After 3 months, a right inguinal lymph node dissection revealed involvement in 1 of 6 lymph nodes. Clinical examination and computed tomography imaging showed no evidence of distant metastasis. The patient was considered to have T2bN1aM0 stage iiib disease.One month later, the patient started a 4-week induction course of adjuvant high-dose interferon alfa at a daily dose of 36×10 6 U intravenously 5 days per week, followed by an 11-month course of 18×10 6 U interferon alfa 3 times weekly subcutaneously for maintenance. He tolerated this regimen well, with some symptoms of muscle pain, diarrhea, fever, and occasional headaches in addition to a slight elevation of liver enzymes.Eleven months into therapy, the patient developed multiple (approximately 15) in-transit metastases in the upper right thigh. These erythematous lesions ranged in size from 1 mm to 10 mm. Two other similar subcutaneous nodules were also seen on the upper lateral aspect of the right thigh (Figure 1). The patient underwent palliative radiotherapy of 40 Gy in 10 fractions to each nodule and 30 Gy in 10 fractions to the intervening skin, with good response. Followup imaging showed no other recurrence. The patient completed his 1-year course of interferon.Six months after the course of interferon, the patient developed a tender 5-mm nodule above the left nipple, a 5-mm axillary nodule, and a small nodule under the chin and on the central back. The chest lesion was excised and proved to be melanoma. A punch biopsy of the left axillary nodule revealed a malignant non-melanin tumour. Immunohistochemistry for melanoma was positive for S100, mart-1, and tyrosinase, and negative for HMB45, suggesting metastatic disease 1 . Immunohistochemistry of the primary lesion was not available. In addition, imaging showed new right-middle-lobe lung nodules measuring up to 3.5 mm in diameter, and an enlarged 15×13-mm right external iliac lymph node. Investigations were initiated for enrollment in a trial for what was now stage iv disease.
ABSTRACTSpontaneous regression of metastatic melanoma is an exceedingly rare event, with only 76 well-documented cases in the literature since 1866. Here, we present the case of a patient who developed metastatic melanoma despite interferon therapy and who then achieved spontaneous regression shortly after a reaction to tetanus-diphtheria-pertussis vaccination. A common theme among these cases is the development of febrile illness before remission of the malignant disease. A brief overview of proposed mechanisms for these miraculous recoveries is presented, including a highlight on the potential role of the herv-k-mel viral marker, a nona-or decapeptide that appears in most melanomas, with homologies to peptides in pathogenic microorganisms.