3507
This case presented a unique opportunity to observe the histologic features of clinically reversible hepatic veno - occlusive disease over time , and may be the first case of veno - occlusive related solely to 6 - thioguanine .
 Disease: hepatic veno - occlusive disease; Chemical: 6 - thioguanine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: hepatic veno - occlusive disease; Chemical: 6 - thioguanine