1060
Nested within the cohort , a matched case - control study was performed to estimate the association between cyclophosphamide and bladder cancer using odds ratios ( ORs ) as relative risk .
 cyclophosphamide, bladder cancer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 cyclophosphamide, bladder cancer