25800
Androgens and the androgen receptor have been the focus of prostate cancer research since the early 1940s , when Huggins and Hodges demonstrated that removal of androgens caused advanced prostate cancer to regress .
 Androgens, androgen, androgens
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Androgens, androgen, androgens