[Minimal node affection in gastric carcinoma--pilote multicentric study results]

Area of Science:

• Oncology
• Surgical Pathology
• Cancer Research

Background:

• Lymphadenectomy is crucial for gastric cancer treatment.
• Standard hematoxylin-eosin staining may miss small tumor foci (micrometastasis, isolated tumor cells) in lymph nodes.
• Immunohistochemistry offers enhanced detection of these occult metastases.

Purpose of the Study:

• To assess the clinical and prognostic relevance of lymph node micrometastasis and isolated tumor cells in gastric cancer patients.
• To determine if advanced staining techniques improve patient outcome prediction.

Main Methods:

• A prospective, multicenter trial involving 73 gastric cancer patients undergoing radical resection.
• Standard hematoxylin-eosin staining of all lymph nodes.
• Immunohistochemistry using cytokeratin antibody for all hematoxylin-eosin negative lymph nodes.

Main Results:

• A total of 1245 lymph nodes were analyzed, with an average of 17.3 per patient.
• Hematoxylin-eosin staining revealed metastasis in 29% of nodes.
• Immunohistochemistry identified micrometastasis in 3% and isolated tumor cells in 6% of lymph nodes.

Conclusions:

• The presence of lymph node micrometastasis and isolated tumor cells in gastric cancer patients was not associated with a worse oncological outcome.
• Immunohistochemistry is not currently recommended as a routine diagnostic tool for lymph node examination in gastric cancer due to its cost and complexity.
• Further research may explore specific patient subgroups where these findings could be relevant.