The goal of this observational study is to create, manage and analyze a multicenter national database of patients affected by diseases of phosphate metabolism, aimed at collecting and studying anamnestic, diagnostic, genetic, clinical, and therapeutic data in a relatively wide number of patients with these rare inherited metabolic disorders in Italy.
The study will include 28 specialist clinical centers of endocrinology, pediatric endocrinology, and pediatrics, located throughout the Italian territory, and to which patients refer from all the 20 regions of Italy.
Data will be collected over time, both in retrospective and prospective manners, during the 10-year duration of the study, starting from the recruiting visit (basal visit) and then during each follow-up visits patients will undergo for the control of disease at the recruiting clinical centers.
Collected data will include both the most classic traits of each disease and the less common ones, with the final goal of refining and deepening medical knowledge in the field of these rare inherited metabolic disorders, and, thus, to be able to define optimal tailored diagnostic, clinical, and therapeutic management of patients, improving their quality of life.
The main aspects this observational study aims to assess and clarify are:
1. Evaluation of prevalence and incidence of diseases of phosphate metabolism in Italy, globally and for single different disorders 2. Clinical and biochemical characterization of different diseases of phosphate metabolism (according to single disorders and different genetic base), through both cross-sectional and longitudinal analyses of collected data 3. Evaluation of skeletal health and bone fragility in patients with diseases of phosphate metabolism, globally and based on single phosphate metabolism disorder, gender, and age 4. Self-evaluation of health-related quality of life in patients with a disease of phosphate metabolism 5. Over time evaluation of responses to therapies in patients with diseases of phosphate metabolism.
The study will include a single cohort of female and male patients of any age, affected by a disease of phosphate metabolism. The study does not include either any control group/comparison group or healthy volunteers.
The study itself does not involve any medical intervention or drug administration. Therapies for which response outcomes will be collected in the database, are those commonly employed for the treatment of diseases of phosphate metabolism, regardless of patients' inclusion in this observational study.
Clinical and/or genetic diagnosis of a rare disease of phosphate metabolism
None
A single cohort of female and male patients of any age, affected by a disease of phosphate metabolism.
Cohort
Other
Not listed
Prevalence and incidence evaluation
Evaluation of prevalence and incidence of diseases of phosphate metabolism, globally and for single different disorders
Clinical characterization of diseases of phosphate metabolism
Detailed clinical characterization of each different rare disease of phosphate metabolism performed through retrospective and prospective cross-sectional and longitudinal collection of available data on disease clinical history, over time clinical manifestations and their age of onset, and related signs and symptoms. For each disease, the collected clinical features will be analyzed through descriptive statistical analyses and expressed as percentage of frequency for categorial data and as mean/median value for continuous data.
Biochemical parameters of phosphate metabolism
Over time assessment of metabolism of phosphate, in each different rare disease, through the collection of data on specific biochemical parameters, at baseline visit and during follow-ups: * Serum phosphate (mg/dl) * 24h phosphaturia (mg/24h) Each biochemical parameter will be, singularly, categorized as reduced levels, normal levels, or increased levels, according to its reference values, and analyzed through descriptive statistical analyses as percentage of frequency.
Biochemical parameters of kidney function
Over time assessment of kidney function, in each different rare disease of phosphate metabolism, through the collection of data on specific urinary parameters, at baseline visit and during follow-ups: * Creatinine (mg/dl) * Clearance of creatinine (ml/min) * Estimated Glomerular Filtration Rate (eGFR) (mL/min/1.73 m2) * Spot proteinuria (mg/dl) * 24h proteinuria (mg/24h) Each biochemical parameter will be, singularly, categorized as reduced levels, normal levels, or increased levels, according to its reference values, and analyzed through descriptive statistical analyses as percentage of frequency.
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