Time filter

Source Type

Boztug H.,Medical University of Vienna | Zecca M.,Paediatric Haematology Oncology | Sykora K.-W.,Hannover Medical School | Veys P.,Great Ormond Street Hospital for Children National Health Service Trust | And 7 more authors.
Annals of Hematology

Standard myeloablative conditioning regimens for children with acute lymphoblastic leukaemia are based on total body irradiation (TBI). However, TBI causes profound short-term and long-term side effects, provoking the necessity for alternative regimens. Treosulfan combines a potent immunosuppressive and antileukaemic effect with myeloablative activity and low toxicity profile. We retrospectively studied toxicity and outcome of 71 paediatric patients with acute lymphoblastic leukaemia (ALL) undergoing haematopoietic stem cell transplantation (HSCT) following treosulfan-based conditioning aiming to identify risk factors for treatment failure and dose-depending outcome differences. Early regimen-related toxicity was low. No case of veno-occlusive disease was reported. There was no association of toxicity with age or number of HSCT. Event-free survival (EFS) of infants was significantly better compared to older children. Overall survival (OS) at 3 years was 51 % and not significantly influenced by number of HSCT (first HSCT 54 %, ≥second HSCT 44 %, p = 0.71). In multivariate analysis, OS and EFS were significantly worse for patients transplanted without complete remission (p = 0.04 and 0.004). Treatment-related mortality was low at 14 %. We conclude that treosulfan-based conditioning is a safe and efficacious approach for paediatric ALL. © 2014, Springer-Verlag Berlin Heidelberg. Source

Guasti L.,Queen Mary, University of London | Silvennoinen S.,Kuopio University Hospital | Bulstrode N.W.,Great Ormond Street Hospital for Children National Health Service Trust | Ferretti P.,University College London | And 2 more authors.
Journal of Clinical Endocrinology and Metabolism

Objective: The objective of the studywasto assess the role of FGF21 in growth regulation inhumans using postnatal growth failure of very preterm infants as a model.Design: FGF21 levels were measured serially in very preterm infants, and their linear growth evaluated from birth to term-equivalent age. Primary chondrocytes obtained from pediatric donors were used to test whether FGF21 can directly interfere with GH signaling.Context: The hormone fibroblast growth factor 21 (FGF21) is a key metabolic regulator in the adaptation to fasting. In food-restricted mice, inhibition of skeletal growth is mediated by the antagonistic effect of FGF21 on GH action in the liver and growth plate.Results: Anegative association (β-.415, P <.005, linear regression model) of FGF21 levels with the change in SD score for length was found. In primary chondrocytes, FGF21 upregulated basal and GH-induced SOCS2 expression and inhibited GH-induced signal transducer and activator of transcription 5 (STAT5) phosphorylation as well as GH-induced COLII and ALP expression. Finally, FGF21 inhibited GH-induced IGF-1 expression and cell proliferation, indicating GH resistance. However, FGF21 did not affect IGF-1-induced cell proliferation.Conclusions: Elevated FGF21 serum levels during the first weeks of life are independently associated with postnatal growth failure in preterm infants. Furthermore, our data provide mechanistic insights into GH resistance secondary to prematurity and may offer an explanation for the growth failure commonly seen in chronic conditions of childhood. Copyright © 2014 by the Endocrine Society. Source

Flett A.S.,University College London | Hayward M.P.,University College London | Ashworth M.T.,Great Ormond Street Hospital for Children National Health Service Trust | Hansen M.S.,University College London | And 4 more authors.

