NCT04846647

Study of the Inappropriate Secretion of FGF23 in Patients Followed in Hospital in a Context of Hypophosphatemia

• Status: Completed
• Phase: —
• Study type: Observational
• Enrollment: 260 (actual)
• Sponsor: University Hospital, Clermont-Ferrand · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Accepted

Summary

The discovery of FGF23, the missing link in the long researched and finally found phosphate metabolism, marked a turning point in the understanding and physiopathology of specific hypophosphatemia. By inhibiting the renal reabsorption of phosphate and the production of calcitriol, FGF23 behaves like a hypophosphatemia hormone. Hypersecretion of FGF23 can occur in the case of genetic abnormalities (X-linked hypophosphatemic vitamin-resistant rickets, recessive or dominant hypophosphatemic rickets, McCune-Albright syndrome ...) or acquired abnormalities (oncogenic osteomalacia). Oncogenic osteomalacia can be induced by hyperproduction of FGF23 by benign tumours of mesenchymal origin. But more recently, several cases of malignant tumours secreting FGF23 have also been described (prostate, colon, breast, ovarian and lung cancers, pulmonary carcinoma, etc.)

Detailed description

To date, even if the incidence of FGF23-secreting tumours seems rare, no precise bibliographical data is available in the scientific literature. Future studies will have to address this issue in order not to underestimate the frequency of this complication. In this context, investigators would like to study the incidence of inappropriate FGF23 increase from a collection of biological samples carried out on 500 patients treated at the Clermont-Ferrand University Hospital for hypophosphatemia.

Conditions

• Hypophosphatemia Without Immediate Anteriority
• Unexplained Hypophosphatemia

Interventions

Type	Name	Description
BEHAVIORAL	unexplained hypophoshatemia	Collection of additional blood volume (approximately 10 mL) during blood tests provided as part of the usual medical care.

Timeline

• Start date: 2021-10-05
• Primary completion: 2022-04-25
• Completion: 2022-04-25
• First posted: 2021-04-15
• Last updated: 2023-05-11

Locations

2 sites across 1 country: France