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Recovery from rituximab-associated persistent hypogammaglobulinaemia in children with nephrotic syndrome
Daishi Hirano1, Takuya Fujimaru2, Mayumi Sako3
1Department of Pediatrics, The Jikei University School of Medicine, Tokyo, Japan.
Insights
Rituximab treatment for childhood nephrotic syndrome can cause persistent hypogammaglobulinaemia. Many children do not recover IgG levels, and steroid-resistant cases have poorer outcomes, with agranulocytosis increasing infection risk.
Area of Science:
- Pediatric Nephrology
- Immunology
- Pharmacology
Background:
- Limited data exist on long-term outcomes of rituximab (RTX)-associated persistent hypogammaglobulinaemia in childhood idiopathic nephrotic syndrome (NS).
- Understanding risk factors for non-recovery and serious infections is crucial for managing this condition.
Purpose of the Study:
- To investigate the prognosis of childhood-onset idiopathic NS patients who developed persistent hypogammaglobulinaemia after RTX administration.
- To identify predictors of immunoglobulin G (IgG) level recovery and risk factors for serious infections.
Main Methods:
- A nationwide Japanese survey was conducted on patients with childhood-onset idiopathic NS treated with RTX.
- Prognosis, IgG recovery predictors, and serious infection risk factors were analyzed.
- Statistical analysis included hazard ratios and confidence intervals.
Main Results:
- Of 121 patients with persistent hypogammaglobulinaemia, only 26.3% recovered within a median 2.8-year follow-up.
- Steroid-resistant NS was a significant predictor of lower recovery probability (HR 0.28).
- 15.3% of patients experienced serious infections; agranulocytosis was a major risk factor during hypogammaglobulinaemia.
Conclusions:
- A substantial proportion of children with RTX-associated hypogammaglobulinaemia do not recover IgG levels.
- Patients with prior steroid-resistant NS have a significantly lower chance of recovery.
- Agranulocytosis in hypogammaglobulinaemic patients is linked to increased serious infection risk.
Background:
There are limited data on the long-term outcomes and risk factors for non-recovery after development of rituximab (RTX)-associated persistent hypogammaglobulinaemia among children with idiopathic nephrotic syndrome (NS).
Methods:
A nationwide Japanese survey was conducted to determine the prognosis of patients with childhood-onset idiopathic NS who developed persistent hypogammaglobulinaemia after RTX administration. Specifically, predictors of IgG level recovery and risk factors for serious infection were examined.
Results:
The cohort comprised 118 patients (66.1% boys; median age at initial RTX administration, 7.5 years). Among the 121 patients diagnosed with persistent hypogammaglobulinaemia, only 31 (26.3%) recovered within a median observation period of 2.8 years; approximately 70% of patients continued to exhibit persistent hypogammaglobulinaemia. Among the patients who recovered from hypogammaglobulinaemia, the median time to recovery was 14.1 months. Patients with a history of steroid-resistant NS were less likely to recover from persistent hypogammaglobulinaemia (hazard ratio 0.28; 95% confidence interval 0.09-0.87). In addition, of the 118 eligible patients, 18 (15.3%) developed serious infections requiring hospitalization, and the main risk factor for infection during hypogammaglobulinaemia was agranulocytosis (a well-known adverse effect of RTX in children).
Conclusions:
A significant portion of patients with RTX-associated persistent hypogammaglobulinaemia did not exhibit recovery even after 1 year. Moreover, the data indicate that patients with a history of steroid-resistant NS have a significantly lower probability of recovering from this condition. Agranulocytosis under hypogammaglobulinaemia was significantly associated with an elevated risk of serious infections.
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