Stage I includes: T1, N0, M0. T1: Supraglottis: Tumor is limited to one subsite of supraglottis with normal vocal cord mobility. Glottis: Tumor is limited to the vocal cord(s) (may involve anterior or posterior commissure) with normal mobility. Subglottis: Tumor is limited to the subglottis. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 8th ed.) [from NCI]