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Therefore , both recombinant B . bauhinoides cruzipain inhibitor and recombinant B . bauhinioides kallikrein inhibitor might be considered for further studies to block peptidase activities in order to target specific peptidase - mediated growth and invasion characteristics of individual tumors , mainly in patients resistant to 5 - fluorouracil chemotherapy .
 Chemical: 5 - fluorouracil
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: 5 - fluorouracil