Abstract
The mechanism of increased thrombin production has been investigated in children with high-risk neuroblastoma (NB), to detect any possible association between catheter- related venous thrombosis (VT) and prothrombotic factors. Consecutive children with high-risk NB were studied by color-doppler ultrasonography of the upper vein system and thrombophilia factors assessment. Plasma levels of Tissue Factor (TF), Vascular Endothelial Growth Factor (VEGF), Prothrombin Activation Fragment 1+2, and Thrombin-Antithrombin Complex were evaluated. Moreover, inherited thrombophilia factors (homocystein, antithrombin, protein C, protein S, factor V Leiden, activated protein C resistence, mutation H1299R and G1691A of factor V, mutation G20210A of prothrombin, mutation T677 and A1298C of methylenetetrahydrofolate reductase, and allele 4G of plasminogen activator inhibitor-1) were tested to exclude congenital disorders. Six patients with mean age: 48.8 months---were studied. Five patients were affected by stage 4 NB and another one by stage 3 NB with Myc-N amplification. All children had a central venous line (mean duration: 8.5 mos). Four patients (67%) had asymptomatic catheter-related VT visualized by color-doppler ultrasonography. No patie...Continue Reading
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