This study is a multicenter, randomized controlled crossover trial aimed to evaluate the efficacy and safety of dapagliflozin in the treatment of hereditary kidney disease with proteinuria in children

Chronic kidney disease (CKD) poses a significant public health threat to children, with hereditary kidney diseases exhibiting limited therapeutic efficacy in reducing proteinuria. Global studies have demonstrated that dapagliflozin significantly reduces proteinuria in adults with CKD; however, its role in pediatric hereditary kidney diseases lacks strong evidence .This study aims to investigate the efficacy and safety of dapagliflozin in children with proteinuric hereditary kidney diseases.

This is a multicenter, open-label, block-randomized, crossover clinical trial with 1:1 allocation. A total of 44 participants will be enrolled to compare the efficacy and safety of dapagliflozin combined with standard renin-angiotensin-aldosterone system inhibitor (RAASi) therapy versus RAASi therapy alone.

The primary endpoint is the change in 24-hour urinary protein levels from baseline to 12 weeks of treatment. Secondary endpoints include: urinary protein-to-creatinine ratio (UPCR), urinary albumin-to-creatinine ratio (UACR), serum albumin levels, estimated glomerular filtration rate (eGFR), blood pressure changes, and body weight changes.

Inclusion Criteria:

• Confirmed diagnosis of hereditary kidney disease (identification of pathogenic genes through molecular genetic testing; for Alport syndrome, molecular diagnosis is not necessarily required if diagnosed based on clinical and pathological findings; for those with a clear family history and a high clinical suspicion of hereditary kidney disease).
• 24 - hour urinary protein level > 0.2 g or urinary protein to creatinine ratio (UPCR) > 0.2 mg/mg.
• Calculate the estimated glomerular filtration rate (eGFR) using the Schwartz formula (36.5 * height in cm / serum creatinine in μmol/L), with eGFR ≥ 60 ml/min/1.73 m².
• Stable use of the basic treatment drug RAASi (including ACEI/ARB) for more than 4 weeks, and no dosage adjustment during the treatment period.
• Willingness to sign the informed consent form.

Exclusion Criteria:Exclusion applies if any of the following criteria are met:

• Treatment with hormones/immunosuppressive agents within the previous 4 weeks.
• Treatment with SGLT2 inhibitors within the previous 4 weeks.
• Comorbid diabetes.
• Uncontrolled urinary tract infection.
• Evidence of urinary tract obstruction such as dysuria.
• Blood pressure below the 5th percentile for the same gender, age, and height.
• Organ transplantation.
• Tumor.
• Presence of any of the following definite evidence of liver disease: ALT/AST reaching 2 times the normal value, hepatic encephalopathy, esophageal varices, or portal shunt surgery.
• Comorbid medical conditions that may affect drug absorption, distribution, metabolism, and excretion, including but not limited to any of the following: active inflammatory bowel disease within the past 6 months, history of major gastrointestinal surgery (such as gastrectomy, gastroenterostomy, intestinal resection), gastrointestinal ulcer, gastrointestinal or rectal bleeding within the past 6 months, pancreatic injury or pancreatitis within the past 6 months.
• Subjects at risk of dehydration or volume depletion, which may affect drug efficacy or safety.
• Participation in other drug trials within the previous 4 weeks.
• Blood loss exceeding 400 ml within the previous 8 weeks.
• Poor past medication compliance or unwillingness to complete the trial.
• Any other medical conditions that may place the patient at a higher risk due to participation in this study.

gender based.