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Yang ZC, Yin CD, Yeh FC, Xue BW, Song XY, Li G, Sun SJ, Deng ZH, Hou ZG, Xie J. Exploring MGMT methylation-driven structural connectivity changes in insular gliomas: a tractography and graph theoretical analysis. J Neurooncol 2024; 166:155-165. [PMID: 38150062 DOI: 10.1007/s11060-023-04539-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 12/11/2023] [Indexed: 12/28/2023]
Abstract
OBJECTIVES This study aims to explore the relationship between the methylation levels of the O-6-methylguanine-DNA methyltransferase (MGMT) promoter and the structural connectivity in insular gliomas across hemispheres. METHODS We analyzed 32 left and 29 right insular glioma cases and 50 healthy controls, using differential tractography, correlational tractography, and graph theoretical analysis to investigate the correlation between structural connectivity and the methylation level. RESULTS The differential tractography results revealed that in left insular glioma, the volume of affected inferior fronto-occipital fasciculus (IFOF, p = 0.019) significantly correlated with methylation levels. Correlational tractography results showed that the quantitative anisotropy (QA) value of peritumoral fiber tracts also exhibited a significant correlation with methylation levels (FDR < 0.05). On the other hand, in right insular glioma, anterior internal part of the reticular tract, IFOF, and thalamic radiation showed a significant correlation with methylation levels but at a different correlation direction from the left side (FDR < 0.05). The graph theoretical analysis showed that in the left insular gliomas, only the radius of graph was significantly lower in methylated MGMT group than unmethylated group (p = 0.047). No significant correlations between global properties and methylation levels were observed in insular gliomas on both sides. CONCLUSION Our findings highlight a significant, hemisphere-specific correlation between MGMT promoter methylation and structural connectivity in insular gliomas. This study provides new insights into the genetic influence on glioma pathology, which could inform targeted therapeutic strategies.
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Affiliation(s)
- Zuo-Cheng Yang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, No.119 of South 4th Ring Road, Fengtai District, Beijing, China
| | - Chuan-Dong Yin
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, No.119 of South 4th Ring Road, Fengtai District, Beijing, China
| | - Fang-Cheng Yeh
- Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
| | - Bo-Wen Xue
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, No.119 of South 4th Ring Road, Fengtai District, Beijing, China
| | - Xin-Yu Song
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, No.119 of South 4th Ring Road, Fengtai District, Beijing, China
| | - Gen Li
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, No.119 of South 4th Ring Road, Fengtai District, Beijing, China
| | - Sheng-Jun Sun
- Neuroimaging Center, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Zheng-Hai Deng
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, No.119 of South 4th Ring Road, Fengtai District, Beijing, China
| | - Zong-Gang Hou
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, No.119 of South 4th Ring Road, Fengtai District, Beijing, China.
| | - Jian Xie
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, No.119 of South 4th Ring Road, Fengtai District, Beijing, China.
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Tang Y, Gutmann DH. Neurofibromatosis Type 1-Associated Optic Pathway Gliomas: Current Challenges and Future Prospects. Cancer Manag Res 2023; 15:667-681. [PMID: 37465080 PMCID: PMC10351533 DOI: 10.2147/cmar.s362678] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 06/06/2023] [Indexed: 07/20/2023] Open
Abstract
Optic pathway glioma (OPG) occurs in as many as one-fifth of individuals with the neurofibromatosis type 1 (NF1) cancer predisposition syndrome. Generally considered low-grade and slow growing, many children with NF1-OPGs remain asymptomatic. However, due to their location within the optic pathway, ~20-30% of those harboring NF1-OPGs will experience symptoms, including progressive vision loss, proptosis, diplopia, and precocious puberty. While treatment with conventional chemotherapy is largely effective at attenuating tumor growth, it is not clear whether there is much long-term recovery of visual function. Additionally, because these tumors predominantly affect young children, there are unique challenges to NF1-OPG diagnosis, monitoring, and longitudinal management. Over the past two decades, the employment of authenticated genetically engineered Nf1-OPG mouse models have provided key insights into the function of the NF1 protein, neurofibromin, as well as the molecular and cellular pathways that contribute to optic gliomagenesis. Findings from these studies have resulted in the identification of new molecular targets whose inhibition blocks murine Nf1-OPG growth in preclinical studies. Some of these promising compounds have now entered into early clinical trials. Future research focused on defining the determinants that underlie optic glioma initiation, expansion, and tumor-induced optic nerve injury will pave the way to personalized risk assessment strategies, improved tumor monitoring, and optimized treatment plans for children with NF1-OPG.
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Affiliation(s)
- Yunshuo Tang
- Department of Ophthalmology, Washington University School of Medicine, St. Louis, MO, USA
- Department of Neurology, Washington University School of Medicine, St. Louis, MO, USA
| | - David H Gutmann
- Department of Neurology, Washington University School of Medicine, St. Louis, MO, USA
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