1693
Although its side effects are few, tamoxifen increases the incidence of proliferative lesions of the endometrium, which theoretically should be preventable with progestational agents.
 adverse event: increases 
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: increases 