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Updated: Oct 16, 2025
Quantification of Tumor Cell Adhesion in Lymph Node Cryosections
Published on: February 9, 2020
The lymphatic system and sentinel lymph nodes: conduit for cancer metastasis
Stanley P Leong1,2, Alexander Pissas3, Muriel Scarato3
1California Pacific Medical Center and Research Institute, San Francisco, CA, USA. leongsx@sutterhealth.org.
Insights
The lymphatic system, a network of vessels and nodes, filters bodily fluids. Cancer cells exploit this system, spreading through lymphatic vessels and lymph nodes, highlighting its role in metastasis.
Area of Science:
- Immunology
- Oncology
- Anatomy
Background:
- The lymphatic system comprises vessels and nodes that drain extracellular fluid, acting as a filtration network.
- It includes mucosa-associated lymphoid tissues like tonsils and Peyer's patches.
- Cancer cells can utilize lymphatic vessels as a pathway for metastasis.
Purpose of the Study:
- To review the structural integrity of the lymphatic system and its role in cancer cell spread.
- To emphasize the complexity of the lymphatic system in the context of cancer metastasis.
- To highlight the need for further research into the molecular mechanisms of cancer spread.
Main Methods:
- Review of existing literature on lymphatic system structure and function.
- Analysis of model systems, specifically melanoma and breast cancer sentinel lymph node studies.
- Emphasis on the progressive spread of early cancer via lymphatic pathways.
Main Results:
- The lymphatic system's structure facilitates cancer cell entry into vessels and lymph nodes, often serving as an early gateway for metastasis.
- Studies using melanoma and breast cancer models demonstrate progressive cancer spread through lymphatics.
- The lymphatic systems of internal organs are complex and challenging to study.
Conclusions:
- The lymphatic system plays a critical role in cancer metastasis, particularly in the early stages.
- Understanding cancer spread through the lymphatic system, especially to sentinel lymph nodes, is key to comprehending metastasis.
- Further research into the molecular mechanisms driving cancer spread via the lymphatic system is crucial.
Abstract:
The lymphatic system is a complicated system consisting of the lymphatic vessels and lymph nodes draining the extracellular fluid containing cellular debris, excess water and toxins to the circulatory system. The lymph nodes serve as a filter, thus, when the lymph fluid returns to the heart, it is completely sterile. In addition, the lymphatic system includes the mucosa-associated lymphoid tissue, such as tonsils, adenoids, Peyers patches in the small bowel and even the appendix. Taking advantage of the drainage system of the lymphatics, cancer cells enter the lymphatic vessels and then the lymph nodes. In general, the lymph nodes may serve as a gateway in the majority of cases in early cancer. Occasionally, the cancer cells may enter the blood vessels. This review article emphasizes the structural integrity of the lymphatic system through which cancer cells may spread. Using melanoma and breast cancer sentinel lymph node model systems, the spread of early cancer through the lymphatic system is progressive in a majority of cases. The lymphatic systems of the internal organs are much more complicated and difficult to study. Knowledge from melanoma and breast cancer spread to the sentinel lymph node may establish the basic principles of cancer metastasis. The goal of this review article is to emphasize the complexity of the lymphatic system. To date, the molecular mechanisms of cancer spread from the cancer microenvironment to the sentinel lymph node and distant sites are still poorly understood and their elucidation should take major priority in cancer metastasis research.
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