- Patients at initial presentation of melanoma must undergo an adequate wide excision of the primary lesion, if present; patients with previously diagnosed melanoma must have had all current disease resected with pathologically negative margins and must have no evidence of disease at the primary site or must undergo re-resection of the primary site; a full lymphadenectomy meeting the criteria outlined is required for all node-positive patients including those with positive sentinel nodes; patients with recurrent disease who have had a prior complete lymphadenectomy fulfill this requirement as long as all recurrent disease has been resected; for all patients, all disease must have been resected with negative pathological margins and no clinical, radiologic, or pathological evidence of any incompletely resected melanoma; patients must be registered within 98 days of the last surgery performed to render the patient free of disease; patients must be registered within 98 days of the last surgery performed to render the patient free of disease