The Premetastatic Lymph Node Niche in Gynecologic Cancer

Area of Science:

• Oncology
• Immunology
• Gynecologic Oncology

Background:

• Primary tumors may establish premetastatic niches in draining lymph nodes.
• The presence and characteristics of these premetastatic niches in gynecological cancers are not well understood.

Purpose of the Study:

• To investigate premetastatic niche factors in lymph nodes draining gynecological cancers.
• To compare immune cells, immuno-modulatory molecules, and extracellular matrix factors in different lymph node groups.

Main Methods:

• Retrospective monocentric study of 63 non-metastatic, 13 metastatic, and 21 control lymph nodes from gynecological cancer patients.
• Immunohistochemical analysis for CD8 cytotoxic T cells, CD163 M2 macrophages, S100A8/A9 myeloid-derived suppressor cells (MDSCs), PD-L1+ immune cells, and tenascin-C.

Main Results:

• PD-L1+ cells were higher in controls than cancer-draining nodes. Tenascin-C was elevated in metastatic nodes. Vulvar cancer nodes had higher PD-L1 than endometrial/cervical. Endometrial cancer nodes showed higher CD163 and lower CD8 than vulvar. Low-grade endometrial tumors had lower S100A8/A9 and CD163.

Conclusions:

• Gynecological cancer-draining lymph nodes are generally immunocompetent.
• Vulvar and high-grade endometrial cancer draining lymph nodes exhibit greater susceptibility to premetastatic niche factors.
• These findings highlight specific lymph node environments that may facilitate early metastasis in gynecological cancers.