2009
After 24 weeks treatment with vildagliptin , the patients were classified into a responder group ( 69 . 2 % ) and a non - responder group ( 30 . 8 % ) ; the responders consisting of subjects whose HbA1c decreased following 24 weeks treatment with vildagliptin , and the non - responders consisting of subjects who did not show any significant decrease of HbA1c .
 vildagliptin, vildagliptin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 vildagliptin, vildagliptin