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In hereditary retinoblastoma , different epidemiological studies have indicated a preferential paternal transmission of mutant retinoblastoma alleles to offspring , suggesting the occurrence of a meiotic drive .
 hereditary retinoblastoma, retinoblastoma
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 hereditary retinoblastoma, retinoblastoma