Seventeen patients with a local recurrence or intransit metastases of a malignant melanoma of the arm or leg were treated by normothermic regional perfusion with phenylalanine mustard. Seven of these patients had regional lymph node metastases as well. The follow-up period was with five to eight years or until the time of death. Two years after treatment, eleven of the seventeen patients were still alive. After a five year follow-up, six patients were still alive without demonstrable recurrence or metastases. Only three patients had a recurrence in an extremity; two of these three patients simultaneously showed general metastization.