13051
R8 - functionalized liposomes ( R8 - Dox - L ) markedly increased the intracellular and intratumoral delivery of doxorubicin as measured by flow cytometry and visualizing by confocal laser scanning microscopy ( CLSM ) compared to unmodified Doxorubicin - loaded PEGylated liposomes ( Dox - L ) .
 Dox, doxorubicin, Doxorubicin, Dox
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Dox, doxorubicin, Doxorubicin, Dox