25580
In the tissue culture , it showed about a 6 - fold increase in its IC50 in MCF - 7 after the irradiation , most likely , because of the released CA4 .
 Chemical: CA4
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: CA4