Micro- and macro-metastasis in the axillary lymph node: A review

Area of Science:

• Oncology
• Pathology
• Surgical Oncology

Background:

• Sentinel lymph node (SLN) examination in invasive breast cancer is more detailed than historical axillary lymph node clearance.
• Increased detection of small metastatic foci (macrometastases, micrometastases, isolated tumor cells) in SLNs is common.
• The clinical impact of detecting these small nodal metastases is not well-defined.

Purpose of the Study:

• To review the clinical significance of small metastatic deposits in lymph nodes of breast cancer patients.
• To discuss the implications of findings from trials like ACOSOG Z0011 on managing nodal metastasis.
• To provide an overview of the biology of metastatic spread in breast cancer.

Main Methods:

• Review of current pathological examination standards for sentinel lymph nodes.
• Analysis of clinical significance of micrometastases and isolated tumor cells.
• Discussion of relevant clinical trials and their impact on treatment guidelines.

Main Results:

• Pathological examination of SLNs has improved detection of small metastatic foci.
• The clinical significance of micrometastases and isolated tumor cells in SLNs is still debated.
• The ACOSOG Z0011 trial has prompted re-evaluation of nodal metastasis management in early breast cancer.

Conclusions:

• Further research is needed to clarify the prognostic value of small metastatic deposits in SLNs.
• Management strategies for nodal metastasis in early invasive breast cancer require careful consideration in light of recent trial data.
• Understanding the biology of metastatic spread is crucial for accurate risk assessment and treatment planning.