All patients affected by newly diagnosed, clinically N-positive BC that have already undergone a baseline 2-deoxy-2-\[fluorine-18\]fluoro-D-glucose (18F-FDG) PET/CT (T1) will be screened for eligibility. Patients who will meet all inclusion/exclusion criteria will be considered eligible and asked to participate to the study after signing the informed consent form. Patients' eligibility will be evaluated by the referent nuclear medicine physician (T2). Considering the clinical experience of the investigators, we expect to complete patient enrolment in 12 months after study accrual
