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To define the possible role of the VHL gene in the development of sporadic renal cell carcinomas , 91 different parenchymal tumours of the kidney have been investigated for mutation of the VHL gene by single strand conformation polymorphism ( SSCP ) and / or heteroduplex ( HD ) techniques .
 Disease: VHL; Disease: sporadic renal cell carcinomas; Disease: parenchymal tumours of the kidney; Disease: VHL
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: sporadic renal cell carcinomas; Disease: parenchymal tumours of the kidney; Disease: VHL