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Dx Dialogues: Genetic Testing for Cancer

Unlocking the genome: A new era in oncology care

How comprehensive genetic testing is reshaping cancer diagnosis and treatment

Unlocking the genome

Written by Stephanie Neary, PhD, MPA, PA-C. Medically reviewed
in July 2025.

The application of next-generation sequencing (NGS) is transforming oncology by providing detailed molecular insights that can inform treatment planning across tumor types. Unlike historical single-gene approaches, NGS-based tumor and germline profiling enables simultaneous analysis of multiple clinically relevant alterations.1

A recent synthesis of published outcomes found that NGS-informed cancer management is associated with significantly longer progression-free and overall survival in patients with advanced cancer, reinforcing the value of integrating molecular profiling into routine care.1 These findings were consistent across multiple tumor types and therapeutic strategies.

While the availability of broad testing panels increases the potential for identifying actionable mutations, clinical utility depends heavily on the underlying strength of gene-disease associations.2 Longitudinal analyses show that genes with well-established roles in cancer predisposition are more likely to yield diagnostically and therapeutically useful results.2 Conversely, inclusion of genes with limited supporting evidence can lead to higher rates of variants of uncertain significance (VUS), potentially complicating interpretation and care planning.2

AI-based tools are increasingly used to streamline interpretation, reduce uncertainty, and improve turnaround times in for testing.3 The integration of advanced informatics with sequencing has also enhanced the identification of pharmacogenomic variants, which can support safer use of both therapeutic and supportive agents.4 As molecular oncology advances, providers will need to balance comprehensive testing with evidence-based interpretation to ensure patients benefit from meaningful, precision-guided care.

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[1] Gibbs SN, Peneva D, Cuyun Carter G, et al. Comprehensive Review on the Clinical Impact of Next-Generation Sequencing Tests for the Management of Advanced Cancer. JCO Precis Oncol. 2023;7:e2200715. doi:10.1200/PO.22.00715

[2] Herrera-Mullar J, Horton C, Weaver A, et al. Understanding how gene-disease relationships can impact clinical utility: adaptations and challenges in hereditary cancer testing. Genome Med. 2025;17(1):73. Published 2025 Jul 1. doi:10.1186/s13073-025-01499-5

[3] Tiwari A, Mishra S, Kuo TR. Current AI technologies in cancer diagnostics and treatment. Mol Cancer. 2025;24(1):159. Published 2025 Jun 2. doi:10.1186/s12943-025-02369-9

[4] Koo H, Smith TB, Callaghan JT, et al. Return of Clinically Actionable Pharmacogenetic Results From Molecular Tumor Board DNA Sequencing Data: Workflow and Estimated Costs. Clin Pharmacol Ther. 2025;117(4):1017-1020. doi:10.1002/cpt.3545

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