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
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: ( - ) - Xanthatin, oxygen 
Answer:
 Chemical: ( - ) - Xanthatin; Chemical: oxygen