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5-S-Cysteinyldopa (5SCD), the precursor of pheomelanine, has been reported to be a reliable marker for occult melanoma metastases. The goal of this study was to investigate whether serum 5SCD is also a marker to follow the efficacy of treatment of melanoma patients.Serum samples were collected before and after each cycle of immuno- or immuno-chemotherapy from 1991 until 1995 from 11 patients suffering...