3273
Thus , there is no evidence that the paternal RB1 allele is preferentially retained in retinoblastoma , as has been suggested to be the case in osteosarcoma .
 retinoblastoma, osteosarcoma
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 retinoblastoma, osteosarcoma