All of the following constitute supraglottic cancer except:
Vallecula
Lower border of cricoid
Posterior commisure
All
The lingual surface of the epiglottis and valleculae are in the oropharynx. The glottis comprises the vocal cords and the anterior and posterior cornmissures. Subglottis is a small area extending from the lower border of the cricoids to the under surface of the vocal cords