Transformation from lung adenocarcinoma to pulmonary giant cell carcinoma following targeted therapy: a case report - Report - MDSpire

Transformation from lung adenocarcinoma to pulmonary giant cell carcinoma following targeted therapy: a case report

  • By

  • Shicheng Yuan

  • Qun Zhang

  • Yanling Xu

  • Yanfeng Wu

  • Qi Wang

  • July 14, 2026

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Clinical Report: Transition from Lung Adenocarcinoma to Pulmonary Giant Cell Carcinoma

Overview

This case report discusses a 71-year-old male patient with lung adenocarcinoma who developed resistance to sotorasib-targeted therapy, leading to a transformation to pulmonary giant cell carcinoma (PGCC).

Background

Pulmonary giant cell carcinoma (PGCC) is a rare and aggressive subtype of lung cancer, accounting for less than 1% of cases. The KRAS G12C mutation is a common driver in lung adenocarcinoma.

Data Highlights

No numerical data or trial data is presented in the article.

Key Findings

  • Transformation from lung adenocarcinoma to PGCC can occur following resistance to targeted therapy.
  • The patient had a KRAS G12C mutation and developed resistance to sotorasib.
  • Re-biopsy confirmed the transformation to PGCC.
  • PGCC is characterized by highly atypical tumor cells, rapid growth, and poor prognosis.

Clinical Implications

Re-biopsy may provide critical information for guiding subsequent treatment decisions.

Conclusion

This case highlights the transformation to PGCC following resistance to targeted therapy.

Related Resources & Content

  1. Frontiers in Oncology, Case Report: Personalized treatment in an advanced lung adenocarcinoma patient with EGFR exon 21 L858R mutations based on the patient-derived tumor organoids, 2026
  2. Frontiers in Oncology, Case Report: Successful conversion surgery following chemo-antiangiogenic therapy in a lung adenocarcinoma patient with active rheumatoid arthritis and rare EGFR mutation after immunotherapy-triggered flare, 2026
  3. Frontiers in Oncology, Metachronous multicentric giant cell tumor of bone with pulmonary metastases: a case report with 20-year follow-up, 2026
  4. Frontiers in Oncology, Histological transformation into pulmonary sarcomatoid carcinoma from lung adenosquamous carcinoma after radical resection of EGFR gene Exon-21 L858R mutation: a case report and literature review, 2026
  5. 2021 WHO Classification of Lung Cancer: Molecular Biology Research and Radiologic-Pathologic Correlation, RadioGraphics
  6. Therapy for Stage IV Non–Small Cell Lung Cancer With Driver Alterations: ASCO Living Guideline, Version 2024.3, Journal of Clinical Oncology
  7. 2021 WHO Classification of Lung Cancer: Molecular Biology Research and Radiologic-Pathologic Correlation | RadioGraphics
  8. Therapy for Stage IV Non–Small Cell Lung Cancer With Driver Alterations: ASCO Living Guideline, Version 2024.3 | Journal of Clinical Oncology
  9. Annual Review of Medicine

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