5155
Slight variations are caused by drug treatment in tumor - bearing mice as compared with untreated tumor - bearing controls ; the pattern of effects of the selective antimetastatic agents does not differ from that of the reference cytotoxic compound used , cyclophosphamide .
 tumor, tumor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 tumor, tumor