Role of RT-PCR tyrosinase detection in the monitoring of patients with advanced metastatic melanoma

In recent studies a new method has been proposed to detect circulating mela noma cells in the peripheral blood of patients, based on the amplification of the mRNA for tyrosinase, an enzyme involved in melanin biosynthesis that is expressed only by melanocytic cells. The sensitivity and clinical relev ance of this method are still controversial. In the present study, 596 bloo d samples from 186 melanoma patients at various clinical tumour stages, tog ether with samples from 25 healthy volunteers, were analysed with the aim o f investigating the value of tyrosinase detection in predicting melanoma re currence. We suggest a possible role for this marker in the monitoring of m elanoma patients after the excision of regional lymph node metastases, and provide evidence that tyrosinase is related to the status of disease in adv anced metastatic patients. Moreover, chemotherapy administration appeared t o influence tyrosinase determination and may explain the discrepancies in t he reported percentages of positive samples. (C) 2000 Lippincott Williams & Wilkins.