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Collecting duct carcinomas represent a unique tumor entity based on genetic alterations
Frank Becker1, Kerstin Junker, Martin Parr
1Department of Urology, University of the Saarland, Homburg/Saar, Germany ; Urological Group Practice & Clinic Derouet/Pönicke/Becker, Boxberg Center, Neunkirchen, Germany ; for the German Network of Renal Cell Tumors, Jena, Germany.
Plos One
|October 30, 2013
Summary
Collecting duct carcinoma (CDC) shows distinct genetic alterations compared to upper tract urothelial carcinoma (UUT-UC). These findings suggest CDC is a unique kidney cancer entity, aiding in its diagnosis and understanding.
Area of Science:
- Oncology
- Genetics
- Urology
Background:
- Collecting duct carcinoma (CDC) is a rare renal neoplasm with aggressive behavior and poor prognosis.
- Differentiating CDC from urothelial carcinoma (UC) can be histologically challenging.
- Understanding the genetic landscape of CDC is crucial for clarifying its histological origin.
Purpose of the Study:
- To compare genetic alterations in CDC with those in urothelial carcinomas of the upper urinary tract (UUT-UC).
- To elucidate the distinct genetic profile of CDC and its potential origin.
- To provide insights into the classification of rare renal tumors.
Main Methods:
- Comparative genomic hybridization (CGH) was employed to analyze DNA copy number changes.
- Twenty-nine CDC samples were compared with twenty-six UUT-UC samples.
- Clinical data were correlated with CGH findings.
Main Results:
- CDC exhibited numerous chromosomal aberrations, with DNA losses more frequent than gains.
- Recurrent CDC losses were identified at 8p, 16p, 1p, and 9p; gains occurred at 13q.
- Significant genetic differences were observed between CDC and UUT-UC, notably losses at 9q, 13q, 8q, and gains at 8p in UUT-UC.
- No correlation was found between clinical course and specific genetic alterations.
Conclusions:
- Collecting duct carcinoma (CDC) possesses a unique genetic signature distinct from urothelial carcinomas of the upper urinary tract (UUT-UC).
- The genetic profile of CDC supports its classification as a unique entity among renal carcinomas.
- These findings contribute to a better understanding of rare kidney cancer subtypes.
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