3890
Moreover , treatment with the DNA methyltransferase inhibitor 5 - Aza - 2 ' - deoxycytidine upregulated NDRG1 expression in gastric cancer HGC27 cells , but not in the histone deacetylase inhibitor trichostatin A - treated HGC27 cells .
 5 - Aza - 2 ' - deoxycytidine, trichostatin A
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 5 - Aza - 2 ' - deoxycytidine, trichostatin A