Brain regions associated with telomerase reverse transcriptase promoter mutations in primary glioblastomas.

Abstract

Human telomerase reverse transcriptase (TERT) promoter mutations are important genetic alterations in many kinds of human malignancies, including glioma. The current study aimed to investigate the anatomical specificity of TERT promoter mutations in glioblastomas (GBMs). Clinical information and preoperative magnetic resonance images of 203 patients with GBMs were reviewed. TERT promoter mutation status was assessed by Sanger sequencing in all cases. Tumor lesions were manually segmented and then registered to a standard brain atlas. Then the specific brain regions associated with TERT promoter mutation status were subsequently identified by voxel-based regression analysis. TERT promoter mutations were detected in 94 (46.3%) of the 203 patients. Voxel-based statistical analysis demonstrated that GBMs with TERT promoter mutations were much more likely to locate in the right temporal lobe, while those with wild-type TERT promoters were more likely to occur in the anterior region of the right lateral ventricle. No significant difference was found in the lesion volumes of the T2-identified tumor or in the contrast enhancement areas between the two groups. The current study demonstrated the anatomic specificity of TERT promoter mutation status in GBM. These findings may provide new insight into the molecular classification of GBM and further our understanding of the associations between tumor-specific molecular alterations and tumor location.