28890
A study of the cytotoxicity of Bcl - xL siRNA and DOX co - encapsulated PSomes ( CPSomes ) shows more inhibited proliferation of MKN - 45 and MKN - 28 human gastric cancer cell lines than only gene - and drug - loaded ones .
 DOX
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 DOX