11948
( - ) - Xanthatin up - regulation of the GADD45 gamma tumor suppressor gene in MDA - MB - 231 breast cancer cells : role of topoisomerase II alpha inhibition and reactive oxygen species .
 Chemical: ( - ) - Xanthatin; Chemical: oxygen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: ( - ) - Xanthatin; Chemical: oxygen