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The samples were transferred to Kyushu University Hospital ( Beppu , Japan ) where they were analyzed by quantitative real - time reverse transcription - PCR for three epithelial cell markers , carcinoembryonic antigen , cytokeratin - 19 , and cytokeratin - 7 , as well as VEGFR - 1 .
 samples, epithelial cell
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 samples, epithelial cell