Study of Therapeutic Efficacy of Anti-CD19 CAR-T Cell Therapy in Patients With MDR-SRNS

Inclusion Criteria: * 1\. Age ≥2 years old, gender unlimited; * 2.Diagnosed with SRNS according to the 2021 Kidney Disease: Improving Global Outcomes （KDIGO） Guidelines and have not achieved a complete response after 12 months of treatment with two standard doses of hormone replacement drugs with different mechanisms of action or relapse of disease activity after remission (at least one of the two drugs is a calcineurin inhibitor such as cyclosporine or tacrolimus; Other hormone replacement drugs include Mycophenolate Mofetil, cyclophosphamide, Taitacept or rituximab); Or if no remission has been achieved after 3 to 6 months of adequate treatment with one calcineurin inhibitor, if the researcher judges that the benefits outweigh the risks and the patient or guardian has fully informed consent, the patient can be considered for inclusion.Patients with other diseases, such as systemic lupus erythematosus, requiring long-term systemic treatment with glucocorticoids or immunosuppressants, may be considered for inclusion after the investigator determines that the benefits outweigh the risks and the patient or guardian has fully informed consent; * 3\. Renal biopsy was performed and the pathological type was determined to be minimal lesion nephropathy(MCD) or focal segmental glomerulosclerosis (FSGS); * 4\. The functions of important organs are basically normal: Cardiac function: Left ventricular ejection fraction (LVEF) ≥55% with no obvious abnormality in electrocardiogram; Renal…