Expression of some molecular and biological markers in esophageal tumors of various stages and grades

Objectives: immunohistochemical study of the expression of molecular and biological markers (p53, bcl-2 and ki-67) in esophageal tumors of various stages and grades, and evaluation of the markers in the disease prognosis. Material and methods: the study included 30 patients of a retrospective group with stage II-III squamous cell carcinoma of the esophagus. Immunohistochemical study of paraffi n sections was performed using primary mouse monoclonal antibodies against p53, bcl-2 and ki67, and Reveal Polyvalent HRP-DAB Detection System. Results: diff erences in the rates and expression of molecular and biological markers (p53, bcl-2 and ki-67), controlling apoptosis and proliferation, depended on the tumor stage and grade. Conclusions: fdvanced cancer of the esophagus demonstrated an increase in rates and expression of p53+ and ki-67, as well as in the proliferative activity of tumor cells. Bcl-2 expression was more frequent and intensive in stage II tumors, compared to stage III. Esophageal tumors of higher grades were characterized with higher rates and expression of p53 and ki-67, and conversely for the bcl-2 expression. Th e revealed diff erences can be used in the disease prognosis.