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- W4366991610 abstract "Abstract Background Patterns of treatment failure and subsequent treatment in non‐small cell lung cancer (NSCLC) patients treated with osimertinib are scarcely known. We analyzed the disease progression during osimertinib treatment to identify potential treatment strategies. Methods We identified advanced NSCLC patients who commenced osimertinib treatment after progression on previous epidermal growth factor receptor (EGFR)‐tyrosine‐kinase inhibitor (TKI) from June 2014 to November 2018 from electronic records. Patients' tumor characteristics, efficacy outcomes, affected organs from radiology studies, and treatment modalities before and after osimertinib were analyzed. Results Eighty‐four patients were included. At osimertinib initiation, bone (50.0%) and brain (41.9%) were the commonest single metastatic sites, whereas thoracic involvement (73.3%) was more frequent than bone (27.4%) or brain (20.2%) metastasis during disease progression on osimertinib. Oligo‐progressive disease (PD) and central nervous system (CNS)‐sanctuary PD were observed in 15 (17.9%) and 3 (3.6%) patients, respectively. Most patients without brain metastasis (BM) at osimertinib initiation remained BM‐free (46/49, 93.9%), and 60% of patients (21/35) with pre‐existing BM showed intracranial disease control despite extracranial PD. The resistance mechanisms to osimertinib were explored in 23 patients (27.4%), and T790M‐loss was observed in 14 patients (60.9%) who had worse survival outcomes than those without T790M‐loss (progression‐free survival, 5.4 vs. 16.5 months, p = 0.02; overall survival, not reached, p = 0.03). Conclusion PD during osimertinib treatment occurred preferentially in the thorax and pre‐existing sites. Extracranial PD prevailed over intracranial PD regardless of baseline BM and prior brain radiation. These results support osimertinib's intracranial efficacy and may guide treatment strategies for EGFR‐ mutated NSCLC with BM." @default.
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- W4366991610 date "2023-04-25" @default.
- W4366991610 modified "2023-10-14" @default.
- W4366991610 title "Dynamics of disease progression during treatment with Osimertinib in patients with <i>EGFR</i> T790M‐positive non‐small cell lung cancer" @default.
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- W4366991610 doi "https://doi.org/10.1002/cam4.5926" @default.
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