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DNA microarray analysis of treated tumor xenografts revealed significantly decreased expression of genes regulating glucose and thymidine metabolism and revealed changes in apoptotic genes , suggesting that the imaging tracers FDG , 3 - deoxy - 3 - [ ( 18 ) F ] fluorothymidine , and annexin V could serve as potential imaging biomarkers for RAF265 therapy monitoring .
 tumor xenografts
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 tumor xenografts