EBUS-TBNA in Extrathoracic Malignancies: Diagnostic and Prognostic Implications

Area of Science:

• Pulmonology
• Oncology
• Diagnostic Imaging

Background:

• The utility of endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) for evaluating mediastinal lymph nodes (MLN) in patients with extrathoracic malignancies (EM) remains debated.
• Accurate staging and prognostication are crucial for managing patients with EM.

Purpose of the Study:

• To determine the diagnostic yield of EBUS-TBNA in assessing abnormal MLN in patients with EM.
• To evaluate the prognostic significance of EBUS-TBNA findings in this patient population.

Main Methods:

• A retrospective analysis was conducted on 161 patients with EM and abnormal MLN identified via CT and/or PET scans.
• EBUS-TBNA was performed to sample MLN, and diagnostic performance metrics (sensitivity, specificity, PPV, NPV) were calculated.

Main Results:

• EBUS-TBNA demonstrated high diagnostic accuracy for malignancy (sensitivity 88%, specificity 100%, PPV 100%, NPV 87%).
• Diagnostic yield was consistent across EM types, except for head and neck cancers, which showed a lower NPV (67%).
• Neoplastic involvement of MLN detected by EBUS-TBNA was associated with significantly worse overall survival and cancer-specific survival.

Conclusions:

• EBUS-TBNA is a valuable tool with a high diagnostic yield for MLN assessment in patients with EM.
• Clinicians should be aware of the decreased NPV in head and neck cancer patients.
• Positive EBUS-TBNA findings for malignancy carry significant prognostic implications, impacting patient survival.