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There have been several long - term studies of patients with rheumatoid arthritis treated with azathioprine and cyclophosphamide and the incidence of most of the common cancers is not increased .
 rheumatoid arthritis, azathioprine, cyclophosphamide, cancers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 rheumatoid arthritis, azathioprine, cyclophosphamide, cancers