270
5-Fluorouracil (5-FU) is an analogue of pyrimidine nucleosides that is widely used in the treatment of head and neck, breast, ovarian, and colon cancer.
 potential therapeutic event: used 
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: adverse event, potential therapeutic event 
Text: {0} 
Answer:
 potential therapeutic event: used 