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Treatment was comprised of VNB , 25 mg / m ( 2 ) , plus GEM , 1000 mg / m ( 2 ) , both on Days 1 , 8 , and 15 every 28 days .
 VNB, GEM
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 VNB, GEM