11743
Risk of biochemical recurrence was elevated among alpha - blocker users ( HR 1 . 68 , 95 % CI 1 . 37 - 2 . 06 ) , but in sensitivity analyses this was evident only in men using alpha - blockers after prostatectomy .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None