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• W3047242480 abstract "Background. The aim of this study is to report tumoral genetic mutations observed at high sequencing depth in a lung squamous cell carcinoma (SqCC) sample. We describe the findings and differences in genetic mutations that were studied by deep next generation sequencing methods on the primary tumor and a liver metastasis samples. In this report, we also discuss how these differences may be involved in determining the tumor progression leading to the metastasis stage. Methods. We followed one lung SqCC patient who underwent FDG-PET scan imaging, before and after three months of treatment. We sequenced 26 well-known cancer-related genes, at an average of ~ 6000 X sequencing coverage, in two spatially distinct regions, one from primary lung tumor and the other from a distal liver metastasis which was present before the treatment. Results. A total of 3,922,196 read pairs were obtained across all two samples’ sequenced locations. Merged mapped reads showed several variants, from which we selected 36 with high confidence call. While we found 83% of genetic concordance between the distal metastasis and primary tumor, six variants presented substantial discordance. In the liver metastasis sample, we observed three de novo genetic changes, two on the FGFR3 and one on CDKN2A genes, and the frequency of one variant found on FGFR2 gene has been increased. Two genetic variants in HRAS gene, which were present initially in the primary tumor, have been completely lost in the liver tumor. The discordant variants have coding consequences as follow: FGFR3 (c.746C>G, p. Ser249Cys), CDKN2A (c.47_50delTGGC, p. Leu16Profs*9) and HRAS (c.182A>C, p. Gln61Pro). The pathogenicity prediction scores for the acquired variants, assessed using several databases, reported these variants as pathogenic, with a gain-of-function for FGFR3 and a loss-of-function for CDKN2A. The patient follow-up using imaging with 18F-FDG PET/CT before and after four cycles of treatment shows discordant tumor progression in metastatic liver compared to primary lung tumor. Conclusions. Our results report the occurrence of several genetic changes between primary tumor and distant liver metastasis in lung SqCC, among which non-silent mutations may be associated to tumor evolution during metastasis." @default.
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• W3047242480 date "2020-08-05" @default.
• W3047242480 modified "2023-10-17" @default.
• W3047242480 title "Next-Generation Sequencing at High Sequencing Depth as a Tool to Study the Evolution of Metastasis Driven by Genetic Change Events of Lung Squamous Cell Carcinoma" @default.
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• W3047242480 doi "https://doi.org/10.3389/fonc.2020.01215" @default.
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