Inherited metabolic diseases account for about one third of pediatric patients with hepatomegaly, acute liver failure, cirrhosis or cholestasis. Specifically for pediatric acute liver failure, they ...account for 10–15% of cases, with a mortality of 22–65%. The percentage of acute liver failure caused by an inherited metabolic disease in children <2–3 years of age is even higher, ranging from a third to half of all cases. Metabolic liver disease accounts for 8–13% of all pediatric liver transplantations. Despite this high burden of disease, underdiagnosis remains common. We reviewed and updated the list of known metabolic etiologies associated with various types of metabolic liver involvement, and found 142 relevant inborn errors of metabolism. This represents the second of a series of articles attempting to create and maintain a comprehensive list of clinical and metabolic differential diagnoses according to system involvement.
•We found 142 IEMs associated with various types of liver involvement, and provide a list of tests to aid in their diagnosis.•This is the second issue in a series of educational summaries providing a comprehensive list of metabolic differential diagnosis.•This list will be curated and updated on a continual basis in the IEMbase website.
Congenital disorders of glycosylation (CDG) are a group of more than 130 inborn errors of metabolism affecting
-linked,
-linked protein and lipid-linked glycosylation. The phenotype in CDG patients ...includes frequent liver involvement, especially the disorders belonging to the
-linked protein glycosylation group. There are only a few treatable CDG. Mannose-Phosphate Isomerase (MPI)-CDG was the first treatable CDG by high dose mannose supplements. Recently, with the successful use of d-galactose in Phosphoglucomutase 1 (PGM1)-CDG, other CDG types have been trialed on galactose and with an increasing number of potential nutritional therapies. Current mini review focuses on therapies in glycosylation disorders affecting liver function and dietary intervention in general in
-linked glycosylation disorders. We also emphasize now the importance of early screening for CDG in patients with mild hepatopathy but also in cholestasis.
Background and study aim
Indeterminate biliary strictures and difficult bile duct stones remain clinically arduous and challenging situations. We aimed to evaluate the utility of the single-operator ...cholangioscopy (SOC)-system SpyGlass in both conditions in a single-center biliopancreatic interventional unit and in perspective of available aggregated literature.
Methods
Usefulness of SOC was assessed for the above-mentioned indications by means of the combination of successful procedural completion, clinical success and incidence of procedure-related adverse events in our own prospective cohort from 3/2010 to 7/2014 and all available literature till 6/2015.
Results
Our single-center cohort constituted of 84 patients undergoing SpyGlass either for indeterminate strictures (
n
= 45) or difficult stones (
n
= 39). In addition, a comprehensive literature review yielded 851 patients (from 15 series) for either stenosis (
n
= 646, 75.9 %) and difficult stones (
n
= 205, 24.1 %). In our series, overall procedural success amounted to 85.7 % (with 88.9 % for stenosis or 82.1 % for stones) compared to 90.7, 91.5 and 88.3 % in overall literature, respectively. Sensitivity, specificity and accuracy for
visual diagnosis
in our cohort added up to 83.3, 82.9 and 82.9 % compared to 90.8, 90.9 and 90.8 % in the pooled analysis. Respective figures for
SOC
-
directed biopsies
totaled 85.7, 100 and 95.7 % in our cohort and 72.4, 100 and 84 % overall. Overall procedure-related complications varied between 9.4 and 21.4 %.
Conclusions
The SOC-platform SpyGlass can be considered useful in the context of indeterminate biliary strictures and difficult-to-remove biliary stones. In both, SpyGlass-assisted intervention is associated with high procedural success and alters clinical outcome compared to conventional approaches with an acceptable safety profile.
There are numerous inborn errors of metabolism of the liver, and they are all rare to very rare. To get a clear picture of the indications for gene transfer in these conditions, it is essential to ...get a clear view on the current (lack of) insight in the pathophysiology of these disorders, the current treatment options and hence on the window of opportunity for new treatments as gene transfer. The aim of this review, is to illustrate the problems related to treatment of inborn errors of metabolism of the liver. General aspects defining the quest for treatments for very rare diseases are touched upon, but for the sake of clarity, this review is restricted to five illustrative examples: Crigler-Najjar type I, the urea cycle defects, phenylketonuria, classic galactosemia and propionic acidemia. These examples reflect the problems that are currently experienced and can be expected, when gene transfer trials for these disorders are undertaken.
Predicting drug-induced liver injury in a preclinical setting remains challenging, as cultured primary human hepatocytes (PHHs), pluripotent stem cell-derived hepatocyte-like cells (HLCs), and ...hepatoma cells exhibit poor drug biotransformation capacity. We here demonstrate that hepatic functionality depends more on cellular metabolism and extracellular nutrients than on developmental regulators. Specifically, we demonstrate that increasing extracellular amino acids beyond the nutritional need of HLCs and HepG2 cells induces glucose independence, mitochondrial function, and the acquisition of a transcriptional profile that is closer to PHHs. Moreover, we show that these high levels of amino acids are sufficient to drive HLC and HepG2 drug biotransformation and liver-toxin sensitivity to levels similar to those in PHHs. In conclusion, we provide data indicating that extracellular nutrient levels represent a major determinant of cellular maturity and can be utilized to guide stem cell differentiation to the hepatic lineage.
