24540
Improvements in pathological complete response ( pCR ) rates and progression free survival ( PFS ) in preoperatively treated and metastatic human epidermal growth factor 2 ( HER2 ) - positive breast cancer , respectively , have been observed with combinations of anti - HER2 therapies given concomitantly .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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