3758
Many mammary tumors induced by mouse mammary tumor virus ( MMTV ) contain a provirus in the same region of the host - cell genome , leading to expression of a putative cellular oncogene called int - 1 .
 int - 1
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 int - 1