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We hypothesized that signaling through multiple mitogen - activated protein kinase ( MAPK ) kinase ( MKK ) pathways is essential for the growth and vascularization of soft - tissue sarcomas , which are malignant tumors derived from mesenchymal tissues .
 soft - tissue sarcomas, malignant tumors, mesenchymal tissues
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 soft - tissue sarcomas, malignant tumors, mesenchymal tissues