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All-trans-retinoic acid (ATRA) has been proved to be an effective treatment for acute promyelocytic leukemia (APL), inducing remission in more than 90% of cases.
 potential therapeutic event: proved 
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: proved 