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The frequency , origin , and phenotypic expression of a germline MSH2 gene mutation previously identified in seven kindreds with hereditary non - polyposis cancer syndrome ( HNPCC ) was investigated .
 hereditary non - polyposis cancer syndrome, HNPCC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 hereditary non - polyposis cancer syndrome, HNPCC