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The proportion of trastuzumab+ (combination of trastuzumab and chemotherapy) patients out of all HER2-positive (HER2+) patients.
Note: The number of HER2+ patients and patients treated with trastuzumab (trastuzumab+) increased gradually each year from 2007 to 2011.
Abbreviation: HER2, human epidermal growth factor receptor 2.
