Non-Hodgkin's lymphomas of head and neck extranodal sites.

The initial staging, therapy and course of 156 patients with non-Hodgkin's lymphomas of head and neck extranodal sites were analyzed to determine whether they have a natural history which differs from primary nodal disease. The sites involved were: Waldeyer's ring-103 patients (tonsil-60, nasopharynx-25, base of tongue-18), and extralymphatic sites-53 patients (salivary gland-20, paranasal sinus-20, oral cavity-10, and larynx-3). Seventy-six percent had unfavorable histologies and 24% had favorable histologies. Fifty-three percent had pathologic Stages I-II and 47% had Stages III-IV. The 5-year survival was influenced by primary sites: salivary gland-61%, oral cavity-57%, tonsil-49%, base of tongue-47%, nasopharynx-36% and paranasal sinus-12%. The 5-year survival was also influenced by histology: unfavorable histologies-39%, favorable histologies-69%. The Ann Arbor staging system was more useful than TNM for determining outcome. For patients with Stage I-II unfavorable histologies treated with radiation alone, the 5-year survival was: involved field-24%, extended field-42%, total lymphoid irradiation-52%. The majority of patients who failed did so in extranodal sites. Forty-one patients with advanced disease received a variety of chemotherapy regimens as the sole treatment. There was a high percentage of CNS recurrence with paranasal sinus lymphoma, and CNS prophylaxis may be necessary. For head and neck extranodal lymphomas, limited radiation is inadequate, and combined modality programs should be considered.