4099
Primary tumor sites were oropharynx , 10 patients ; hypopharynx , four ; larynx , two ; oral cavity , three ; unknown primary , two ; and nasal cavity and parotid gland , one each .
 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