2288
Bcl - 2 expression in the tumor cells showed a reverse relation with tumor size ( P = 0 . 018 ) , histological grade ( P = 0 . 04 ) , and stage ( P = 0 . 013 ) .
 tumor cells, tumor
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