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Satgunaseelan L, Lee M, Iannuzzi S, Hallal S, Deang K, Stanceski K, Wei H, Mason S, Shivalingam B, Sim HW, Buckland ME, Alexander KL. 'The Reports of My Death Are Greatly Exaggerated'-Evaluating the Effect of Necrosis on MGMT Promoter Methylation Testing in High-Grade Glioma. Cancers (Basel) 2024; 16:1906. [PMID: 38791984 PMCID: PMC11120496 DOI: 10.3390/cancers16101906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 05/09/2024] [Accepted: 05/14/2024] [Indexed: 05/26/2024] Open
Abstract
(1) Background: MGMT (O-6-methylguanine-DNA methyltransferase) promoter methylation remains an important predictive biomarker in high-grade gliomas (HGGs). The influence of necrosis on the fidelity of MGMT promoter (MGMTp) hypermethylation testing is currently unknown. Therefore, our study aims to evaluate the effect of varying degrees of necrosis on MGMTp status, as determined by pyrosequencing, in a series of primary and recurrent HGGs; (2) Methods: Within each case, the most viable blocks (assigned as 'true' MGMTp status) and the most necrotic block were determined by histopathology review. MGMTp status was determined by pyrosequencing. Comparisons of MGMTp status were made between the most viable and most necrotic blocks. (3) Results: 163 samples from 64 patients with HGGs were analyzed. MGMTp status was maintained in 84.6% of primary and 78.3% of recurrent HGGs between the most viable and necrotic blocks. A threshold of ≥60% tumor cellularity was established at which MGMTp status was unaltered, irrespective of the degree of necrosis. (4) Conclusions: MGMTp methylation status, as determined by pyrosequencing, does not appear to be influenced by necrosis in the majority of cases at a cellularity of at least 60%. Further investigation into the role of intratumoral heterogeneity on MGMTp status will increase our understanding of this predictive marker.
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Affiliation(s)
- Laveniya Satgunaseelan
- Department of Neuropathology, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia; (M.L.); (S.I.); (S.H.); (K.S.); (H.W.); (M.E.B.); (K.L.A.)
- Faculty of Medicine and Health, School of Medicine, University of Sydney, Camperdown Campus, Sydney, NSW 2000, Australia; (K.D.); (B.S.)
| | - Maggie Lee
- Department of Neuropathology, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia; (M.L.); (S.I.); (S.H.); (K.S.); (H.W.); (M.E.B.); (K.L.A.)
- Faculty of Medicine and Health, School of Medicine, University of Sydney, Camperdown Campus, Sydney, NSW 2000, Australia; (K.D.); (B.S.)
| | - Sebastian Iannuzzi
- Department of Neuropathology, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia; (M.L.); (S.I.); (S.H.); (K.S.); (H.W.); (M.E.B.); (K.L.A.)
- Faculty of Medicine and Health, School of Medicine, University of Sydney, Camperdown Campus, Sydney, NSW 2000, Australia; (K.D.); (B.S.)
| | - Susannah Hallal
- Department of Neuropathology, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia; (M.L.); (S.I.); (S.H.); (K.S.); (H.W.); (M.E.B.); (K.L.A.)
- Faculty of Medicine and Health, School of Medicine, University of Sydney, Camperdown Campus, Sydney, NSW 2000, Australia; (K.D.); (B.S.)
- Department of Neurosurgery, Chris O’Brien Lifehouse, Camperdown, NSW 2050, Australia
| | - Kristine Deang
- Faculty of Medicine and Health, School of Medicine, University of Sydney, Camperdown Campus, Sydney, NSW 2000, Australia; (K.D.); (B.S.)
- Department of Neurosurgery, Chris O’Brien Lifehouse, Camperdown, NSW 2050, Australia
| | - Kristian Stanceski
- Department of Neuropathology, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia; (M.L.); (S.I.); (S.H.); (K.S.); (H.W.); (M.E.B.); (K.L.A.)
- Faculty of Medicine and Health, School of Medicine, University of Sydney, Camperdown Campus, Sydney, NSW 2000, Australia; (K.D.); (B.S.)
| | - Heng Wei
- Department of Neuropathology, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia; (M.L.); (S.I.); (S.H.); (K.S.); (H.W.); (M.E.B.); (K.L.A.)
- Faculty of Medicine and Health, School of Medicine, University of Sydney, Camperdown Campus, Sydney, NSW 2000, Australia; (K.D.); (B.S.)
| | - Sofia Mason
- Department of Medical Oncology, Chris O’Brien Lifehouse, Camperdown, NSW 2050, Australia; (S.M.); (H.-W.S.)
