for 21 patients previously diagnosed as having melanoma but who were clinically free of disease ( stage i ) , the mean concentration of l-dopa in plasma , 1.01 ( sd 0.12 ) micrograms/l , was not significantly different from that of 32 normal controls , 1.23 ( sd 0.16 ) micrograms/l .
C0025202
melanoma
C0023570
l-dopa