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A central question , given the therapeutic gains enabled by further suppression of the androgen axis with these newer agents , is whether there may be additional clinical benefit gained by moving the goal posts of androgen suppression even further .
 androgen, androgen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 androgen, androgen