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NCT03745521
Through observation of patients with X-linked hypophosphatemic rickets/osteomalacia (XLH) for up to 10 years, the study intends to collect data that allow achievement of the following objectives: 1. To determine medical characteristics of the disease and the disease process 2. To determine physical and psychological burden on patients as well as economic burden 3. To assess the efficacy and safety of the treatment of the disease
NCT06921720
Phosphate diabetes is defined by urinary phosphate wasting due to impaired tubular reabsorption. It can be classified based on either a genetic or acquired origin. Chronic hypophosphatemia causes rickets in children, leading to growth disorders, bone deformities, and bone pain. In adults, it results in osteomalacia, pseudofractures, as well as muscle fatigue and weakness during exertion. X-linked hypophosphatemia (XLH) is a common cause of hereditary rickets linked to renal phosphate loss due to elevated FGF23 levels, most often caused by mutations in the PHEX (Phosphate Regulating Endopeptidase X-Linked) gene. Clinical trials have already demonstrated significant improvements in the quality of life of patients with XLH following the approval of the anti-FGF23 antibody, Burosumab. However, there are other causes of phosphate diabetes, such as tumor-induced osteomalacia (TIO), proximal tubulopathies (Dent disease, cystinosis), or mutations in Npt2a/C. As described above, patients with phosphate diabetes report bone pain and variable muscle fatigue depending on the underlying cause. These symptoms can significantly impact quality of life by limiting physical activities early on. However, standard quality-of-life questionnaires often lack the specificity to accurately assess these symptom-related impairments. At present, the investigators lack objective biomarkers that can quantitatively assess subclinical metabolic abnormalities at the muscular level in these patients. Various data from animal models and preclinical studies suggest direct links between serum phosphate levels, intracellular phosphate (Pi), ATP production, and altered muscle metabolism. Muscle tissue requires energy, primarily derived from ATP hydrolysis. ATP is synthesized via mitochondrial oxidative phosphorylation, which is regulated by intracellular phosphate levels. In five XLH patients, older studies compared intracellular Pi levels to those of five healthy controls and showed a decrease in Pi without a change in intracellular ATP. Smith et al. found ATP concentrations within the lower limit of normal at rest, while Pesta et al. reported a decrease in muscle ATP concentration in hypophosphatemic mice, which normalized after correcting serum phosphate levels. Two recent studies using 31-phosphorus magnetic resonance spectroscopy (31P-MRS) showed no change in intracellular ATP levels in XLH patients, both before muscle activity and after burosumab treatment. However, these studies were conducted at rest. Yet, the main issue for patients lies in physical activity, as quality-of-life impairments often begin with limitations in daily physical tasks. Moreover, no current data are available on intracellular Pi or ATP levels in other forms of phosphate diabetes. These parameters can be measured in vivo, non-invasively, using 31P-MRS. This technique employs a standard 3T MRI scanner equipped with a multinuclear coil to detect phosphorus instead of protons. It allows for ATP, Pi, and phosphocreatine concentrations to be measured every 2 minutes and 45 seconds. The procedure is non-irradiating, requires no contrast injection, and focuses on the patient's leg, meaning the whole body does not need to be inside the MRI scanner. Additionally, in FGF23-mediated phosphate diabetes, calcitriol suppression leads to renin-angiotensin-aldosterone system (RAAS) activation and hypertension. In contrast, proximal tubulopathies cause salt wasting. The third sodium compartment (non-osmotically active sodium stored in subcutaneous and muscle tissue) can be assessed non-invasively using 23Na-MRI (sodium-23 MRI), which also uses a 3T (3 tesla) MRI scanner and a multinuclear coil to detect sodium signals under the same conditions as 31P-MRS. Patients with XLH also exhibit a distinct metabolic profile, with an increased risk of obesity, hypertension, left ventricular hypertrophy, and elevated uric acid levels. The goal of the study is to quantitatively measure intramuscular ATP, intracellular phosphate (Pi), intracellular pH, and phosphocreatine both before and during exercise in patients with phosphate diabetes. The study also aims to characterize the mitochondrial and metabolic profile of these patients and assess the non-osmotically active third sodium compartment in these disorders.
