Clinical Research Directory

Inclusion Criteria * Participants diagnosed with HER2-low breast cancer, defined as IHC score 1+ or 2+ and not amplified at in situ hybridization (ISH) test as confirmed by local laboratory testing. * Participants should be at advanced or metastatic setting prior to treatment. * Written informed consent (Accordo di Partecipazione alla Ricerca Scientifica) and specific informed consent to the study must be signed and dated by the patient and the doctor prior to inclusion. * Patients must be accessible for follow-up.