Brain metastases of malignant melanoma in interferon complete responders: clinical and radiological observations.

Three patients with metastatic malignant melanoma, 2 of whom were males with primary lesion on the shoulder, and a female with primary lesion on the ankle, with Clark's level III-IV, completely responded to interferon-DTIC, but failed in the brain. Radiologically, all the lesions were peripheral in location, and none showed any bleeding tendency. Clinically, these lesions seemed to be resistant to radiotherapy, chemotherapy or steroid treatment, and were the cause of death after a very short survival period. Interferon apparently is inactive against melanoma brain metastases, but does cause CNS symptoms. Because CNS metastases are sometimes the sole site of clinical relapse, and are frequently disabling, prophylactic cranial irradiation (PCI) needs to be studied in high risk patients.