CASE REPORTS
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Response of metastatic recurrent neuroblastoma to nitisinone: a modulator of tyrosine metabolism.

Nitisinone blocks the tyrosine pathway and may be effective in treating neuroblastoma. A 33-month-old male with heavily treated metastatic, recurrent, N-MYC amplified neuroblastoma received nitsinone (0.8 mg/kg/day escalated to 5.0 mg/kg/day). Dramatic tumor regression and resolution of pain without toxicity were observed. At 10 weeks, the tumor progressed. Nitisinone, low dose cyclophosphamide and doxorubicin subsequently produced a very good partial response. At 18 months the disease progressed. The child succumbed 21 months after starting nitisinone. Nitisinone produced an increase in tyrosine and catecholamine metabolite (HVA, VMA, and metanephrines) levels. Nitisinone may be a promising agent in metastatic neuroblastoma.

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