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High - dose intravenous melphalan followed by peripheral blood stem cell transplant ( PBSCT ) appears to be the most promising therapy , but treatment mortality can be high .
 Chemical: melphalan
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: melphalan