4010
A further study found that FGFR2 - positive fibroblasts were only observed inside the tumor tissues and not in tumor - surrounding stromal tissues , suggesting that FGFR2 could be used as a TF - specific marker in ESCC .
 FGFR2 - positive fibroblasts, tumor tissues, tumor - surrounding stromal tissues, TF, ESCC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 FGFR2 - positive fibroblasts, tumor tissues, tumor - surrounding stromal tissues, TF, ESCC