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The appearance of MPO - ANCA in these cases was suspected of being related to PTU because the titres of MPO - ANCA decreased when PTU was stopped .
 Chemical: PTU; Chemical: PTU
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:
 Chemical: PTU; Chemical: PTU