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Unexpected lymph node disease in resections for pulmonary metastases.

Gernot Seebacher1, Steffen Decker1, Jürgen R Fischer2

  • 1Department of Thoracic and Vascular Surgery, Klinik Löwenstein, Löwenstein, Germany.

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Summary

Mediastinal lymph node dissection during pulmonary metastasectomy reveals unexpected cancer in 17% of patients, especially those with breast or renal cancer. Lymph node sampling may be sufficient for these procedures.

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Area of Science:

  • Thoracic Surgery
  • Surgical Oncology
  • Pulmonary Medicine

Background:

  • Pulmonary metastasectomy is a standard treatment for various cancers.
  • The necessity of mediastinal lymph node (LN) dissection during these procedures remains debated.
  • This study investigates the incidence of unexpected LN disease in patients undergoing pulmonary metastasectomy.

Purpose of the Study:

  • To evaluate the frequency of unexpected lymph node involvement during pulmonary metastasectomy.
  • To determine the impact of lymph node dissection extent (radical vs. sampling) on outcomes.
  • To assess the clinical significance of lymph node status in patients with lung metastases.

Main Methods:

  • Retrospective analysis of 313 pulmonary metastasectomies in 209 patients with curative intent.
  • Exclusion of patients with known thoracic LN involvement or those who did not undergo lymphadenectomy.
  • Analysis of data based on the type of lymph node dissection (radical vs. sampling) and primary cancer type.

Main Results:

  • Overall incidence of unexpected tumor in mediastinal lymph nodes was 17%.
  • Higher rates of unexpected LN involvement were observed in breast cancer (35.5%) and renal cell carcinoma (20.8%) compared to colorectal cancer (9.2%).
  • No significant difference in 5-year survival was found between patients with tumor-negative and tumor-positive lymph nodes, nor between radical lymphadenectomy and lymph node sampling.

Conclusions:

  • Mediastinal lymph node dissection during pulmonary metastasectomy frequently uncovers unexpected disease, particularly in breast and renal cancers.
  • Routine lymph node dissection is recommended for accurate staging and therapeutic decisions.
  • Lymph node sampling appears to be sufficient, as radical removal did not significantly impact survival in this cohort.