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Pediatr Blood Cancer. 2017 Nov;64(11). doi: 10.1002/pbc.26547. Epub 2017 Apr 6.

Nephrogenic rests in Wilms tumors treated with preoperative chemotherapy: The UK SIOP Wilms Tumor 2001 Trial experience.

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Department of Cellular Pathology, University Hospital of Wales/Cardiff University School of Medicine, Cardiff, United Kingdom.
Molecular Haematology and Cancer Biology Unit, Institute of Child Health, University College London, London, United Kingdom.
Cancer Research UK Clinical Trials Unit, Sir Robert Aitken Building, School of Cancer Sciences, University of Birmingham, Birmingham, United Kingdom.
Department of Histopathology, Great Ormond Street Hospital NHS Foundation Trust, London, United Kingdom.



Nephrogenic rests (NRs) are abnormally persistent foci of embryonal cells, thought to be the precursor lesion of Wilms tumors (WTs). To date, their presence has not been systematically examined in WTs treated with preoperative chemotherapy.


A systematic analysis of the data on NRs in WTs treated with preoperative chemotherapy obtained from the UK cohort of the International Society of Pediatric Oncology (SIOP) WT 2001 Trial. The study was based on central pathology review of full sets of slides from pathological specimens, with a median of 28 slides reviewed per case.


NRs were identified in 40% of unilateral WTs, including 25% perilobar nephrogenic rest (PLNR), 9% intralobar nephrogenic rest (ILNR), 5% both PLNR and ILNR, and 1% nephroblastomatosis, and in 93% of cases with bilateral lesions. ILNRs were associated with stromal histology and a younger age at diagnosis and found frequently in patients with congenital anomalies associated with WT1 mutation. PLNRs were found frequently in patients with overgrowth syndromes.


The prevalence of NRs in WTs after preoperative chemotherapy observed in SIOP UK WT 2001 Trial is similar to the previously published data on NRs not treated with preoperative chemotherapy. Their epidemiology supports at least two pathways to Wilms tumorigenesis.


Wilms tumor; nephrogenic rests; preoperative chemotherapy

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