# The Dawn of Precision Medicine in Pediatric Nephrology: Lumasiran and the Era of siRNA Therapies for Primary Hyperoxaluria Type 1

## TL;DR

Lumasiran, an siRNA therapy, marks a new era in treating pediatric PH1 by targeting the root cause of oxalate overproduction and improving kidney outcomes.

## Contribution

This paper reviews the novel use of Lumasiran as the first disease-modifying siRNA therapy for pediatric PH1, highlighting its role in precision medicine.

## Key findings

- Lumasiran significantly reduces urinary oxalate excretion in children with PH1.
- Clinical trials show fewer kidney stone events and stabilized nephrocalcinosis with Lumasiran treatment.
- Lumasiran is generally well tolerated with mild injection-site reactions as the most common adverse event.

## Abstract

Primary hyperoxaluria type 1 (PH1) is a rare autosomal recessive disorder that causes progressive renal failure, nephrolithiasis, and nephrocalcinosis in children. It is characterized by hepatic overproduction of oxalate. Conventional management, which involves combined liver–kidney transplantation, vitamin B6 supplementation, and intense hydration, does not address the underlying metabolic defect for most patients and it generally provides only supportive care. The first approved disease-modifying treatment for pediatric PH1 is Lumasiran, a small interfering RNA (siRNA) therapeutic. By specifically inhibiting the hepatic glycolate oxidase mRNA, Lumasiran lowers the production of oxalate at its origin. Along with fewer kidney stone events and stabilization of nephrocalcinosis, clinical trials (ILLUMINATE-A/B/C) showed significant decreases in urinary oxalate excretion. The most frequently reported adverse event is mild injection-site reactions, which are generally well tolerated. The molecular mechanism, pharmacokinetics, and clinical effectiveness of Lumasiran in children with PH1 are compiled in this review. We go over possible long-term safety concerns, the impact of early intervention on renal outcomes, and the function of siRNA therapies in pediatric precision medicine. Furthermore, we highlight Lumasiran’s importance as a model for targeted treatment in uncommon pediatric kidney diseases by considering it in the larger context of RNAi-based therapies. A paradigm shift in pediatric nephrology is signaled by Lumasiran, which changes the therapeutic approach from supportive care to precision, targeted medicine. Further research and empirical data will clarify its long-term advantages, the best ways to treat it, and the possible use of siRNA technologies for other genetic renal disorders.