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We propose that the loss of wild - type VHL gene results in a specific cellular defect in serum - dependent growth control , which may initiate tumor formation .
 Disease: VHL; Disease: tumor
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: VHL; Disease: tumor