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Updated: Jan 1, 2026

In Vivo, Percutaneous, Needle Based, Optical Coherence Tomography of Renal Masses
Published on: March 30, 2015
BCOR-CCNB3 fusion-positive clear cell sarcoma of the kidney
Hyojeong Han1, Kelsey C Bertrand1, Kalyani R Patel2
1Section of Hematology/Oncology, Department of Pediatrics, Texas Children's Hospital/Baylor College of Medicine, Houston, Texas.
Abstract:
Clear cell sarcoma of the kidney (CCSK) is the second most common malignant pediatric renal tumor. Two of the recurrent somatic alterations reported in CCSK are BCL-6 corepressor (BCOR) internal tandem duplication (ITD) and YWHAE-NUTM2B/E gene fusion. A minority of patients with CCSKs have other rare somatic alterations. We report two patients with CCSK showing BCOR-CCNB3 (where CCNB3 is cyclin B3) fusion, who had similar clinical presentation of a large renal mass with tumor thrombus extending through the inferior vena cava into the right atrium and a favorable response to chemotherapy. We recommend BCOR-CCNB3 fusion testing for all patients with CCSK who lack BCOR-ITD or YWHAE-NUTM2B/E gene fusions.
Insights
Clear cell sarcoma of the kidney (CCSK) can feature a BCOR-CCNB3 gene fusion. This finding in pediatric renal tumors suggests a need for specific genetic testing in CCSK cases lacking other common alterations.
Area of Science:
- Pediatric Oncology
- Molecular Pathology
- Genetics
Background:
- Clear cell sarcoma of the kidney (CCSK) is a significant pediatric renal malignancy.
- Common genetic alterations include BCOR-ITD and YWHAE-NUTM2B/E fusions.
- Rare somatic alterations also occur in CCSK.
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