3233
Formation of these plugs was probably due to extensive tumor necrosis at the level of the walls of the major uterine veins , which resulted in an open exchange of tumor plugs to the vascular spaces ; decrease in tumor tissue coherence secondary to chemotherapy may have further contributed to the formation of tumor emboli .
 tumor, necrosis, tumor, tumor, tumor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 tumor, necrosis, tumor, tumor, tumor