3958
Here , we review some newly identified putatively targetable ER partners and highlight the need to develop tumor - targeting drug carrier systems affecting both the tumor cells and the tumor environment .
 None
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:  
Answer:
 None