Phlebotomy constitutes the established treatment for HFE-related hemochromatosis. Retrospective studies have suggested proton pump inhibitors (PPIs) reduce the need for phlebotomy in this population. ...We conducted a randomized controlled trial to prove this. Thirty p.C282Y homozygous patients were randomly allocated to PPI (pantoprazole 40 mg/day) or placebo for 12 months. Phlebotomies were performed when serum ferritin was > 100 μg/L. Phlebotomy need turned out to be significantly lower in patients taking PPI (P = .0052). PPI treatment significantly reduces the need for phlebotomies in p.C282Y homozygous patients. In view of the known long-term safety profile of PPI, they can be a valuable addition to standard therapy. Clinicaltrials.gov: NCT01524757.
Off-label use of (orphan) medicinal products for (rare) diseases is quite common but not underpinned by clinical studies to confirm efficacy and safety. No risk-analyses by regulatory agencies are ...carried out. The objective of this study was to map off-label use of orphan medicinal products in Belgium in terms of attitude towards off-label prescribing, factors influencing off-label prescribing, disclosure of information towards the patient, reporting of off-label use, risks and consequences. Most of the EMA authorized orphan drugs are fully reimbursed in Belgium under well-defined circumstances. Moreover, a "Special Solidarity Fund" takes care of some specific cases eventually prescribed off-label.
Semi-structured interviews with seven physicians with expertise in the treatment with and six experts in the reimbursement of orphan medicinal products in Belgium. This task was performed by five last-year pharmacy students after having studied profoundly the medical literature around off-label prescribing. They had no previous contact with the participants.
Most participants do agree with the off-label use if the medicinal product is quite safe and well-tolerated, if the on-label indication is rather general and when all other options have failed in some specific, evidence-based indications, especially in children. Before starting off-label use, the patient/family needs to be fully and clearly informed. The treatment is not reimbursed but sometimes sponsored by the company or by charity funds. Reporting of the outcome is necessary to avoid losing valuable information. The prescriber is responsible and can be held accountable.
While there is support from physicians and reimbursement experts, there is also concern in case of off-label use, mainly for reasons of patient safety especially when medicinal products are prescribed off-label in the absence of medical or scientific justification and driven by cost-containment motives.
Metabolic rewiring is a hallmark of cancer that supports tumor growth, survival, and chemotherapy resistance. Although normal cells often rely on extracellular serine and glycine supply, a ...significant subset of cancers becomes addicted to intracellular serine/glycine synthesis, offering an attractive drug target. Previously developed inhibitors of serine/glycine synthesis enzymes did not reach clinical trials due to unfavorable pharmacokinetic profiles, implying that further efforts to identify clinically applicable drugs targeting this pathway are required. In this study, we aimed to develop therapies that can rapidly enter the clinical practice by focusing on drug repurposing, as their safety and cost-effectiveness have been optimized before. Using a yeast model system, we repurposed two compounds, sertraline and thimerosal, for their selective toxicity against serine/glycine synthesis-addicted breast cancer and T-cell acute lymphoblastic leukemia cell lines. Isotope tracer metabolomics, computational docking, enzymatic assays, and drug-target interaction studies revealed that sertraline and thimerosal inhibit serine/glycine synthesis enzymes serine hydroxymethyltransferase and phosphoglycerate dehydrogenase, respectively. In addition, we demonstrated that sertraline's antiproliferative activity was further aggravated by mitochondrial inhibitors, such as the antimalarial artemether, by causing G
-S cell-cycle arrest. Most notably, this combination also resulted in serine-selective antitumor activity in breast cancer mouse xenografts. Collectively, this study provides molecular insights into the repurposed mode-of-action of the antidepressant sertraline and allows to delineate a hitherto unidentified group of cancers being particularly sensitive to treatment with sertraline. Furthermore, we highlight the simultaneous inhibition of serine/glycine synthesis and mitochondrial metabolism as a novel treatment strategy for serine/glycine synthesis-addicted cancers.
Acute hepatic porphyria (AHP) is a rare, debilitating disease characterized by potentially life-threatening attacks often resulting in chronic symptoms that negatively impact daily functioning and ...quality of life. Symptoms of AHP prevent many individuals from working and achieving lifetime work averages. The aim of this study was to apply a public economic framework to evaluate AHP in Belgium, taking into consideration a broad range of costs that are relevant to government in relation to social benefit payments and lifetime taxes paid.
A public economic framework was developed exploring lifetime costs for government attributed to an individual with AHP and recurrent attacks in Belgium. Work-activity and lifetime direct taxes paid, indirect consumption taxes and requirements for public benefits were estimated based on established clinical pathways for AHP and compared to the general population (GP). The model includes AHP-related healthcare costs and non-AHP healthcare costs for the GP.
Lifetime earnings are reduced in an individual with AHP by €347,802 per person (p.p.), translating to reduced lifetime taxes paid of €183,187 for an AHP individual compared to the GP. We estimate increased lifetime disability benefit support of €247,242 for an AHP individual compared to GP. Lifetime healthcare costs for a person with AHP were estimated to be €3,030,316 due to frequent hospitalisations associated with porphyria attacks compared to the GP. The lifetime costs for a person with 12 attacks per annum factoring in transfers, taxes and healthcare costs are estimated to be €3,460,745 p.p. Eliminating AHP attacks after 10 years of active disease, thus, enabling a person to return to work increases lifetime earnings by €224,575 p.p. Increased work activity in such individuals would generate an estimated €118,284 p.p. over their lifetime. The elimination of AHP attacks could also lead to reductions in disability payments of €179,184 p.p. and healthcare cost savings of €1,511,027 p.p.
Due to severe disability resulting from constant attacks, AHP patients with recurrent attacks incur significant public costs. Lifetime taxes paid are reduced as these attacks occur during peak earning and working years. In those patients, reducing AHP attacks can confer significant fiscal benefits for government, including reduced healthcare costs, reduced disability payments and improved tax revenue.
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