5461
In addition to having a direct effect on tumor cells , vitamins such as alpha - tocopheryl succinate and beta - carotene enhance the effect of other agents that induce differentiation in tumor cells .
 tumor cells, tumor cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 tumor cells, tumor cells