19115
Results of Kaplan - Meier survival analysis suggest that patients with metastatic gastric cancer ( mGC ) in the lowest quartile trough concentrations of trastuzumab in cycle 1 ( C ( min 1 ) ) had shorter overall survival ( OS ) than did those in other quartiles .
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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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