Lymphoid infiltration as a prognostic variable for early-onset breast carcinomas

Area of Science:

• Oncology
• Immunology
• Pathology

Background:

• Lymphoid cell infiltration is a common feature in human tumors, including breast carcinomas.
• Tumor-infiltrating lymphocytes (TILs) are considered indicators of the host's immune response.
• The prognostic significance of TILs in breast cancer requires further elucidation, particularly concerning patient age.

Purpose of the Study:

• To investigate the frequency of lymphoid cell infiltration in primary breast carcinomas.
• To determine the correlation between lymphoid infiltration and patient survival rates.
• To assess the independence of lymphoid infiltration as a prognostic factor in breast cancer.

Main Methods:

• Analysis of 1919 cases of primary ductal and lobular infiltrating breast carcinomas.
• Long-term follow-up of patients to assess survival rates.
• Multivariate analysis to evaluate prognostic factors, including lymphoid infiltration, nodal status, and tumor size.

Main Results:

• A consistent frequency of 16-17% for infiltrated tumors was observed, irrespective of patient age.
• A significant positive correlation between lymphocyte presence and survival was found in patients under 40 (P = 0.0002).
• No association between lymphoid infiltration and prognosis was observed in patients aged 40 and older. Lymphoid infiltration was found to be an independent prognostic factor.

Conclusions:

• The prognostic value of lymphoid infiltration in breast cancer appears age-dependent, primarily benefiting younger patients.
• This age-specific effect may be attributed to differences in immune system efficiency or tumor biology.
• Lymphoid infiltration is an independent prognostic indicator for survival in early-onset breast cancer.