Proliferative activity in primary breast carcinomas is a salient prognostic factor

Area of Science:

• Oncology
• Pathology
• Cancer Research

Background:

• Breast carcinoma prognosis relies on various clinicopathologic factors.
• Investigating proliferative activity, including S phase fraction (SPF) and mitotic count, is crucial.
• Evaluating these factors in fresh and frozen tumor samples is essential for accurate assessment.

Purpose of the Study:

• To determine the prognostic impact of proliferative activity (mitotic count and SPF) in breast carcinoma.
• To compare the predictive value of proliferative activity against established prognostic factors.
• To assess the utility of SPF as a prognostic marker in clinical practice.

Main Methods:

• Analysis of 1984 previously untreated invasive breast carcinoma samples snap-frozen for flow cytometry.
• Evaluation of mitotic activity and S phase fraction (SPF).
• Multivariate analysis incorporating classic clinicopathologic prognostic factors.

Main Results:

• S phase fraction (SPF) combined with mitotic activity was the sole prognostic factor in lymph node-negative patients.
• Proliferative activity, alongside tumor size, was significant in lymph node-positive patients.
• The predictive value of proliferative activity surpassed traditional prognostic predictors and St. Gallen classification.

Conclusions:

• S phase fraction (SPF) is a valuable and reliable predictor of breast carcinoma survival, assessable in approximately 80% of cases.
• SPF, in conjunction with mitotic activity, should be integrated into daily oncologic practice for breast cancer management.
• Proliferative activity offers superior prognostic insight compared to current standards.