Stage III includes: (T3, N0, M0); (T1, N1, M0); (T2, N1, M0); (T3, N1, M0). T1: Supraglottis: Tumor limited to one subsite of supraglottis with normal vocal cord mobility. Glottis: Tumor limited to the vocal cord(s) (may involve anterior or posterior commissure) with normal mobility. Subglottis: Tumor limited to the subglottis. T2: Supraglottis: Tumor invades mucosa of more than one adjacent subsite of supraglottis or glottis or region outside the supraglottis (e.g., mucosa of base of tongue, vallecula, medial wall of pyriform sinus) without fixation of the larynx. Glottis: Tumor extends to supraglottis and/or subglottis, and/or with impaired vocal cord mobility. Subglottis: Tumor extends to vocal cord(s) with normal or impaired mobility. T3: Supraglottis: Tumor limited to larynx with vocal cord fixation and/or invades any of the following: postcricoid area, pre-epiglottic tissues, paraglottic space, and/or inner cortex of thyroid cartilage. Glottis: Tumor limited to the larynx with vocal cord fixation and/or invasion of paraglottic space, and/or inner cortex of the thyroid cartilage. Subglottis: Tumor limited to larynx with vocal cord fixation. N0: No regional lymph node metastasis. N1: Metastasis in a single ipsilateral lymph node, 3cm or less in greatest dimension. M0: No distant metastasis. (AJCC 6th and 7th eds.) [from NCI]