249
In view of the increasing use of antiestrogens in cancer therapy and prevention , there is obvious merit in long-term in vivo studies to be conducted.
 None
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 None