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Well-differentiated endometrial adenocarcinoma of the secretory type (FIGO Grade 1) with minimal myometrial invasion occurred in a postmenopausal patient on tamoxifen therapy 5 years after mastectomy for breast carcinoma.
 adverse event: occurred 
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: occurred 