Chi-Long Chen1,2, Chi-Kuan Chen3, Chung-Liang Ho4, Wei-Ming Chi5, Chien-Hsuan Yeh6, Shian-Pin Hu6, Peter Friebe7, Stuart Palmer6, Chin-Shiou Huang6. 1. Department of Pathology, Wan Fang Hospital and Taipei Medical University Hospital, Taipei, Taiwan. 2. Department of Pathology, College of Medicine, Taipei Medical University, Taipei, Taiwan. 3. Department of Pathology and Department of Laboratory Medicine, MacKay Memorial Hospital, Taipei, Taiwan. 4. Department of Pathology, National Cheng Kung University Hospital, Tainan, Taiwan. 5. Department of Laboratory Medicine, Taipei Medical University Shuang Ho Hospital, Taipei, Taiwan. 6. PlexBio Co., Ltd, 6F-16 1, No. 351, Yangguang St., Neihu District, Taipei, 11491, Taiwan. 7. PlexBio Co., Ltd, 6F-16 1, No. 351, Yangguang St., Neihu District, Taipei, 11491, Taiwan. peter.friebe@plexbio.com.
Abstract
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.
BACKGROUND:Colorectal cancer (CRC) is among the most frequently occurring cancers worldwide and its incidence is forecasted to increase. Testing for KRAS (Kirsten ratsarcoma 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.
Authors: Antonio Jimeno; Wells A Messersmith; Fred R Hirsch; Wilbur A Franklin; S Gail Eckhardt Journal: J Clin Oncol Date: 2009-01-05 Impact factor: 44.544
Authors: Sung Lee; Victoria H Brophy; Jianli Cao; Margot Velez; Corey Hoeppner; Stephen Soviero; H Jeffrey Lawrence Journal: Virchows Arch Date: 2011-12-16 Impact factor: 4.064