CASE REPORTS
JOURNAL ARTICLE
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One liver for four children: first clinical series of liver cell transplantation for severe neonatal urea cycle defects.

Transplantation 2009 March 16
BACKGROUND: Urea cycle disorders (UCD) have a poor prognosis despite dietary and pharmacologic therapy, especially if the onset of the disease is within the neonatal period. They are promising target diseases for liver cell transplantation (LCT), which may be a less invasive alternative or supplementation to orthotopic liver transplantation.

METHODS: Cryopreserved hepatocytes were isolated under good manufacturing practice conditions. Four children with severe neonatal UCD (age 1 day-3 years) received multiple intraportal infusions of cryopreserved hepatocytes from that same donor, a 9-day old neonate. Portal vein access was achieved surgically in two children, whereas the umbilical vein was suitable for interventional catheter placement in two neonates. Cell applications were carefully monitored by means of Doppler ultrasound and portal vein pressure.

RESULTS: LCT was feasible in all children. No signs of portal vein thrombosis or extrahepatic shunting were observed. All children showed metabolic stabilization during observation periods of 4 to 13 months. One child with prenatally diagnosed ornithine transcarbamylase deficiency died after 4 months from a fatal metabolic decompensation.

CONCLUSIONS: Given the poor prognosis of UCD with conservative therapy, LCT caused considerable beneficial effects. Periods of hyperammonemia and clinically relevant crises could be reduced during an observation period of up to 13 months. Though cell therapy is not a permanent therapeutic option, bridging to liver transplantation may be substantially improved.

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