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Genetic features and therapeutic relevance of emergent circulating tumor DNA alterations in refractory non-colorectal gastrointestinal cancers

Author

Listed:
  • David Hsiehchen

    (University of Texas Southwestern Medical Center)

  • Leslie Bucheit

    (Guardant Health Inc)

  • Dong Yang

    (Guardant Health Inc)

  • Muhammad Shaalan Beg

    (University of Texas Southwestern Medical Center)

  • Mir Lim

    (University of Texas Southwestern Medical Center)

  • Sunyoung S. Lee

    (University of Texas MD Anderson Cancer Center)

  • Pashtoon Murtaza Kasi

    (Weill Cornell Medicine, Englander Institute of Precision Medicine, Meyer Cancer Center)

  • Ahmed O. Kaseb

    (University of Texas MD Anderson Cancer Center)

  • Hao Zhu

    (University of Texas Southwestern Medical Center)

Abstract

Acquired resistance to systemic treatments is inevitable in most cancers, but the genetic basis for this in many cancer types has remained elusive due to constraints in obtaining tissue specimens longitudinally. In the management of gastrointestinal cancers, molecular profiling is conventionally performed at a single time point, although serial evaluations may yield biological insights that inform treatment decisions. We characterize genetic changes in serial liquid biopsies which provide real-time snapshots of tumor genetics and heterogeneity in refractory non-colorectal gastrointestinal cancers, and determine the clinical utility of repeat circulating tumor DNA (ctDNA) testing. In a national cohort of 449 patients with pancreatic, biliary, esophagogastric, and hepatocellular cancers, resistance to conventional therapies is broadly associated with tumor evolution. Emergent ctDNA alterations only detectable at progression occurs in 63% of patients and are frequently associated with treatment actionability. Tumor mutation burden is dynamic in cancers undergoing treatment, but is not associated with time to progression. Objective tumor responses in a case series of patients receiving treatment matched to emergent alterations show that repeat liquid biopsies may have clinical benefit by expanding treatment options in advanced gastrointestinal cancers.

Suggested Citation

  • David Hsiehchen & Leslie Bucheit & Dong Yang & Muhammad Shaalan Beg & Mir Lim & Sunyoung S. Lee & Pashtoon Murtaza Kasi & Ahmed O. Kaseb & Hao Zhu, 2022. "Genetic features and therapeutic relevance of emergent circulating tumor DNA alterations in refractory non-colorectal gastrointestinal cancers," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-35144-1
    DOI: 10.1038/s41467-022-35144-1
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    3. Christopher Abbosh & Nicolai J. Birkbak & Gareth A. Wilson & Mariam Jamal-Hanjani & Tudor Constantin & Raheleh Salari & John Le Quesne & David A. Moore & Selvaraju Veeriah & Rachel Rosenthal & Teresa , 2017. "Phylogenetic ctDNA analysis depicts early-stage lung cancer evolution," Nature, Nature, vol. 545(7655), pages 446-451, May.
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