- Garvan Institute of Medical Research, Darlinghurst, NSW 2010, Australia
- Faculty of Medicine and Health, University of New South Wales, Sydney, NSW 2052, Australia
| | - Brindha Shivalingam
- Faculty of Medicine and Health, School of Medicine, University of Sydney, Camperdown Campus, Sydney, NSW 2000, Australia; (K.D.); (B.S.)
- Department of Neurosurgery, Chris O’Brien Lifehouse, Camperdown, NSW 2050, Australia
- Department of Neurosurgery, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia
| | - Hao-Wen Sim
- Department of Medical Oncology, Chris O’Brien Lifehouse, Camperdown, NSW 2050, Australia; (S.M.); (H.-W.S.)
- Garvan Institute of Medical Research, Darlinghurst, NSW 2010, Australia
- Faculty of Medicine and Health, University of New South Wales, Sydney, NSW 2052, Australia
- NHMRC Clinical Trials Centre, University of Sydney, Camperdown, NSW 2050, Australia
- Department of Medical Oncology, The Kinghorn Cancer Centre, Darlinghurst, NSW 2010, Australia
| | - Michael E. Buckland
- Department of Neuropathology, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia; (M.L.); (S.I.); (S.H.); (K.S.); (H.W.); (M.E.B.); (K.L.A.)
- Faculty of Medicine and Health, School of Medicine, University of Sydney, Camperdown Campus, Sydney, NSW 2000, Australia; (K.D.); (B.S.)
| | - Kimberley L. Alexander
- Department of Neuropathology, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia; (M.L.); (S.I.); (S.H.); (K.S.); (H.W.); (M.E.B.); (K.L.A.)
- Faculty of Medicine and Health, School of Medicine, University of Sydney, Camperdown Campus, Sydney, NSW 2000, Australia; (K.D.); (B.S.)
- Department of Neurosurgery, Chris O’Brien Lifehouse, Camperdown, NSW 2050, Australia
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Matthaios D, Balgkouranidou I, Neanidis K, Sofis A, Pikouli A, Romanidis K, Pappa A, Karamouzis M, Zygogianni A, Charalampidis C, Zarogoulidis P, Rigas G, Galanis A. Revisiting Temozolomide's role in solid tumors: Old is gold? J Cancer 2024; 15:3254-3271. [PMID: 38817857 PMCID: PMC11134434 DOI: 10.7150/jca.94109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 03/23/2024] [Indexed: 06/01/2024] Open
Abstract
Temozolomide is an imidazotetrazine with a long history in oncology especially for the high grade malignant glioma and metastatic melanoma. However, last year's new indications for its use are added. Its optimum pharmacodynamic profile, its ability to penetrate the blood-brain barrier, the existence of methylation of MGMT in solid tumors which enhances its efficacy, the identification of new agents that can overcome temozolomide's resistance, the promising role of temozolomide in turning immune cold tumors to hot ones, are leading to expand its use in other solid tumors, giving oncologists an additional tool for the treatment of advanced and aggressive neoplasms.
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Affiliation(s)
| | | | | | | | - Anastasia Pikouli
- Third Department of Surgery, Attikon University Hospital, Athens, Greece
| | - Konstantinos Romanidis
- Second Department of Surgery, University General Hospital of Alexandroupolis, Democritus University of Thrace Medical School, Alexandroupolis, Greece
| | - Aglaia Pappa
- Department of Molecular Biology & Genetics, Democritus University of Thrace, Alexandroupolis, Greece
| | - Michael Karamouzis
- Molecular Oncology Unit, Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Anna Zygogianni
- Radiation Oncology Unit, 1st Department of Radiology, Aretaieion University Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | | | - Paul Zarogoulidis
- Pulmonary-Oncology Department, General Clinic Euromedice, Thessaloniki, Greece
| | - George Rigas
- Oncology Department, Private General Clinic of Volos, Volos, Greece
| | - Alex Galanis
- Department of Molecular Biology & Genetics, Democritus University of Thrace, Alexandroupolis, Greece
