Isolated perfusion of extremities for metastatic melanoma from an unknown primary lesion.

Since 1957, 822 patients with invasive malignant melanoma of the limbs were treated by regional perfusion at the Tulane Medical Center. Between 1958 and 1982, there were 32 patients with regional metastatic melanoma from an unknown primary site involving either the upper limb and axillary lymph nodes or lower limb and femoral or inguinal lymph nodes. This group represents 3.5% of patients with regional melanomas treated during this period. There were 16 patients with upper limb regional metastases and 14 patients with lower limb metastases. Sixteen patients had stage IIIB disease (ie, regional lymph node metastases), ten had stage IIIA disease (ie, satellitosis), and four had stage IIIAB disease. Six patients had a history of a suggestive limb lesion that had completely regressed and showed no residual tumor on biopsy. All 30 patients were treated by regional isolated perfusion and regional lymph node dissection, with surgical excision of in-transit disease when possible. The cumulative five-year survival for all patients is 50%. Interestingly, the patients with a history of a lesion that regressed had 85% cumulative five-year survival, and the patients with stage IIIB disease did almost as well, with 62% surviving for five years.