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In conclusion , the metastasis from TRP - 1 / Tag RPE tumors towards spleen and lymph nodes serves as potential tool to investigate biology and metastasis of tumors derived from the pigment epithelium .
 TRP - 1 / Tag RPE tumors, spleen, lymph nodes, tumors, pigment epithelium
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 TRP - 1 / Tag RPE tumors, spleen, lymph nodes, tumors, pigment epithelium