Distant recurrence and margin involvement in invasive breast cancer

Area of Science:

• Oncology
• Surgical Oncology
• Breast Cancer Research

Background:

• The impact of surgical margin involvement on distant recurrence (DR) in breast cancer patients remains unclear.
• Understanding margin status is crucial for predicting long-term outcomes and refining surgical strategies.

Purpose of the Study:

• To investigate the association between surgical margin width and involvement with distant recurrence (DR) and breast cancer mortality.
• To determine the optimal margin clearance for reducing recurrence and improving survival rates in breast cancer patients.

Main Methods:

• Analysis of Greater Manchester (GM) and National Cancer Registry (NCRAS) cohorts.
• Utilized Cox-proportional hazards models to assess factors associated with local recurrence (LR), DR, and breast cancer deaths.
• Evaluated margin status (clear, close, involved) in patients undergoing breast conservation surgery (BCS).

Main Results:

• Involved margins (<1mm) in BCS patients were significantly associated with increased hazard of DR (HR 1.73) and LR (HR 2.16).
• Analysis of NCRAS data revealed that 23.9% of BCS patients had margins <1mm, with a higher mortality rate (5.6%) compared to those with margins >1mm (3.4%).
• Involved margins (<1mm) after BCS, particularly in patients receiving chemotherapy, showed a HR of 1.33 for cancer death.

Conclusions:

• Margins greater than 1mm are linked to reduced distant recurrence and cancer mortality.
• Current guidelines should be updated to recommend a minimum surgical margin clearance of 1mm for breast cancer patients.
• Achieving adequate margin clearance is a critical factor in improving long-term survival after breast cancer surgery.