Background-: Diffuse myocardial fibrosis is a final end point in most cardiac diseases. It is missed by the cardiovascular magnetic resonance (CMR) late gadolinium enhancement technique. Currently, quantifying diffuse myocardial fibrosis requires invasive biopsy, with inherent risk and sampling error. We have developed a robust and noninvasive technique, equilibrium contrast CMR (EQ-CMR) to quantify diffuse fibrosis and have validated it against the current gold standard of surgical myocardial biopsy. Methods and results-: The 3 principles of EQ-CMR are a bolus of extracellular gadolinium contrast followed by continuous infusion to achieve equilibrium; a blood sample to measure blood volume of distribution (1-hematocrit); and CMR to measure pre-and postequilibrium T1 (with heart rate correction). The myocardial volume of distribution is calculated, reflecting diffuse myocardial fibrosis. Clinical validation occurred in patients undergoing aortic valve replacement for aortic stenosis or myectomy in hypertrophic cardiomyopathy (n=18 and n=8, respectively). Surgical biopsies were analyzed for picrosirius red fibrosis quantification on histology. The mean histological fibrosis was 20.5±11% in aortic stenosis and 17.1±7.4% in hypertrophic cardiomyopathy. EQ-CMR correlated strongly with biopsy histological fibrosis: aortic stenosis, r=0.86, Kendall Tau coefficient (T)=0.71, P<0.001; hypertrophic cardiomyopathy, r=0.62, T=0.52, P=0.08; combined r=0.80, T=0.67, P<0.001. Conclusions-: We have developed and validated a new technique, EQ-CMR, to measure diffuse myocardial fibrosis as an add-on to a standard CMR scan, which allows for the noninvasive quantification of the diffuse fibrosis burden in myocardial diseases. © 2010 American Heart Association, Inc. Source

Werner K.,Young Epilepsy | Werner K.,University College London | Fosi T.,Young Epilepsy | Fosi T.,University College London | And 8 more authors.
Annals of Neurology

Objective: This study investigates auditory processing in infants with West syndrome (WS) using event-related potentials (ERPs). Methods: ERPs were measured in 25 infants with mainly symptomatic WS (age range = 3-10 months) and 26 healthy term infants (age range = 3-9 months) using an auditory novelty oddball paradigm. The ERP recordings were made during wakefulness and repeated in stage II sleep. Results: The obligatory components (P150, N250, P350) and novelty response components (P300, Nc) were recordable during both sleep and wakefulness in patients and controls. All ERP latencies decreased with age in controls but not in the WS group (age x group interaction, F = 22.3, p < 0.0001). These ERP latency alterations were not affected by pharmacological treatment for WS. Interpretation: This study demonstrated a persistently altered ERP signature in patients with a recent history of infantile spasms. The prolongation of auditory obligatory and novelty ERPs in WS patients indicates a severe failure of temporal lobe maturation during infancy. It remains to be investigated whether this predicts long-term cognitive impairments characteristic for this epileptic encephalopathy. © 2014 The Authors Annals of Neurology published by Wiley Periodicals, Inc. Source

Barnett A.N.R.,Guys Hospital | Barnett A.N.R.,Kings College London | Hudson A.,Statistics and Clinical Audit | Hadjianastassiou V.G.,Guys Hospital | And 7 more authors.

BACKGROUND: Blood group-incompatible transplantation is one strategy used when a potential recipient does not have a compatible living donor. Current practice includes desensitization strategies to reduce antibody titers. However, when antibodies are low, in cardiac transplantation in neonates for example, no desensitization is required. This study is the first to examine the distribution of ABO blood group antibody titers in a population of pediatric patients on the deceased-donor renal transplantation waiting list. METHODS: All patients from two pediatric nephrology centers active on the national deceased-donor waiting list had antibody titers (total immunoglobulin load) measured. A simulation modeling the effect of allocating blood group-incompatible deceased-donor kidneys to those patients with titers of 16 or lower was developed. RESULTS: Twenty-four children were screened; eight (33.3%) had titers of either anti-A or anti-B antibodies of 8 or lower. A further three (12.5%) had either an anti-A or anti-B antibody titer of 16. Blood group A or B patients had lower antibody levels than blood group O patients. In blood group O patients, levels of anti-A antibodies were higher than anti-B antibodies (Wilcoxon signed rank test, P=0.028). The simulation model showed that a change in organ allocation policy would increase pediatric transplant activity by 2.2% and reduce the median waiting time for a transplant. CONCLUSION: This allocation strategy may be of particular benefit to those pediatric patients who have been on the deceased-donor waiting list for a long time or those with a high calculated reaction frequency. Copyright © 2012 by Lippincott Williams &Wilkins. Source

Discover hidden collaborations