12764
In xenograft mouse models transplanted with BG - 1 cells , BP - 1 or E2 treatment significantly increased the tumor mass formation compared to a vehicle ( corn oil ) within 8 weeks .
 Chemical: BP - 1
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: BP - 1 
Answer:
 Chemical: BP - 1