All patients reported having eBC at diagnosis and 84.7 % still had a local BC at the time of the survey, 62.2 % were diagnosed with HER2+ eBC two or more years earlier, 11.9 % self-reported their current BC stage to be metastatic and 67.7 % were undergoing BC treatment at the time of the survey (Table 1). Here, ERBB2 is linked to breast cancer.