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We undertook an open - label study using thalidomide 100 mg once daily for up to 6 months in 20 men with androgen - independent prostate cancer .
 Chemical: thalidomide; Chemical: androgen; Disease: prostate cancer
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: thalidomide; Chemical: androgen; Disease: prostate cancer