The prognostic significance of lymph node involvement in pyriform sinus and supraglottic cancers.

Three hundred and thirty-three patients with carcinoma of the pyriform sinus or supraglottis were reviewed with regard to lymph node involvement and prognosis. All patients were treated with curative intent and had a minimum follow-up of 3 years. Every patient was restaged according to the AJCC, 1983 recommendations. In addition, nodal fixation to cervical fascia or muscle was evaluated with regard to prognosis. Seventy-five percent (89/119) of the pyriform sinus cancer and 47% (101/214) of the supraglottic cancer patients presented with clinically palpable cervical nodes. The distribution of patients according to N stage was 143 (43%), 84 (25%), 58 (17%), 48 (14%) for N0, N1, N2, N3 respectively. In patients where information on nodal fixation was available, 29% had fixed nodes. No difference in prognosis was noted between N0 and N1 or N2 and N3 stages, and these groups were therefore combined. The 3-year survival was 85% for T1 (N0/N1), 77% for T2 (N0/N1), 63% for T3 (N0/N1), and 65% for T4 (N0/N1) cases compared to 19% for T1 (N2/N3), 34% for T2 (N2/N3), 33% for T3 (N2/N3), and 32% for T4 (N2/N3) cases demonstrating that N stage predominates over T stage with respect to survival. Both the local recurrences and distant metastases increased as N stage advanced. A noteworthy difference between patients with fixed nodes and mobile nodes was found with regard to neck recurrence (35% versus 17%), distant metastases (33% versus 19%) and survival (27% versus 58%). In conclusion, nodal stage is a highly significant determinant of survival independent of T stage in cancers of the pyriform sinus and supraglottis. N0, N1 status and mobility were predictive of a favorable prognosis as opposed to N2, N3 status and fixation. These findings were consistent when the pyriform sinus cancers and supraglottic cancers were analyzed separately.