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5 - Fluorouracil ( 5 - FU ) is used to treat many aggressive cancers , such as those of the colon , breast , and head and neck .
 5 - Fluorouracil, 5 - FU
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 5 - Fluorouracil, 5 - FU