Objective:

To investigate the link between proliferation markers (PCNA, p16, Ki-67) and histopathological factors, exploring their prognostic value in breast cancer patients.

Approach:

• Study Design: Retrospective analysis of female breast cancer patients who underwent surgery, collecting data on demographics, clinical parameters, pathology, treatments, tumor staging, lymph node status, receptor status, and survival.
• Marker Analysis: Immunohistochemical staining was used to analyze PCNA, p16, and Ki-67 expression in paraffin blocks.

Key Findings:

• PCNA scores showed no association with demographic or clinical features.
• A significant inter-marker correlation was found between PCNA and p16.
• Higher Ki-67 index was associated with decreased ER and PR expression and decreased survival.
• Neither PCNA nor p16 demonstrated independent prognostic significance regarding overall survival.
• Ki-67 remains the most informative proliferation marker for prognostic stratification in breast cancer.

Interpretation:

The study indicates that while PCNA and p16 are inter-correlated, they lack independent prognostic value, whereas Ki-67 is significantly associated with hormone receptor status and overall survival.

Limitations:

• The study is retrospective and may have biases related to data collection.
• The sample size and diversity of the cohort may limit the generalizability of the findings.
• Further prospective studies with standardized scoring are needed to clarify the prognostic value of PCNA and p16.

Conclusion:

Ki-67 is the most informative marker for prognostic stratification in breast cancer.