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Chemotherapy with or without trastuzumab received between 2000 and 2009 (A) the percentage of patients with human epidermal growth factor receptor 2 (HER2)-positive disease receiving chemotherapy and (B) patients with HER2-negative disease, subdivided into (B1) the percentage of patients with HER2-negative, hormone receptor (HR)-positive disease receiving chemotherapy and (B2) the percentage of patients with HER2-negative/HR-negative disease receiving chemotherapy.
