5-S-cysteinyldopa in the urine of melanoma patients.
A newly discovered amino acid, 5-S-cysteinyldopa, present in the urine of healthy subjects is excreted in pathological amounts in many patients suffering from melanoma metastases. Increased excretion of 5-S-cysteinyldopa may be observed before metastases become clinically evident. Determination of 5-S-cysteinyldopa is superior to determination of dopa+dopamine in the diagnosis of melanoma metastases.
D000328:Adult; D000368:Aged; D003548:Cysteinyldopa / Q000652:urine*; D004295:Dihydroxyphenylalanine / Q000031:analogs & derivatives*; D005134:Eye Neoplasms / Q000652:urine*; D005260:Female; D006801:Humans; D008297:Male; D008545:Melanoma / Q000652:urine*; D008875:Middle Aged; D009362:Neoplasm Metastasis; D012878:Skin Neoplasms / Q000652:urine*
D003548:Cysteinyldopa; D004295:Dihydroxyphenylalanine