Objective:

To delineate the roles of CD169+ macrophages in tumor-draining lymph nodes and the tumor microenvironment, and to explore their potential as prognostic biomarkers and therapeutic targets in cancer.

Approach:

• Review of CD169+ Macrophages: The review discusses the distinct roles of CD169+ macrophages in tumor-draining lymph nodes and the tumor microenvironment, focusing on their interactions with cancer cells and immune populations.
• Clinical Significance: The review highlights the clinical significance of CD169+ macrophages as prognostic indicators and their potential in immunotherapeutic strategies, including specific approaches that target these cells.

Key Findings:

• CD169+ macrophages are critical in regulating immune responses in both tumor-draining lymph nodes and the tumor microenvironment, particularly in various cancer types.
• High densities of CD169+ macrophages in tumor-draining lymph nodes correlate with improved overall survival and progression-free survival in cancer patients.
• The origin and maintenance of CD169+ macrophages are influenced by a complex interplay of cellular interactions and molecular signaling within the lymph node microenvironment.

Interpretation:

CD169+ macrophages play a dual role in cancer, potentially promoting or suppressing tumor progression depending on the context.

Limitations:

• The functional consequences of CD169+ macrophages are context-dependent, varying by tissue niche, tumor type, and treatment context. Further studies are needed to clarify the mechanisms underlying the heterogeneity of CD169+ macrophage functions across different cancer types.

Conclusion:

CD169+ macrophages represent a promising target for enhancing antitumor responses and improving cancer diagnosis and treatment strategies.