Do columnar cell lesions exist in the male breast?

Area of Science:

• Oncology
• Pathology
• Male Breast Cancer Research

Background:

• Columnar cell lesions (CCLs) are recognized precursors to low-grade breast cancer in females.
• The role of CCLs in male breast carcinogenesis remains largely unknown.

Purpose of the Study:

• To investigate the presence and potential role of CCLs in male breast carcinogenesis.
• To examine male breast tissue samples for CCL morphology and immunohistochemical markers.

Main Methods:

• Surgical resections from male breast cancer (n=89), gynaecomastia (n=20), and normal autopsy specimens (n=5) were reviewed.
• Immunohistochemistry for cytokeratin 5/6 (CK5/6), CK14, and oestrogen receptor alpha (ER) was performed.
• Analysis focused on identifying CCL morphology and ductal epithelium characteristics.

Main Results:

• No lesions with convincing CCL morphology were identified in male breast cancer, gynaecomastia, or normal male breast tissue.
• Some ducts in male breast cancer showed features suggestive of CCLs but lacked typical morphology.
• Three-layered ductal epithelium, characteristic of gynaecomastia, was frequently observed.
• A few ducts in male breast cancer were found to be clonally negative for basal cytokeratins.

Conclusions:

• CCLs appear to be very uncommon in the male breast.
• These lesions are unlikely to play a significant role in male breast carcinogenesis.
• Further research may be needed to definitively exclude the existence of CCLs in males.