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The results indicate that tumor tissue of RCC liberates VEGF into the systemic blood flow and that s - VEGF is a possible marker for RCC .
 tumor tissue, RCC, blood, RCC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 tumor tissue, RCC, blood, RCC