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Silva FFVE, Di Domenico M, Caponio VCA, Pérez-Sayáns M, Camolesi GCV, Rojo-Álvarez LI, Ballini A, García-García A, Padín-Iruegas ME, Suaréz-Peñaranda JM. Pyrosequencing Analysis of O-6-Methylguanine-DNA Methyltransferase Methylation at Different Cut-Offs of Positivity Associated with Treatment Response and Disease-Specific Survival in Isocitrate Dehydrogenase-Wildtype Grade 4 Glioblastoma. Int J Mol Sci 2024; 25:612. [PMID: 38203783 PMCID: PMC10779484 DOI: 10.3390/ijms25010612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 12/29/2023] [Accepted: 01/01/2024] [Indexed: 01/12/2024] Open
Abstract
The O-6-methylguanine-DNA methyltransferase (MGMT) gene is a critical guardian of genomic integrity. MGMT methylation in diffuse gliomas serves as an important determinant of patients' prognostic outcomes, more specifically in glioblastomas (GBMs). In GBMs, the absence of MGMT methylation, known as MGMT promoter unmethylation, often translates into a more challenging clinical scenario, tending to present resistance to chemotherapy and a worse prognosis. A pyrosequencing (PSQ) technique was used to analyze MGMT methylation status at different cut-offs (5%, 9%, and 11%) in a sample of 78 patients diagnosed with IDH-wildtype grade 4 GBM. A retrospective analysis was provided to collect clinicopathological and prognostic data. A statistical analysis was used to establish an association between methylation status and treatment response (TR) and disease-specific survival (DSS). The patients with methylated MGMT status experienced progressive disease rates of 84.6%, 80%, and 78.4% at the respective cut-offs of 5%, 9%, and 11%. The number was considerably higher when considering unmethylated patients, as all patients (100%), regardless of the cut-off, presented progressive disease. Regarding disease-specific survival (DSS), the Hazard Ratio (HR) was HR = 0.74 (0.45-1.24; p = 0.251); HR = 0.82 (0.51-1.33; p = 0.425); and HR = 0.79 (0.49-1.29; p = 0.350), respectively. Our study concludes that there is an association between MGMT unmethylation and worse TR and DSS. The 9% cut-off demonstrated a greater potential for patient survival as a function of time, which may shed light on the future need for standardization of MGMT methylation positivity parameters in PSQ.
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Affiliation(s)
- Fábio França Vieira e Silva
- Department of Medicine and Dentistry, University of Santiago de Compostela, San Francisco Street, s/n, 15782 Santiago de Compostela, Spain (M.P.-S.); (G.C.V.C.); (A.G.-G.); (J.M.S.-P.)
- Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela University Clinical Hospital, University of Santiago de Compostela, Choupana Street, s/n, 15706 Santiago de Compostela, Spain;
- Department of Precision Medicine, University of Campania Luigi Vanvitelli, Via Abramo Lincoln, 5, 81100 Caserta, Italy; (M.D.D.); (A.B.)
| | - Marina Di Domenico
- Department of Precision Medicine, University of Campania Luigi Vanvitelli, Via Abramo Lincoln, 5, 81100 Caserta, Italy; (M.D.D.); (A.B.)
| | - Vito Carlo Alberto Caponio
- Department of Clinical and Experimental Medicine, University of Foggia, Via Napoli, 20, 71122 Foggia, Italy;
| | - Mario Pérez-Sayáns
- Department of Medicine and Dentistry, University of Santiago de Compostela, San Francisco Street, s/n, 15782 Santiago de Compostela, Spain (M.P.-S.); (G.C.V.C.); (A.G.-G.); (J.M.S.-P.)
- Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela University Clinical Hospital, University of Santiago de Compostela, Choupana Street, s/n, 15706 Santiago de Compostela, Spain;
| | - Gisela Cristina Vianna Camolesi
- Department of Medicine and Dentistry, University of Santiago de Compostela, San Francisco Street, s/n, 15782 Santiago de Compostela, Spain (M.P.-S.); (G.C.V.C.); (A.G.-G.); (J.M.S.-P.)
| | - Laura Isabel Rojo-Álvarez
- Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela University Clinical Hospital, University of Santiago de Compostela, Choupana Street, s/n, 15706 Santiago de Compostela, Spain;
| | - Andrea Ballini
- Department of Precision Medicine, University of Campania Luigi Vanvitelli, Via Abramo Lincoln, 5, 81100 Caserta, Italy; (M.D.D.); (A.B.)
| | - Abel García-García
- Department of Medicine and Dentistry, University of Santiago de Compostela, San Francisco Street, s/n, 15782 Santiago de Compostela, Spain (M.P.-S.); (G.C.V.C.); (A.G.-G.); (J.M.S.-P.)
- Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela University Clinical Hospital, University of Santiago de Compostela, Choupana Street, s/n, 15706 Santiago de Compostela, Spain;
| | - María Elena Padín-Iruegas
- Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela University Clinical Hospital, University of Santiago de Compostela, Choupana Street, s/n, 15706 Santiago de Compostela, Spain;
- Human Anatomy and Embryology Area, Department of Functional Biology and Health Sciences, University of Vigo, Lagoas-Marcosende, s/n, 36310 Vigo, Spain
| | - Jose Manuel Suaréz-Peñaranda
- Department of Medicine and Dentistry, University of Santiago de Compostela, San Francisco Street, s/n, 15782 Santiago de Compostela, Spain (M.P.-S.); (G.C.V.C.); (A.G.-G.); (J.M.S.-P.)
- Health Research Institute of Santiago de Compostela (FIDIS), Santiago de Compostela University Clinical Hospital, University of Santiago de Compostela, Choupana Street, s/n, 15706 Santiago de Compostela, Spain;
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McCord M, Jamshidi P, Thirunavu V, Santana-Santos L, Vormittag-Nocito E, Dittman D, Parker S, Baczkowski J, Jennings L, Walshon J, McCortney K, Galbraith K, Zhang H, Lukas RV, Stupp R, Dixit K, Kumthekar P, Heimberger AB, Snuderl M, Horbinski C. Variant allelic frequencies of driver mutations can identify gliomas with potentially false-negative MGMT promoter methylation results. Acta Neuropathol Commun 2023; 11:175. [PMID: 37919784 PMCID: PMC10623846 DOI: 10.1186/s40478-023-01680-0] [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: 08/21/2023] [Accepted: 10/25/2023] [Indexed: 11/04/2023] Open
Abstract
MGMT promoter methylation testing is required for prognosis and predicting temozolomide response in gliomas. Accurate results depend on sufficient tumor cellularity, but histologic estimates of cellularity are subjective. We sought to determine whether driver mutation variant allelic frequency (VAF) could serve as a more objective metric for cellularity and identify possible false-negative MGMT samples. Among 691 adult-type diffuse gliomas, MGMT promoter methylation was assessed by pyrosequencing (N = 445) or DNA methylation array (N = 246); VAFs of TERT and IDH driver mutations were assessed by next generation sequencing. MGMT results were analyzed in relation to VAF. By pyrosequencing, 56% of all gliomas with driver mutation VAF ≥ 0.325 had MGMT promoter methylation, versus only 37% with VAF < 0.325 (p < 0.0001). The mean MGMT promoter pyrosequencing score was 19.3% for samples with VAF VAF ≥ 0.325, versus 12.7% for samples with VAF < 0.325 (p < 0.0001). Optimal VAF cutoffs differed among glioma subtypes (IDH wildtype glioblastoma: 0.12-0.18, IDH mutant astrocytoma: ~0.33, IDH mutant and 1p/19q co-deleted oligodendroglioma: 0.3-0.4). Methylation array was more sensitive for MGMT promoter methylation at lower VAFs than pyrosequencing. Microscopic examination tended to overestimate tumor cellularity when VAF was low. Re-testing low-VAF cases with methylation array and droplet digital PCR (ddPCR) confirmed that a subset of them had originally been false-negative. We conclude that driver mutation VAF is a useful quality assurance metric when evaluating MGMT promoter methylation tests, as it can help identify possible false-negative cases.
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Affiliation(s)
- Matthew McCord
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - Pouya Jamshidi
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - Vineeth Thirunavu
- Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - Lucas Santana-Santos
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - Erica Vormittag-Nocito
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - David Dittman
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - Stephanie Parker
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - Joseph Baczkowski
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - Lawrence Jennings
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - Jordain Walshon
- Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - Kathleen McCortney
- Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - Kristyn Galbraith
- Department of Pathology, New York University Langone Health, New York, USA
| | - Hui Zhang
- Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - Rimas V Lukas
- Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, USA
- Lou and Jean Malnati Brain Tumor Institute of the Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, USA
| | - Roger Stupp
- Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, USA
- Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, USA
- Lou and Jean Malnati Brain Tumor Institute of the Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, USA
| | - Karan Dixit
- Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, USA
- Lou and Jean Malnati Brain Tumor Institute of the Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, USA
| | - Priya Kumthekar
- Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, USA
- Lou and Jean Malnati Brain Tumor Institute of the Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, USA
| | - Amy B Heimberger
- Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, USA
- Lou and Jean Malnati Brain Tumor Institute of the Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, USA
| | - Matija Snuderl
- Department of Pathology, New York University Langone Health, New York, USA
| | - Craig Horbinski
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, USA.
- Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, USA.
- Lou and Jean Malnati Brain Tumor Institute of the Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, USA.
