients over 18 years of age with clinically and biopsy-proven stage IIIB cT4d cN0-2 M0 breast cancer as assessed by clinical exam and imaging * Patients receiving NACT and having a nodal complete clinical response (ycN0) as assessed by physical exam and imaging (ultrasound and PET) * Ability to understand and willingness to sign informed consent document and comply with study procedures Exclusion Criteria: * Patients with cN3 stage at diagnosis * Participants with stage IV (metastatic) breast cancer * Participants with positive contralateral axillary nodes identified on standard imaging studies (mammograpy, MRI, ultrasound) and cito-histologically ascertained * Patients with a prior history of ipsilateral breast cancer * Pregnant patients * Patients after NACT with persistent palpable axillary nodes, as assessed by physical exam, or with persistent pathological axillary nodes, as assessed by imaging * Patients not consenting to ALND