New Consensus Standardizes Wilms Tumor Surgery for Children

A new expert consensus provides a standardized framework for the surgical management of unilateral Wilms tumor (WT), the most common primary malignant kidney tumor in children. Developed by the Oncology Surgery Group and Urology Surgery Group of the Pediatric Surgery Branch of the Chinese Medical Association, the guidance was published (DOI: 10.1136/wjps-2026-001204) in World Journal of Pediatric Surgery on June 17, 2026. The consensus addresses wide variations in surgical practice, including upfront surgery versus preoperative chemotherapy, biopsy, nephron-sparing surgery (NSS), lymph node sampling, renal vessel control, tumor thrombus, rupture, recurrence, metastases, minimally invasive surgery (MIS), horseshoe kidney, and special age groups. Based on 17 clinical questions, the authors provide 34 recommendations aimed at reducing tumor rupture, iatrogenic progression, recurrence, and unnecessary organ removal while preserving renal function and improving long-term outcomes.

The consensus prioritizes complete local resection, accurate lymph node staging, and histological evaluation. Immediate radical nephrectomy is recommended for resectable tumors, while preoperative chemotherapy is advised for selected patients with high-risk or initially unresectable disease. Immediate surgery is discouraged in certain circumstances, such as confirmed germline WT1 mutation, solitary kidney, severe anesthetic risk, or tumor thrombus above the hepatic veins. Percutaneous biopsy is generally not recommended but is suggested when renal origin is unclear, benign or non-WT disease is suspected, or in stage IV patients and those older than 10 years. The guidance emphasizes adequate lymph node sampling—ideally 6 to 10 nodes from specified sites—to improve staging and keep the false-negative rate below 10%. It also covers tumor thrombus management, NSS criteria, MIS use in selected cases, and follow-up.

The consensus is intended as a practical framework rather than a rigid protocol, stressing multidisciplinary discussion for complex cases and viewing conversion from MIS to open surgery as sound judgment. It targets pediatric surgeons, oncologists, urologists, radiologists, and pathologists, and may also guide referral and multidisciplinary planning in resource-limited settings. The authors call for future studies to refine patient selection for NSS and MIS, improve rupture prediction, standardize lymph node mapping, and clarify anticoagulation and radiotherapy decisions. Ultimately, the consensus aims to support more consistent, individualized care for children with unilateral WT, balancing oncologic control with renal preservation.