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Molecular mechanisms and therapeutic strategies for small‑cell lung cancer transformation after TKI therapy in EGFR‑mutated lung adenocarcinoma (Review)

  • Authors:
    • Hongbing Zhang
    • Hongye Gao
    • Penghu Gao
    • Hongyu Liu
    • Jun Chen
  • View Affiliations / Copyright

    Affiliations: Department of Lung Cancer Surgery, Tianjin Medical University General Hospital, Tianjin 300052, P.R. China, Molecular Diagnostic Laboratory of Tumor, Inner Mongolia Hospital of Peking University Cancer Hospital, Affiliated People's Hospital, Inner Mongolia Medical University, Hohhot, Inner Mongolia Autonomous Region 010030, P.R. China, Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Tianjin Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin 300052, P.R. China
    Copyright: © Zhang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 62
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    Published online on: May 6, 2025
       https://doi.org/10.3892/mco.2025.2857
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Abstract

Lung adenocarcinoma with epidermal growth factor receptor (EGFR) mutations is a common subtype of non‑small cell lung cancer (NSCLC). Although it responds well to EGFR‑tyrosine kinase inhibitors (EGFR‑TKIs), acquired resistance to EGFR‑TKIs inevitably occurs, which limits the use of the EGFR‑TKIs. One resistance mechanism is small‑cell transformation, which refers to the histological switch of EGFR‑mutant lung adenocarcinoma to a small‑cell lung cancer phenotype following TKI exposure. Small cell transformation is associated with a poor prognosis and requires different treatment modalities compared with NSCLC. The molecular mechanisms underlying small cell transformation are not fully elucidated, but may involve the loss of tumor suppressor genes, such as RB1 and TP53, and the activation of neuroendocrine pathways. In the present review, the current advances in the molecular characteristics and therapeutic regimens for small‑cell transformation in patients with EGFR‑mutated lung adenocarcinoma who are resistant to EGFR‑TKIs, are summarized.
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Spandidos Publications style
Zhang H, Gao H, Gao P, Liu H and Chen J: Molecular mechanisms and therapeutic strategies for small‑cell lung cancer transformation after TKI therapy in EGFR‑mutated lung adenocarcinoma (Review). Mol Clin Oncol 23: 62, 2025.
APA
Zhang, H., Gao, H., Gao, P., Liu, H., & Chen, J. (2025). Molecular mechanisms and therapeutic strategies for small‑cell lung cancer transformation after TKI therapy in EGFR‑mutated lung adenocarcinoma (Review). Molecular and Clinical Oncology, 23, 62. https://doi.org/10.3892/mco.2025.2857
MLA
Zhang, H., Gao, H., Gao, P., Liu, H., Chen, J."Molecular mechanisms and therapeutic strategies for small‑cell lung cancer transformation after TKI therapy in EGFR‑mutated lung adenocarcinoma (Review)". Molecular and Clinical Oncology 23.1 (2025): 62.
Chicago
Zhang, H., Gao, H., Gao, P., Liu, H., Chen, J."Molecular mechanisms and therapeutic strategies for small‑cell lung cancer transformation after TKI therapy in EGFR‑mutated lung adenocarcinoma (Review)". Molecular and Clinical Oncology 23, no. 1 (2025): 62. https://doi.org/10.3892/mco.2025.2857
Copy and paste a formatted citation
x
Spandidos Publications style
Zhang H, Gao H, Gao P, Liu H and Chen J: Molecular mechanisms and therapeutic strategies for small‑cell lung cancer transformation after TKI therapy in EGFR‑mutated lung adenocarcinoma (Review). Mol Clin Oncol 23: 62, 2025.
APA
Zhang, H., Gao, H., Gao, P., Liu, H., & Chen, J. (2025). Molecular mechanisms and therapeutic strategies for small‑cell lung cancer transformation after TKI therapy in EGFR‑mutated lung adenocarcinoma (Review). Molecular and Clinical Oncology, 23, 62. https://doi.org/10.3892/mco.2025.2857
MLA
Zhang, H., Gao, H., Gao, P., Liu, H., Chen, J."Molecular mechanisms and therapeutic strategies for small‑cell lung cancer transformation after TKI therapy in EGFR‑mutated lung adenocarcinoma (Review)". Molecular and Clinical Oncology 23.1 (2025): 62.
Chicago
Zhang, H., Gao, H., Gao, P., Liu, H., Chen, J."Molecular mechanisms and therapeutic strategies for small‑cell lung cancer transformation after TKI therapy in EGFR‑mutated lung adenocarcinoma (Review)". Molecular and Clinical Oncology 23, no. 1 (2025): 62. https://doi.org/10.3892/mco.2025.2857
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