Clear Cell Sarcoma of the Kidney

Area of Science:

• Pediatric Oncology
• Molecular Pathology
• Renal Tumors

Background:

• Clear cell sarcoma of the kidney (CCSK) is the second most frequent primary renal malignancy in children.
• Histological diversity presents diagnostic challenges for CCSK.
• Recent molecular studies have identified key genetic alterations in CCSK.

Purpose of the Study:

• To provide a concise review of recent advances in understanding CCSK.
• To update practicing pathologists on diagnostic strategies for CCSK.
• To highlight the role of molecular findings and potential diagnostic markers.

Main Methods:

• Review of recent molecular studies on CCSK.
• Analysis of genetic mutations and fusions in CCSK cases.
• Evaluation of immunophenotypic markers for CCSK diagnosis.

Main Results:

• Most CCSK cases exhibit BCOR exon 15 internal tandem duplications.
• A subset of CCSK cases show YWHAE-NUTM2 fusion.
• Other genetic alterations include BCOR-CCNB3 fusion and EGFR mutations.
• No specific immunophenotype exists for CCSK, but cyclin D1, nerve growth factor receptor, and BCOR are potential diagnostic aids.

Conclusions:

• Molecular profiling is crucial for accurate CCSK diagnosis.
• BCOR and YWHAE-NUTM2 alterations are significant findings in CCSK.
• Emerging markers like BCOR can assist pathologists in diagnosing CCSK.