Overall, most patients were married (2834 patients [63.8%]), privately insured (2650 patients [59.4%]), and had stage I disease (2814 patients [63.1%]), HR-positive/ERBB2-negative breast cancers (2753 patients [61.7%]), and no comorbidities (3520 patients [78.9%]). Here, ERBB2 is linked to breast carcinoma.