Publications by authors named "Jaap Groothoff"

Background: The combination of high prices and uncertain effectiveness is a growing challenge in the field of orphan medicines, hampering health technology assessments. Hence, new methods for establishing price benchmarks might be necessary to support reimbursement negotiations. In this study, we applied several pricing models containing cost-based elements to the case of lumasiran for treating primary hyperoxaluria type 1.

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Article Synopsis
  • - Glyoxylate, a toxic byproduct of metabolism, is rapidly converted into oxalate, necessitating effective detoxification systems in various cell compartments, with key enzymes AGT and GRHPR involved in this process.
  • - Mutations in genes encoding AGT and GRHPR lead to primary hyperoxaluria types 1 and 2, respectively, while a defect in the HOGA1 enzyme is associated with type 3, all resulting in serious kidney issues such as nephrocalcinosis and potential kidney failure.
  • - Recent advancements in therapies, particularly RNAi-based treatments (lumasiran and nedosiran), are improving outcomes for primary hyperoxaluria, with nedosiran targeting all
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Hyperoxaluria is a condition in which there is a pathologic abundance of oxalate in the urine through either hepatic overproduction (primary hyperoxaluria [PH]) or excessive enteric absorption of dietary oxalate (enteric hyperoxaluria [EH]). Severity can vary with the most severe forms causing kidney failure and extrarenal manifestations. To address the current challenges and innovations in hyperoxaluria, the 14th International Hyperoxaluria Workshop convened in Perugia, Italy, bringing together international experts for focused presentation and discussion.

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Introduction: Primary hyperoxaluria type 1 (PH1) is known for its variable clinical course, even within families. However, the extent of this heterogeneity has not been well-studied. We aimed to analyze intrafamilial clinical heterogeneity and disease course among siblings in a large cohort of familial PH1 cases.

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Background And Hypothesis: Young adults starting kidney replacement therapy (KRT) during childhood and reaching their 18th birthday (i.e. adult survivors of childhood KRT) form a challenging population of interest to nephrologists treating adults, as during this period there will be a transition to adult renal centres.

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Rationale & Objective: Growth failure is a common problem among children with chronic kidney disease (CKD). Reduced height is associated with psychosocial burden, social stigma, and impaired quality of life. This study describes the aspects of growth impairment that are most impactful from the perspectives of children with CKD, their parents, and health professionals.

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Introduction: Patients with primary hyperoxaluria type 1 (PH1), a genetic disorder associated with hepatic oxalate overproduction, frequently experience recurrent kidney stones and worsening kidney function. Lumasiran is indicated for the treatment of PH1 to lower urinary and plasma oxalate (POx).

Methods: ILLUMINATE-A (NCT03681184) is a phase III trial in patients aged ≥6 years with PH1 and estimated glomerular filtration rate (eGFR) ≥30 ml/min per 1.

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Background: Homozygous familial hypercholesterolaemia (HoFH) is a rare genetic disease characterised by extremely high plasma LDL cholesterol from birth, causing atherosclerotic cardiovascular disease at a young age. Lipoprotein apheresis in combination with lipid-lowering drugs effectively reduce LDL cholesterol, but long-term health outcomes of such treatment are unknown. We aimed to investigate the long-term cardiovascular outcomes associated with lipoprotein apheresis initiated in childhood or adolescence.

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Article Synopsis
  • Primary hyperoxaluria (PH) is a rare genetic disorder affecting glyoxylate metabolism, and nedosiran is an FDA-approved RNAi therapeutic for treating PH1, evaluated in the PHYOX3 trial.
  • The trial analyzed the safety and efficacy of monthly nedosiran over 30 months in participants from a previous trial, with a focus on those with stable kidney function and no prior major interventions.
  • Results showed significant reductions in urinary oxalate levels and overall well-tolerance of the treatment, with most participants experiencing only mild to moderate adverse effects, and the study is still ongoing.
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Article Synopsis
  • Homozygous familial hypercholesterolaemia is a serious genetic disease that makes cholesterol levels super high, which can lead to heart problems very early in life.
  • It's really important to start treating it right away, but many kids still can't reach their cholesterol goals even with medicine and diet.
  • Lipoprotein apheresis is a special treatment that can reduce bad cholesterol by over 70%, and experts from around the world have created guidelines on how to use it for kids with this condition.
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Glyoxylate is a key metabolite generated from various precursor substrates in different subcellular compartments including mitochondria, peroxisomes, and the cytosol. The fact that glyoxylate is a good substrate for the ubiquitously expressed enzyme lactate dehydrogenase (LDH) requires the presence of efficient glyoxylate detoxification systems to avoid the formation of oxalate. Furthermore, this detoxification needs to be compartment-specific since LDH is actively present in multiple subcellular compartments including peroxisomes, mitochondria, and the cytosol.

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Homozygous familial hypercholesterolaemia is a life-threatening genetic condition, which causes extremely elevated LDL-C levels and atherosclerotic cardiovascular disease very early in life. It is vital to start effective lipid-lowering treatment from diagnosis onwards. Even with dietary and current multimodal pharmaceutical lipid-lowering therapies, LDL-C treatment goals cannot be achieved in many children.

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Background: The prevalence of obesity-related co-morbidities is rising parallel to the childhood obesity epidemic. High blood pressure (BP), as one of these co-morbidities, is detected nowadays at increasingly younger ages. The diagnosis of elevated BP and hypertension, especially in the childhood population, presents a challenge to clinicians.

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  • Nedosiran is an RNA interference agent designed to lower oxalate production in patients with primary hyperoxaluria subtype 3 (PH3) by targeting a specific liver enzyme.
  • In a phase I clinical trial, researchers tested the safety and effectiveness of a single dose of nedosiran compared to a placebo in six participants, finding it well-tolerated with no major safety issues.
  • Although the primary measure of effectiveness wasn’t fully met, nedosiran showed a reduction in urinary oxalate excretion, suggesting it may be a promising treatment option for PH3 patients who currently lack effective therapies.*
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Background: Data on comorbidities in children on kidney replacement therapy (KRT) are scarce. Considering their high relevance for prognosis and treatment, this study aims to analyse the prevalence and implications of comorbidities in European children on KRT.

Methods: We included data from patients <20 years of age when commencing KRT from 2007 to 2017 from 22 European countries within the European Society of Paediatric Nephrology/European Renal Association Registry.

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Primary hyperoxaluria (PH) is an inherited disorder that results from the overproduction of endogenous oxalate, leading to recurrent kidney stones, nephrocalcinosis and eventually kidney failure; the subsequent storage of oxalate can cause life-threatening systemic disease. Diagnosis of PH is often delayed or missed owing to its rarity, variable clinical expression and other diagnostic challenges. Management of patients with PH and kidney failure is also extremely challenging.

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Background: Severe chronic kidney disease (CKD) in children and young adults has shown to be associated with abnormal brain development, which may contribute to neurocognitive impairments. We aimed to investigate risk factors for neurocognitive impairment and investigate the relation with structural brain abnormalities in young severe CKD patients.

Methods: This cross-sectional study includes 28 patients with severe CKD (eGFR < 30), aged 8-30 years (median 18.

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