GST-Theta1 Enzyme Expression Levels in Brain Tumor and Their Relationship with the Clinical Data of the Patients

Abstract

The most important drug metabolizing enzyme of the detoxification mechanism is known as Glutathione S-Transferase. GST enzymes may be associated with brain tumor epidemiology, clinical and demographic factors. The correlation between parameters such as changes in Glutathione S-transferase Theta1 proteins, tumor localizations, age, gender, alcohol use, smoking, chemotherapeutic/radiotherapeutic treatment status in normal and brain tumor tissues, diagnosed in neurosurgery department, were examined by immunohistochemistry. GST-Theta1 expressions were analyzed using immunostaining in samples from 149 patients diagnosed with brain tumors between 2016 and 2018. The mean age of the patient group was 49.44 years. 83 (58.45%) patients were male. After immunohistochemical staining, GST-T1 expression was found approximately 9,46 times higher in tumor tissues than in normal tissues (p<0.0001). Tumor tissues from patients who received chemotheraphy showed higher expression of GST-T1 than those who did not (p<0,05). In addition, GST-T1 expression level was observed at a significantly higher level in patients younger than 60 years of age compared to patients over 60 years (p<0.026; p<0.05). There was no statistically significant relationship between patients smoking behaviors, alcohol consumption, tumor localization and GST-T1 expressions. It is aimed to determine the GST-T1 protein expressions and to contribute to the examination of epidemiological and prognostic factors of brain tumors by comparing them with demographic and clinical data.