Background: Osimertinib (AZD9291, Tagrisso) is a potent, irreversible third-generation epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI). Case Report: Our report demonstrates that osimertinib is able to inhibit the growth of a radiotherapy- and surgery-refractory EGFR T790M-positive brain metastasis in a patient with lung adenocarcinoma. Conclusion: These data show that re-biopsy in EGFR-mutated non-small cell lung cancer patients with acquired TKI resistance should be performed.

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