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Sentinel lymph node pressure in breast cancer.
S David Nathanson1, Meredith Mahan
1Department of Surgery, Henry Ford Health System, 2799 West Grand Boulevard, Detroit, MI, USA. dnathan1@hfhs.org
Annals of Surgical Oncology
|June 1, 2011
Summary
Breast cancer metastasis increases intranodal pressure (INP) in sentinel lymph nodes (SLNs). High INP in metastatic SLNs can alter lymphatic flow, potentially promoting further spread to adjacent lymph nodes.
Area of Science:
- Oncology
- Surgical Pathology
- Cancer Metastasis Research
Background:
- Tumor-associated blood vessel leakiness elevates pressure in primary breast cancers.
- This increased pressure drives lymphatic flow to sentinel lymph nodes (SLNs).
- A similar mechanism may increase intranodal pressure (INP) in metastatic axillary SLNs.
Purpose of the Study:
- To investigate the relationship between breast cancer metastasis in axillary SLNs and intranodal pressure (INP).
- To determine if elevated INP in metastatic SLNs affects lymphatic flow dynamics.
Main Methods:
- Intraoperative INP was measured in 114 breast cancer patients' SLNs using a noncoring needle.
- SLNs were identified using radiocolloid and methylene blue.
- Pathological examination correlated INP with the presence and size of metastases.
Main Results:
- INP was significantly higher in tumor-containing SLNs (21.4 mmHg) compared to tumor-free SLNs (9.1 mmHg).
- Elevated INP strongly correlated with the size of SLN metastases.
- In some cases, high INP in metastatic SLNs redirected lymphatic flow to unaffected, lower-pressure nodes.
Conclusions:
- Breast cancer metastasis is associated with significantly elevated INP in axillary SLNs.
- High INP can alter lymphatic drainage pathways, potentially rerouting flow to secondary lymph nodes.
- Mechanical factors related to INP may influence the pattern of lymph node metastasis.
