3,4-dihydroxyphenylalanine (DOPA) metabolism in screening-detected and non-screening-detected neuroblastoma.

Abstract:

:To investigate the possible clinical application of the hypothesis that insufficient induction of 3,4-dihydroxyphenylalanine decarboxylase (DDC) causes accumulation and secretion of 3,4-dihydroxyphenylalanine (DOPA) in unfavorable neuroblastomas, we measured plasma DOPA in 28 neuroblastoma patients. Abnormally high levels were demonstrated in patients with neuroblastoma, and the levels in patients with clinical manifestations (median, 44,800 pg/ml; range, 17,700 to 220,000 pg/ml; n = 6) were significantly higher than those in patients detected by screening (median, 5825 pg/ml; range 2890 to 33,300 pg/ml; n = 22) (P = 0.0004). The catecholamine secretion profiles of the two groups were different, and it was suggested that the relative deficiency of DDC caused DOPA secretion in patients in the former group, whose prognosis was unfavorable, except in one case. In both groups, serial determination of plasma DOPA was a good monitor of the disease course. The higher plasma DOPA level (>9400 pg/ml) was significantly correlated with the patients' age (>1 year old) (P = 0.019), tumor stage (III, IV) (P = 0.029), and DNA diploidy (P = 0.018). These results are consistent with previous studies that demonstrated plasma DOPA was a useful marker in the diagnosis and follow-up of neuroblastoma. The results also indicate that higher plasma DOPA levels are associated with the unfavorable characteristics of neuroblastoma, which seem to support the hypothesis on DDC deficiency in unfavorable neuroblastoma.

journal_name

Pediatr Hematol Oncol

authors

Ikeda H,Suzuki N,Takahashi A,Kuroiwa M,Matsuyama S

doi

10.3109/08880019609033369

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

21-32

issue

1

eissn

0888-0018

issn

1521-0669

journal_volume

13

pub_type

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