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Background
Colorectal cancer (CRC) is among the most frequently occurring cancers worldwide and its incidence is forecasted to increase. Testing for
KRAS
(Kirsten rat sarcoma viral oncogene homolog) mutations in colorectal tissue biopsy samples has become a crucial tool to guide therapeutic decisions for personalized treatment.
Objective
The objective of this study was to determine the diagnostic sensitivity and specificity of the IntelliPlex™ KRAS G12/13 Mutation Kit using clinical specimens compared to Sanger sequencing as the reference method.
Methods
A total of 248 formalin-fixed paraffin-embedded (FFPE) tissue samples, with CRC tumors comprising more than 10% of the whole tissue sample, were included in the study and analyzed for specific
KRAS
mutations in codons 12 and 13. For samples with discordant results between Sanger sequencing and the IntelliPlex™ KRAS G12/13 Mutation Kit, Pyrosequencing was utilized to resolve the
KRAS
mutational status.
Results
Sequencing determined 153 specimens as
KRAS
wild-type genotype while the IntelliPlex™ KRAS G12/13 Mutation Kit confirmed 139 of the wild-type cases, resulting in a clinical specificity of 90.8% (95% confidence interval (CI) 85.12–94.91). All 95 specimens with a reported mutation in codons 12 or 13 of
KRAS
by sequencing were also reported as non-wild-type by the IntelliPlex™ KRAS G12/13 Mutation Kit, resulting in a clinical sensitivity to detect
KRAS
mutations of 100% (95% CI 96.19–100).
Conclusions
The IntelliPlex™ KRAS G12/13 Mutation Kit demonstrates suitable specificity and sensitivity for use in clinical laboratories to determine the mutational status of
KRAS
codons 12 and 13.