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tumor invades mucosa of more than one adjacent subsite of supraglottis or glottis or region outside the supraglottis (like the base of the tongue) without fixation of the larynx
tumor limited to larynx with vocal cord fixation and/or invades any of the following: postcricoid area, pre-epiglottic tissues
tumor invades through the thyroid cartilage, and/or invades tissues beyond the larynx (like the thyroid, esophagus)
tumor extends to supraglottis and/or subglottis from the glottis with impaired vocal cord mobility
tumor invades through the thyroid cartilage and/or invades tissues beyond the larynx (like the trachea)
tumor invades through cricoid or thyroid cartilage and/or invades tissues beyond the larynx (like the trachea)
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