5131
The RB1 gene from 12 human retinoblastoma tumors has been analyzed exon - by - exon with the single - strand conformation polymorphism technique .
 retinoblastoma tumors
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 retinoblastoma tumors