4427
The in vitro antitumor activity of the target compounds has been evaluated against HCT - 116 , MCF - 7 , K562 , and SGC - 7901 cell lines .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None