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Cell Oncol. 2009;31(3):161-7. doi: 10.3233/CLO-2009-0466.

A fast, sensitive and accurate high resolution melting (HRM) technology-based assay to screen for common K-ras mutations.

Author information

1
Department of Pathology, VU University Medical Center, Amsterdam, The Netherlands.

Abstract

BACKGROUND:

Increasing evidence points to a negative correlation between K-ras mutations and patient's response to, or survival benefit after, treatment with EGFR-inhibitors. Therefore, rapid and reliable assays for mutational analysis of the K-ras gene are strongly needed.

METHODS:

We designed a high resolution melting (HRM) technology-based approach followed by direct sequencing to determine K-ras exon 1 (codons 12/13) tumour genotype.

RESULTS:

Reconstruction experiments demonstrated an analytical sensitivity of the K-ras exon 1 HRM assay following sequencing of 1.5-2.5% of mutated DNA in a background of wild-type DNA. Assay reproducibility and accuracy were 100%. Application of the HRM assay following sequencing onto genomic DNA isolated from formalin-fixed paraffin-embedded tumour specimens of non-small cell lung cancer (n=91) and colorectal cancer (n=7) patients revealed nucleotide substitutions at codons 12 or 13, including a homozygous mutation, in 33 (34%) and 5 (5%) cases, respectively. Comparison to conventional nested-PCR following cycle-sequencing showed an overall high agreement in genotype findings (kappa value of 0.96), with more mutations detected by the HRM assay following sequencing.

CONCLUSIONS:

HRM allows rapid, reliable and sensitive pre-screening of routine diagnostic specimens for subsequent genotyping of K-ras mutations, even if present at low abundance or homozygosity, and may considerably facilitate personalized therapy planning.

PMID:
19478384
PMCID:
PMC4618824
DOI:
10.3233/CLO-2009-0466
[Indexed for MEDLINE]
Free PMC Article

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