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Related Experiment Video

Updated: Jan 18, 2026

A Three-dimensional Thymic Culture System to Generate Murine Induced Pluripotent Stem Cell-derived Tumor Antigen-specific Thymic Emigrants
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Programmed death-ligand 1 expression in surgically resected thymomas.

Luca Frasca1,2, Antonio Sarubbi1, Filippo Longo1

  • 1Department of Thoracic Surgery, Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro Del Portillo 200, 00128, Rome, Italy.

Updates in Surgery
|May 25, 2025
PubMed
Summary
This summary is machine-generated.

High programmed death ligand 1 (PD-L1) expression in thymomas is linked to increased recurrence risk. This finding suggests PD-L1 may serve as a prognostic biomarker for aggressive thymoma subtypes.

Keywords:
PD-L1RecurrenceThymectomyThymic epithelial tumoursThymoma

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Area of Science:

  • Oncology
  • Immunology
  • Pathology

Background:

  • Thymomas, common anterior mediastinum neoplasms, have limited treatment options for advanced stages.
  • The molecular characteristics of thymomas are not well understood.
  • Investigating biomarkers is crucial for improving patient outcomes.

Purpose of the Study:

  • To assess programmed death ligand 1 (PD-L1) expression in resected thymomas.
  • To determine the relationship between PD-L1 expression and the risk of thymoma recurrence.
  • To explore PD-L1 as a potential prognostic biomarker in thymoma.

Main Methods:

  • Retrospective analysis of patients undergoing complete thymectomy for thymoma.
  • Immunohistochemistry using the Ventana PD-L1 assay to quantify PD-L1 expression (<50% low, ≥50% high).
  • Kaplan-Meier and Cox regression analyses to correlate PD-L1 expression with disease-free survival.

Main Results:

  • High PD-L1 expression (≥50%) was found in 46.2% of patients.
  • Elevated PD-L1 expression significantly correlated with aggressive thymoma histotypes (B2/B3).
  • High PD-L1 expression was associated with reduced disease-free survival and worse prognosis (HR 5.4, p=0.028), alongside histology and Masaoka-Koga stage.

Conclusions:

  • Elevated PD-L1 expression, especially in aggressive thymomas, indicates its potential as a prognostic biomarker.
  • These results highlight the need for further investigation into immunotherapy for thymoma treatment.
  • PD-L1 status may guide therapeutic strategies for thymoma patients.