Female breast cancers incidence in the Romagna Unit of the Emilia-Romagna registry (n. 10,711) were grouped into: HR+ /HER2–, HR+ /HER2+ , HR–/HER2+ , HR–/HER2– and missing, and by age: < 50, 50–69 and 70+ years. Here, ERBB2 is linked to breast cancer.