11513
The therapeutic effect of arsenic trioxide ( As2O3 ) in the treatment of acute promyelocytic leukemia ( APL ) was evaluated among 15 APL patients at relapse after all-trans retinoic acid ( ATRA ) induced and chemotherapy maintained complete remission ( CR ).
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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:
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