A computer-aided analysis of 5,109 patients with malignant melanoma was performed. Patient population characteristics according to body site (head and neck, extremity, and trunk) were determined for the following parameters: sex, histologic type of melanoma, Clark's level, Breslow thickness, age, clinical status of regional nodes, presence or absence of ulceration, and recurrence. Head and neck melanomas accounted for 17% of the total population (N = 877). A detailed analysis of general population characteristics according to subsites within the head and neck region (ear, face, neck, nose, and scalp) was performed. Survival characteristics were determined for head and neck patients according to lymph node surgery, histologic type of tumor, and tumor thickness. The effect on survival of lymph node dissection (elective for stage I disease and therapeutic for stage II disease) was analyzed by univariate and multivariate methods. Elective lymph node dissection (ELND) was performed on 77 patients and 39 patients underwent therapeutic nodal dissection (TLND). Overall, survival was significantly improved following ELND as compared to TLND; however, multivariate analysis indicated the improved survival was related to variations of age within the population rather than the beneficial effect of lymph node surgery. Elective lymph node dissection did significantly reduce the incidence of recurrence for head and neck patients (p = 0.002). Since recurrence was demonstrated to be directly related to survival, the trend toward improved survival following ELND after 5 years was felt to be important. There was no difference in survival according to the histologic type of melanoma.
While mucosal-based melanomas of the head and neck region are uncommon lesions, when they do arise they usually follow an inexorably aggressive course. Experience with these tumors is, necessarily, limited; as such, well-worked out treatment protocols for the treatment of such lesions are in short supply. It appears as though mucosal melanomas (MuMs) develop more frequently in the nasal cavity and paranasal sinus region, and less often in the oral cavity. It seems that the incidence of nodal metastasis is significantly lower for sinonasal MuMs than it is for MuMs of the oral cavity; this observation may influence decisions about performing neck dissection as a function of location of the primary MuM. At present, surgical excision remains the mainstay of treatment; however, anatomical complexities within the region can hamper attempts at complete excision. Radiotherapy has not traditionally been relied on for routine treatment of MuM, although some recent reports have challenged this view. Chemotherapy is, at present, employed principally in the treatment of disseminated disease and for palliation. As a diagnostic matter, MuM belongs to the class of tumors that, on light microscopy, may with some regularity be confused with other malignancies (including sarcomas, plasmacytomas, and carcinomas); as a consequence, this is a diagnosis which is often best confirmed by way of ancillary testing via immunohistochemical studies. A better grasp of the best means of treating MuM will likely come only when large referral centers are able to pool their experiences with these uncommon yet virulent malignancies.
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