8202
The literature review was conducted using a PubMed search with the fixed term ' defibrotide ' in combination with >= 1 of ' safety ' , ' veno - occlusive disease ' ( with and without ' treatment ' , ' prevention ' ) , ' oncology ' , ' myeloma ' , ' microangiopathy ' , ' anti - thrombotic ' and ' peripheral vascular disorder ' .
 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