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The incidence of the variability of the free PSA / total PSA ratio on the early diagnosis of prostate cancer
 GENE: PSA; GENE: PSA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: PSA; GENE: PSA