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We have previously shown that methotrexate ( MTX ) conjugated to a cancer - specific poly amido amine ( PAMAM ) dendrimer has a higher therapeutic index than MTX alone .
 Chemical: methotrexate; Chemical: MTX; Chemical: poly amido amine; Chemical: PAMAM; Chemical: MTX
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: methotrexate; Chemical: MTX; Chemical: poly amido amine; Chemical: PAMAM; Chemical: MTX