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- W4282942584 abstract "Abstract The primary mechanism of action for the chemotherapeutic 5-fluorouracil (5-FU) is inhibition of thymidylate synthase (TS), which leads to nucleotide imbalance and subsequent cellular death. Expression of TS has been suggested to be determined by a variable number of tandem repeats located within the TS enhancer region (TSER). TSER genotype has been inconsistently linked to 5-FU-related adverse events, including severe grade ≥3 drug-related toxicity. Our recent studies demonstrated that the number of repeats within the TSER, as well as the presence or absence of a polymorphism within each repeat, was significantly associated with 5-FU toxicity in 629 patients. Our findings are consistent with a model in which the number of upstream stimulatory factor (USF1) transcription factor binding sites in the TSER, which is determined both by repeat status and genotype within each repeat, defines TYMS expression and contributions to 5-FU toxicity risk. We present an updated nomenclature that concisely and unambiguously identifies both the number of repeats and the number of USF1 binding sites. The difficulty in obtaining clear genotypes within this highly repetitive and variable region limits the ability to integrate this biomarker into predictive tests. We present methodologies for assigning TSER genotypes using conventional and high-throughput sequencing, including whole genome sequence data. Our results are expected to promote the improved study of TSER genotype in future clinical studies and the integration of TSER status into clinical predictive tests for severe 5-FU toxicity. Citation Format: Huixing Huang, Dominic Schaerer, Remington Schmidt, Ting Zhang, Tanja K Froehlich, Kelly Bouchonville, Robert B Diasio, Ursula Amstutz, Carlo Largiadèr, Steven M Offer. Novel approach to thymidylate synthase genotype determination and utility as a biomarker of severe toxicity to 5-FU chemotherapy [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 5805." @default.
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- W4282942584 date "2022-06-15" @default.
- W4282942584 modified "2023-10-07" @default.
- W4282942584 title "Abstract 5805: Novel approach to thymidylate synthase genotype determination and utility as a biomarker of severe toxicity to 5-FU chemotherapy" @default.
- W4282942584 doi "https://doi.org/10.1158/1538-7445.am2022-5805" @default.
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