9649
Magnetic resonance imaging ( MRI ) of both tumors showed that PPTT was capable of improving the tumor mass penetration of HPMA copolymers .
 Chemical: HPMA
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: HPMA 
Answer:
 Chemical: HPMA