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Emelyanova, Marina A.; Telysheva, Ekaterina N.; Orlova, Kristina V.; Ryabaya, Oxana O.; Snigiryova, Galina P.; Abramov, Ivan S.; Mikhailovich, Vladimir M.
Cancer genetics, January 2021, 2021-Jan, 2021-01-00, 20210101, Letnik: 250-251Journal Article
•A microarray-based method was evaluated to identify ctDNA BRAF mutations in melanoma patients.•The presence of BRAF mutations in cfDNA correlates with tumor progression (P=0.005).•Increased levels of cfDNA correlate with tumor progression (P=0.02).•Coincidence of genotypes between the tumor DNA and ctDNA was 65%. Background: Circulating tumor DNA (ctDNA) holds great potential for cancer therapy and can provide diagnostic and prognostic information before and during treatment. Methods: Plasma DNA samples from 97 melanoma patients, 20 healthy donors and 3 patients with benign skin tumors were analyzed by microarray analysis and droplet digital PCR (ddPCR). Results: A microarray for simultaneous detection of six BRAF V600 mutations in ctDNA has been developed. The method allows the detection of 0.05% mutated DNA from WT DNA background. For paired samples (pre-surgery plasma and tumor tissue) isolated from 74 patients, the concordance of genotypes between tumor DNA and ctDNA was 65% (48/74). BRAF mutations in ctDNA were detected in 27/50 patients with BRAF-positive tumors and in 3/24 patients with BRAF wild-type tumors. The presence of ctDNA BRAF mutations in 23 plasma samples from melanoma patients undergoing therapy correlated significantly with tumor progression (P=0.005). The increase in cell-free DNA levels measured by ddPCR also correlated with disease progression (P=0.02). The concordance of results obtained by microarray identification of BRAF mutations and those obtained by ddPCR was 91%. Conclusion: The novel microarray-based approach can be a useful non-invasive tool for accurate identification of ctDNA BRAF mutations to monitor disease progression.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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