Factors affecting relapse in node-negative breast cancer. A multivariate analysis including the labeling index

Area of Science:

• Oncology
• Cell Biology
• Cancer Research

Background:

• Accurate prognostication is crucial for node-negative breast cancer patients.
• Understanding factors influencing relapse-free survival (RFS) is essential for treatment decisions.

Purpose of the Study:

• To investigate the prognostic value of the thymidine labeling index (LI) in node-negative breast cancer.
• To identify significant predictors of relapse-free survival (RFS) in this patient cohort.

Main Methods:

• Prospective study of 167 node-negative breast cancer patients between 1975-1982.
• Measurement of thymidine labeling index (LI) as a marker of cell proliferation.
• Univariate and multivariate Cox regression analyses to assess prognostic factors for RFS.

Main Results:

• High LI was associated with younger age, low estrogen receptor (ER) content, and high tumor grade.
• Overall 8-year RFS was 68%.
• Multivariate analysis identified LI as the sole significant prognostic factor for RFS (P=0.037).

Conclusions:

• Cell proliferation kinetics, specifically LI, is a critical prognostic factor in node-negative breast cancer.
• LI can help identify patients at high risk of relapse, guiding clinical management.
• Further research into proliferation markers may improve breast cancer prognostication.