Late metastases of cutaneous melanoma: an analysis of 31 patients.

Analysis of data of 6298 patients with cutaneous melanoma seen at the Department of Dermatology and Allergology at the Ludwig-Maximilians University of Munich between 1977 and 1998 identified 31 patients who first experienced metastatic disease 10 or more years after surgical treatment of the primary melanoma. The mean tumor thickness in patients with late progression of disease was 1.4 mm. There was no sex predominance. Of 31 patients, 15 (48. 3%) were female and included both premenopausal and postmenopausal women at the time of initial diagnosis without any predominance. Sixteen of the 31 patients (51.6%) with late onset of progression had primary tumors located on the trunk. The prognosis after relapse was related to the site of recurrence; survival after local or regional node recurrence was often prolonged, whereas survival after distant metastases usually was limited. Survival after late recurrence did not correlate with disease-free survival. A high-risk group for late recurrence could not be identified. The data emphasize the value of continued clinical follow-up and self-examination for early detection of regional recurrences. We advocate a lifelong follow-up, also to identify other melanocytic lesions at risk (eg, dysplastic nevi, secondary or multiple melanomas).