NCT03775187
Individual patient expanded access requests may be considered for patients who have no other treatment options
NCT04188964
A Phase 1/2, Open-label, Multicenter, Non-randomized Study to Assess the Safety, Tolerability, Pharmacokinetics and Efficacy of Burosumab in Paediatric Patients from Birth to Less than 1 Year of Age with X-linked Hypophosphatemia (XLH)
NCT02915705
The primary objective of this study is to evaluate the effect of KRN23 (burosumab) therapy in improving rickets in children with XLH compared with active control (oral phosphate/active vitamin D).
NCT04842032
The purpose of this study is to assess the safety, pharmacokinetics and efficacy of KRN23 in pediatric Chinese patients with XLH
NCT02537431
The primary objective of this study is to establish the effect of KRN23 treatment on improvement in XLH-associated osteomalacia as determined by osteoid volume (osteoid volume/bone volume, OV/BV).
NCT01571596
The primary purpose of this study is to assess the safety and efficacy of repeated subcutaneous (SC) injections of KRN23 in adult subjects with X-Linked Hypophosphatemia (XLH).
NCT00830674
The primary objective of this study is to assess the safety and tolerability of KRN23 after a single intravenous (IV) and subcutaneous (SC) administration in XLH patients.
NCT02750618
The primary objectives of the study are to: * Establish the safety profile of KRN23 for the treatment of XLH in children between 1 and 4 years old * Determine the PD effects of KRN23 treatment on serum phosphorus and other PD markers that reflect the status of phosphate homeostasis in children between 1 and 4 years old with XLH
NCT06067932
This study aimed to characterize foot pathologies using X-rays and clinical examination and assess related outcome scores in adolescents and adults with X-linked Hypophophatemia
NCT03489993
Hereditary hypophosphatemia encompasses rare genetic conditions characterized by renal phosphate wasting. Increased circulating levels of fibroblast growth factor 23 (FGF23), a key regulator of phosphorus metabolism, are critical to the pathophysiology of these diseases, most notably in X-linked hypophosphatemia (XLH). Increased FGF23 induces hypertrophy and scarring in the heart in part via stimulating the traditional renin-angiotensin system (RAS) pathway, angiotensin-converting enzyme (ACE)/angiotensin (Ang ll), particularly in patients with chronic kidney disease, but the effect of FGF23 on the heart in patients with FGF23-related hypophosphatemic diseases is unknown. In addition, the relationship between FGF23 and the angiotensin-converting enzyme 2 (ACE2)/angiotensin-(1-7) (Ang-(1-7) pathway of the RAS is unknown. The objective of this study is to describe the relationship between FGF23, which causes low phosphorus levels, and components of the RAS in the blood and urine to help the investigators understand why the disease occurs and how to better treat it. Subjects will be identified by querying the Electronic Medical Record according to medical diagnosis. Thirty subjects, 2-24 years of age, will be recruited from the tertiary care Pediatric Endocrinology and Pediatric Nephrology clinics at Brenner Children's Hospital. Inclusion criteria include a confirmed diagnosis of hereditary FGF23-related hypophosphatemia. Clinical data will be obtained from the Electronic Medical Record. Each subject will undergo study assessments at baseline, 6 months and 1 year that include blood work, an echocardiogram, and blood pressure measurements. The primary hypothesis is that subjects with higher Ang-(1-7) levels have lower rates of cardiac hypertrophy and thus are protected against high FGF23 levels. The secondary hypothesis is that subjects with higher Ang-(1-7) levels have lower systolic blood pressure.
NCT04872907
This study is a prospective, randomized, single-blind, split-mouth, national multicenter trial, comparing the efficacy of a self-etch adhesive system combined (SAM) with a flowable composite to that of a fluoride varnish for the prevention of spontaneous dental abscesses in children with XLH. For each patient, according to randomization, one side of the oral cavity is treated with the experimental treatment (application of the adhesive system to healthy anterior and posterior temporary teeth, and application of the flowable composite to healthy posterior temporary teeth), and the other side with the active comparator (fluoride varnish). The application process for both treatments is similar and will be renewed every 6 months (visits at 6, 12, 18 and 24 months) systematically for the SAM and the varnish, and in case of partial or total loss of the composite.