1375
The most significant results concerning clinical benefit might come from detailed immunologic investigations made during well designed clinical trials of dendritic - cell - based therapies , which in general prove safe .
 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