Prognostic factors in axillary lymph node-negative (pN-) breast carcinomas

Area of Science:

• Oncology
• Pathology
• Biostatistics

Background:

• Accurate prognostication is crucial for managing axillary lymph node-negative (pN-) breast carcinomas.
• Conventional histological grading has limitations in predicting patient outcomes.
• Novel histoquantitative factors require evaluation for their prognostic potential.

Purpose of the Study:

• To evaluate the prognostic value of mitotic indexes and nuclear factors in pN- breast carcinomas.
• To identify predictors of recurrence-free and disease-related survival.
• To compare the efficacy of these factors with conventional histological grading.

Main Methods:

• Histoquantitative analysis of 281 pN- breast carcinomas.
• Assessment of two mitotic indexes (mitotic activity index [MAI] and volume-corrected mitotic index [M/V]).
• Evaluation of nine nuclear factors, including nuclear perimetry and nuclear area standard deviation (S.D.), over a 12-year follow-up.

Main Results:

• M/V index, MAI, tumour size, and histological grade predicted recurrence-free survival.
• MAI, M/V index, tumour size, histological grade, and S.D. of nuclear perimetry predicted disease-related survival.
• MAI, adjuvant therapy, and tumour size were independent predictors of survival in Cox's analysis.

Conclusions:

• Mitotic indexes (MAI, M/V) and nuclear factors (nuclear perimetry, nuclear area S.D.) are significant predictors of survival and recurrence in pN- breast cancer.
• These factors may enhance or replace conventional histological grading for improved prognostication.
• The study supports the integration of these quantitative measures into routine breast cancer assessment.