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CDKN2 mutation is infrequent in german hepatocellular carcinoma
M Volkmann1, F Stilgenbauer, W J Hofmann
1Zentrallabor, Medizinische Klinik und Poliklinik, Universität Heidelberg, Germany. Martin_Volkmann@med.uni-heidelberg.de
Oncology
|November 27, 1999
Summary
Alterations in the CDKN2 gene are rare in German hepatocellular carcinoma patients. This study found no homozygous deletions and only a common polymorphism, suggesting CDKN2 is not frequently altered in this cancer type.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Limited and conflicting data exist regarding CDKN2 alterations in hepatocellular carcinoma (HCC).
- Previous studies reported varying mutation rates in Chinese and Japanese HCC cohorts, and germline mutations in Swiss patients.
Purpose of the Study:
- To investigate the frequency of homozygous deletions and mutations of the CDKN2 gene in hepatocellular carcinoma from German patients.
Main Methods:
- Analysis of 23 HCC tumors from German patients.
- Detection of homozygous CDKN2 deletions using coamplification with the human tyrosine hydroxylase (TH) gene.
- Identification of CDKN2 mutations via PCR-single strand conformation polymorphism (PCR-SSCP) analysis and direct DNA sequencing.
Main Results:
- No homozygous deletions of CDKN2 were detected in the analyzed HCC samples.
- DNA sequencing revealed a common polymorphism (GCG-ACG substitution at codon 148) in exon 2 of CDKN2 in one tumor.
- These findings suggest CDKN2 alterations are infrequent in this cohort.
Conclusions:
- CDKN2 gene alterations, including homozygous deletions and mutations, do not appear to be a frequent event in the development of hepatocellular carcinoma in German patients.
- The study contributes to clarifying the role of CDKN2 in hepatocarcinogenesis, highlighting geographical variations in its alteration frequency.