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The clinical case presented refers to a woman suffering from metastatic breast cancer treated with sacituzumab govitecan (SG) who has a long progression-free survival. The case is characterized by the extreme aggressiveness of the neoplastic disease that relapses during adjuvant hormonal treatment with a metastatic disease that presents immunohistochemical characteristics different from the primary tumor. After first-line therapy with nabpaclitaxel and atezolizumab and the subsequent one with carboplatin and gemcitabine, both characterized by short PFS, the third line with SG is characterized by obtaining a complete response and a prolonged PFS as well as extreme tolerability that continues to this day after 15 months of treatment.