In this video, Benjamin P. Levy, MD, assistant professor of oncology and clinical director of Medical Oncology for the Sidney Kimmel Cancer Center at Johns Hopkins Medicine, stresses the importance of repeat testing when treating patients with non-small cell lung cancer (NSCLC). Among the situations listed for retesting are initial liquid or tissue biopsies that are inconclusive, evidence of resistance to therapy, and progression after genotype-directed therapies.

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