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Blood-based RAS mutation testing: concordance with tissue-based RAS testing and mutational changes on progression

Germetaki, Theodora, Nicholls, Camille, Adams, Richard A, Braun, Michael, Rogan, Jane, Moghadam, Sharzad, Lenfert, Eva, Lukas, Antje, Edelstein, Daniel L, Jones, Frederick S and Saunders, Mark P 2020. Blood-based RAS mutation testing: concordance with tissue-based RAS testing and mutational changes on progression. Future Oncology 16 (28) , pp. 2177-2189. 10.2217/fon-2020-0523

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Aim: To determine the concordance between plasma and tissue RAS mutation status in metastatic colorectal cancer patients to gauge whether blood-based testing is a viable alternative. We also evaluated the change in mutation status on progression. Materials/methods:RAS testing was performed on plasma from patients commencing first-line therapy (OncoBEAM™ RAS CEIVD kit). Results were then compared with formalin-fixed paraffin embedded tumor samples. Results: The overall percentage agreement (concordance) was 86.0% (86/100), which demonstrates that blood-based testing is an alternative to tissue-based testing. Reproducibility was 100% between three laboratories and 20% showed changes in their RAS mutational status on progression. Conclusion: These results show good concordance between tissue and plasma samples and suggest the need for longitudinal plasma testing during treatment to guide management decisions.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Centre for Trials Research (CNTRR)
Publisher: Future Medicine
ISSN: 1479-6694
Date of First Compliant Deposit: 13 May 2021
Date of Acceptance: 2 July 2020
Last Modified: 13 May 2021 15:30

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