Radiotherapy in N0 head and neck cancer patients.

The efficacy of elective radiotherapy in N0 cancer of the oropharynx, hypopharynx and supraglottic larynx was assessed retrospectively in a large series of head and neck cancer patients treated at the Institut Curie between 1958 and 1976. Despite a significant incidence of false-negative cases accompanied by extra-capsular tumor spread, radiation tissue doses of 4500-5500 cGy were highly successful in preventing nodal disease in clinically negative necks. Isolated node failure occurred in only 2% of 611 cases of oropharyngeal and pharyngolaryngeal cancer from a total group of 1646 patients and 2% of 237 N0 cases of supraglottic vestibular cancer taken from a series of 340 patients. The impact of neck status on survival and disease-free survival is discussed. Present findings show that elective irradiation of the neck is easily integrated into the radiation management of primary pharyngeal and supraglottic laryngeal cancers and results in no additional morbidity to patients so treated.