17860
MATERIAL & METHODS : We performed a meta - analysis using PubMed , of randomized control trials ( RCTs ) , cohorts , and case - control studies published through July 2012 that assess effects of metformin and / or sulfonylurea sulfonylureas on cancer risk at any site , in subjects with T2DM .
 metformin, sulfonylurea, sulfonylureas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 metformin, sulfonylurea, sulfonylureas