Department of Clinical Pathology;
“Pirogov” University Hospital;
Sofia;
Bulgaria;
Department of Gastroenterology;
University Hospital “Alexandrovska”;
Sofia;
Bulgaria;
First Surgical Clinic;
“Pirogov” University Hospital;
Sofia;
Bulgaria.;
Esophageal; Adenocarcinoma; Biomarkers; Cell; Cycle; Proliferation; Apoptosis;