- Feinberg School of Medicine, Northwestern University, 303 E Superior Street, 6-518, Chicago, IL, 60611, USA.
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Penkova A, Kuziakova O, Gulaia V, Tiasto V, Goncharov NV, Lanskikh D, Zhmenia V, Baklanov I, Farniev V, Kumeiko V. Comprehensive clinical assays for molecular diagnostics of gliomas: the current state and future prospects. Front Mol Biosci 2023; 10:1216102. [PMID: 37908227 PMCID: PMC10613994 DOI: 10.3389/fmolb.2023.1216102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 09/04/2023] [Indexed: 11/02/2023] Open
Abstract
Glioma is one of the most intractable types of cancer, due to delayed diagnosis at advanced stages. The clinical symptoms of glioma are unclear and due to a variety of glioma subtypes, available low-invasive testing is not effective enough to be introduced into routine medical laboratory practice. Therefore, recent advances in the clinical diagnosis of glioma have focused on liquid biopsy approaches that utilize a wide range of techniques such as next-generation sequencing (NGS), droplet-digital polymerase chain reaction (ddPCR), and quantitative PCR (qPCR). Among all techniques, NGS is the most advantageous diagnostic method. Despite the rapid cheapening of NGS experiments, the cost of such diagnostics remains high. Moreover, high-throughput diagnostics are not appropriate for molecular profiling of gliomas since patients with gliomas exhibit only a few diagnostic markers. In this review, we highlighted all available assays for glioma diagnosing for main pathogenic glioma DNA sequence alterations. In the present study, we reviewed the possibility of integrating routine molecular methods into the diagnosis of gliomas. We state that the development of an affordable assay covering all glioma genetic aberrations could enable early detection and improve patient outcomes. Moreover, the development of such molecular diagnostic kits could potentially be a good alternative to expensive NGS-based approaches.
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Affiliation(s)
- Alina Penkova
- Institute of Life Sciences and Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Olga Kuziakova
- Institute of Life Sciences and Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Valeriia Gulaia
- Institute of Life Sciences and Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Vladlena Tiasto
- Institute of Life Sciences and Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Nikolay V. Goncharov
- Institute of Life Sciences and Biomedicine, Far Eastern Federal University, Vladivostok, Russia
- A. V. Zhirmunsky National Scientific Center of Marine Biology, FEB RAS, Vladivostok, Russia
| | - Daria Lanskikh
- Institute of Life Sciences and Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Valeriia Zhmenia
- Institute of Life Sciences and Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Ivan Baklanov
- Institute of Life Sciences and Biomedicine, Far Eastern Federal University, Vladivostok, Russia
- A. V. Zhirmunsky National Scientific Center of Marine Biology, FEB RAS, Vladivostok, Russia
| | - Vladislav Farniev
- Institute of Life Sciences and Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Vadim Kumeiko
- Institute of Life Sciences and Biomedicine, Far Eastern Federal University, Vladivostok, Russia
- A. V. Zhirmunsky National Scientific Center of Marine Biology, FEB RAS, Vladivostok, Russia
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Volumetric Analysis of Glioblastoma for Determining Which CpG Sites Should Be Tested by Pyrosequencing to Predict Temozolomide Efficacy. Biomolecules 2022; 12:biom12101379. [DOI: 10.3390/biom12101379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Revised: 09/18/2022] [Accepted: 09/24/2022] [Indexed: 11/16/2022] Open
Abstract
The aim of the present study was to determine which individual or combined CpG sites among O6-methylguanine DNA methyltransferase CpG 74–89 in glioblastoma mainly affects the response to temozolomide resulting from CpG methylation using statistical analyses focused on the tumor volume ratio (TVR). We retrospectively examined 44 patients who had postoperative volumetrically measurable residual tumor tissue and received adjuvant temozolomide therapy for at least 6 months after initial chemoradiotherapy. TVR was defined as the tumor volume 6 months after the initial chemoradiotherapy divided by that before the start of chemoradiotherapy. Predictive values for TVR as a response to adjuvant therapy were compared among the averaged methylation percentages of individual or combined CpGs using the receiver operating characteristic curve. Our data revealed that combined CpG 78 and 79 showed a high area under the curve (AUC) and a positive likelihood ratio and that combined CpG 76–79 showed the highest AUC among all combinations. AUCs of consecutive CpG combinations tended to be higher for CpG 74–82 in exon 1 than for CpG 83–89 in intron 1. In conclusion, the methylation status at CpG sites in exon 1 was strongly associated with TVR reduction in glioblastoma.
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