[Expression of markers of epithelial-mesenchymal transition in breast cancer].

Objective: To study of the expression of epithelial-mesenchymal transition markers in various molecular subtypes of cancer and in benign breast diseases with different risks of malignant transformation.

Material And Methods: An immunohistochemical study of the expression of E-cadherin, collagen II, integrin 1β, cyclin D1 was carried out in breast tissue samples: 58 with invasive breast carcinoma of no special type and 17 with benign breast diseases with a high and low risk of malignant transformation.

Results: Patients with a triple negative molecular subtype are characterized by lower expression of collagen II compared with individuals with luminal A and B+ subtypes. A distinctive feature of patients with the HER2+ subtype was increased expression of cyclin D1 compared with the luminal A subtype, and in patients with the luminal B+ subtype, the expression of integrin 1β is higher than in the luminal B- and HER2+ subtypes. The expression of cyclin D1 in patients of both groups with benign diseases was lower than in all groups with invasive carcinoma, but at the same time, in patients with a low risk of malignant transformation, the expression of cyclin D1 was higher than in those with an increased risk.

Conclusion: The study revealed the relationship between the expression of markers and molecular subtypes of breast tumors, in addition, some patients with benign diseases were found who need further more careful monitoring and may be at risk for the development of malignancy.