2802
At the same time , HER2 assessment is also of importance because successful anti - tumor treatment with Herceptin (R) is strongly correlated with HER2 overexpression in the tumor ( approximately 30 % of all breast tumors overexpress HER2 ) .
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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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