Myofibroblasts in human breast tumors: an ultrastructural study

Area of Science:

• Oncology
• Cell Biology
• Pathology

Background:

• Myofibroblasts are specialized fibroblasts known for their role in tissue repair and remodeling.
• Their presence and function in the tumor microenvironment are increasingly recognized as critical.
• Understanding myofibroblast behavior in breast cancer is essential for comprehending tumor progression.

Purpose of the Study:

• To investigate the presence and distribution of myofibroblasts in various types of breast tumors.
• To determine the relationship between myofibroblasts and tumor structures.
• To explore the potential role of myofibroblasts as activated mesenchymal cells in breast cancer.

Main Methods:

• Electron microscopy was utilized to examine tumor tissue samples.
• Histopathological analysis was performed on 9 breast tumor cases, including intraductal papillomatosis, papillary carcinoma, and infiltrating duct carcinomas.
• Cellular distribution and morphological characteristics of myofibroblasts were assessed.

Main Results:

• Myofibroblasts were consistently observed in the stroma of all breast tumor cases examined.
• In tumors with tubule- or duct-like structures, myofibroblasts frequently surrounded these formations, analogous to delimiting fibroblasts in normal breast tissue.
• In infiltrating duct carcinomas lacking tubule-like structures, myofibroblasts were found dispersed within the stroma.

Conclusions:

• Myofibroblasts are a common stromal component in breast tumors.
• Their localization suggests a role in defining tumor architecture and potentially interacting with tumor cells.
• The findings support the hypothesis that myofibroblasts may represent activated mesenchymal cells within the tumor microenvironment.