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Methotrexate (MTX) is a commonly used second line agent for RA, and there have been several recent reports of Epstein-Barr virus (EBV)-associated polyclonal B cell lymphoproliferative disorder in MTX-treated RA patients.
 adverse event: reports 
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:
 adverse event: reports 