Diagnostic Accuracy of Immunohistochemistry in Detecting MGMT Methylation Status in Patients with Glioma

Sahara, Nita and Hartanto, Rachmat Andi and Yoshuantari, Naomi and Dananjoyo, Kusumo and Widodo, Irianiwati and Malueka, Rusdy Ghazali and Dwianingsih, Ery Kus (2021) Diagnostic Accuracy of Immunohistochemistry in Detecting MGMT Methylation Status in Patients with Glioma. Asian Pacific Journal of Cancer Prevention, 22 (12). 3803 – 3808. ISSN 15137368

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Abstract

Background: The O6-methylguanine-DNA methyltransferase (MGMT) gene prevents mismatch in DNA replication and transcription by repairing mutagenic DNA lesions. MGMT is a predictor biomarker of chemotherapy in high-grade and low-grade gliomas based on high-risk clinical conditions. It also can be used for therapeutic decisions to predict hypermutation in recurrence in newly diagnosed low-grade gliomas. The gold standard examination for the methylation is Polymerase Chain Reaction (PCR). However, this technique is not widely available in Indonesia for daily practice. Thus, an uncomplicated and simpler method such as immunohistochemistry (IHC) is needed as an alternative examination. This study aimed to predict the diagnostic accuracy of immunohistochemistry (IHC) in detecting the methylation status of O6-methylguanine-DNA methyltransferase (MGMT) in glioma. Methods: This research was a cross-sectional study using formalin-fixed paraffin embedded (FFPE) tissue samples of glioma patients, dating between October 2017 until March 2021. Diagnosis of glioma was established based on clinical, radiological, and histopathological findings. MGMT methylation status was investigated using the IHC and PCR techniques. Diagnostic value of IHC was analyzed, with PCR as a gold standard method. Optimum threshold to determine positivity of IHC was determined by the Area Under the Curve (AUC) on Receiver Operating Characteristics (ROC) curve and Youden index. Results: Among 75 samples examined, 29 (38.7) patients were methylated. IHC detected MGMT methylation with sensitivity of 86.2, specificity of 63.0, positive predictive value of 59.5, negative predictive value of 87.9 and accuracy of 72.0. The AUC was 0.746, indicating moderate diagnostic value. Optimum positivity threshold of the IHC examination based on Youden Index was 10. Conclusion: IHC examination can be used to detect © 2021. Asian Pacific Journal of Cancer Prevention.All Rights Reserved

Item Type: Article
Additional Information: Cited by: 10; All Open Access, Gold Open Access, Green Open Access
Uncontrolled Keywords: Central Nervous System Neoplasms; Cross-Sectional Studies; DNA Methylation; DNA Modification Methylases; DNA Repair Enzymes; Female; Glioma; Humans; Immunohistochemistry; Indonesia; Male; Middle Aged; Polymerase Chain Reaction; Predictive Value of Tests; Reproducibility of Results; Sensitivity and Specificity; Tumor Suppressor Proteins; DNA ligase; DNA methyltransferase; MGMT protein, human; tumor suppressor protein; central nervous system tumor; cross-sectional study; DNA methylation; female; genetics; glioma; human; immunohistochemistry; Indonesia; male; middle aged; polymerase chain reaction; predictive value; reproducibility; sensitivity and specificity
Subjects: R Medicine > RB Biomedical Sciences
Divisions: Faculty of Medicine, Public Health and Nursing > Public Health and Nutrition
Depositing User: Sri JUNANDI
Date Deposited: 20 Sep 2024 06:30
Last Modified: 20 Sep 2024 06:30
URI: https://ir.lib.ugm.ac.id/id/eprint/4800

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