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The association of the tumor with preexisting hydroureteronephrosis suggests that stasis prolonged and intensified exposure of upper urinary tract epithelium to cyclophosphamide .
 Disease: tumor; Disease: hydroureteronephrosis; Chemical: cyclophosphamide
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: tumor; Disease: hydroureteronephrosis; Chemical: cyclophosphamide