scholarly journals Association Between MGMT Promoter Methylation and Breast Cancer: a Meta-Analysis

2017 ◽  
Vol 42 (6) ◽  
pp. 2430-2440 ◽  
Author(s):  
Nairui An ◽  
Yu Shi ◽  
Peng Ye ◽  
Zhongya Pan ◽  
Xinghua Long
Keyword(s):  
Breast Cancer ◽  
Promoter Methylation ◽  
Dna Methyltransferase ◽  
Histological Grade ◽  
Meta Analysis ◽  
Methylation Status ◽  
Mgmt Promoter Methylation ◽  
P Value ◽  
Breast Cancer Patients ◽  
Mgmt Promoter

Background/Aims: Numerous studies have suggested that the promoter methylation status of O6-methylguanine-DNA methyltransferase (MGMT) is significantly associated with breast cancer. However, these studies have not demonstrated consistent results. Methods: To obtain more accurate results for this possible association, we performed a meta-analysis-based study using the relevant data. A total of 14 articles were included in this meta-analysis. Results: Our study showed that the frequency of MGMT promoter methylation was significantly higher in patients with breast cancer than non-breast cancer subjects with an Odds Ratio (OR) of 4.47, a 95% Confidence Interval (CI) ranging between 1.95 - 10.25 and a P value of 0.0004. Moreover, MGMT methylation was significantly associated with the negative expression of the MGMT protein (OR = 4.65, 95%CI = 2.66 - 8.12, P < 0.00001), Oestrogen Receptor (ER)-negative tumours (OR = 1.79, 95%CI = 1.09 - 2.93, P = 0.02), postmenopausal status (OR =1.84, 95%CI = 1.18 - 2.87, P = 0.007) and histological grade III tumours (OR = 2.49, 95%CI = 1.53 - 4.07, P = 0.0003) in breast cancer patients. However, breast cancer was not significantly correlated with lymph node metastasis (OR = 1.19, 95%CI = 0.83 - 1.70, P = 0.35), Progesterone Receptor (PR) status (OR = 1.08, 95%CI = 0.58 - 2.00, P = 0.81), Human epidermal growth factor receptor - 2（HER-2/neu）status (OR = 1.01, 95%CI = 0.65 - 1.57, P = 0.97), P53 mutation (OR = 1.30, 95%CI = 0.76 - 2.21, P = 0.34) and age > 50 (OR = 1.07, 95%CI = 0.46 - 2.51, P = 0.88). Conclusions: Our study suggests that MGMT promoter methylation may be an early biomarker for the diagnosis of breast cancer.

Clinical Significance of O-6-Methylguanine-DNA-Methyltransferase Promoter Methylation in Patients with Esophageal Carcinoma: A Systematic Meta-Analysis

2017 ◽  
Vol 36 (2) ◽  
pp. 89-97 ◽  
Author(s):  
Yan Zhang ◽  
Ti Tong
Keyword(s):  
Esophageal Carcinoma ◽  
Promoter Methylation ◽  
Dna Methyltransferase ◽  
Meta Analysis ◽  
Clinical Stage ◽  
Mgmt Promoter Methylation ◽  
Lymph Node Status ◽  
Tissue Samples ◽  
Methylguanine Dna Methyltransferase ◽  
Mgmt Promoter

Background: The correlation between O-6-methylguanine-DNA-methyltransferase (MGMT) promoter methylation and esophageal cancer remains controversial. This study was conducted to evaluate the clinical effect of MGMT promoter methylation on esophageal carcinoma patients. Methods: A literature search was conducted in the PubMed, EMBASE, EBSCO, and Cochrane Library databases. The overall OR and corresponding 95% CI were calculated using the random-effects model. Results: Finally, 17 eligible studies were identified in this meta-analysis; these studies included a total of 1,368 patients with esophageal carcinoma and 1,489 with nonmalignant controls. MGMT promoter methylation was significantly higher in esophageal carcinoma tissue samples than in nonmalignant tissue samples (OR 3.64, p < 0.001). Promoter methylation of the MGMT gene was not associated with gender, cigarette smoking, drinking behavior, or tumor differentiation, but MGMT promoter methylation was correlated with age (≥60 vs. <60 years: OR 1.64, p = 0.028), lymph node status (positive status vs. negative status: OR 2.39, p = 0.024), and clinical stage (stages 3-4 vs. 1-2: OR 10.59, p < 0.001). Conclusions: Our findings suggest that MGMT promoter methylation may be correlated with esophageal cancer carcinogenesis and could be associated with age, lymph node status, and clinical stage.

scholarly journals Recycling drug screen repurposes hydroxyurea as a sensitizer of glioblastomas to temozolomide targeting de novo DNA synthesis, irrespective of molecular subtype

2017 ◽  
Vol 20 (5) ◽  
pp. 642-654 ◽  
Author(s):  
Jian Teng ◽  
Seyedali Hejazi ◽  
Lotte Hiddingh ◽  
Litia Carvalho ◽  
Mark C de Gooijer ◽  
...  
Keyword(s):  
Promoter Methylation ◽  
Dna Methyltransferase ◽  
Methylation Status ◽  
Primary Cultures ◽  
Mgmt Promoter Methylation ◽  
In Vivo Models ◽  
Promoter Methylation Status ◽  
Mgmt Promoter ◽  
Mgmt Promoter Methylation Status

Abstract Background Glioblastoma (GBM) is the most common and most aggressive primary malignant brain tumor. Standard-of-care treatment involves maximal surgical resection of the tumor followed by radiation and chemotherapy (temozolomide [TMZ]). The 5-year survival rate of patients with GBM is &lt;10%, a colossal failure that has been partially attributed to intrinsic and/or acquired resistance to TMZ through O6-methylguanine DNA methyltransferase (MGMT) promoter methylation status in the tumor. Methods A drug screening aimed at evaluating the potential recycling and repurposing of known drugs was conducted in TMZ-resistant GBM cell lines and primary cultures of newly diagnosed GBM with different MGMT promoter methylation status, phenotypic/genotypic background and subtype, and validated with sphere formation, cell migration assays, and quantitative invasive orthotopic in vivo models. Results We identified hydroxyurea (HU) to synergize with TMZ in GBM cells in culture and in vivo, irrespective of MGMT promoter methylation status, subtype, and/or stemness. HU acts specifically on the S-phase of the cell cycle by inhibiting the M2 unit of enzyme ribonucleotide reductase. Knockdown of this enzyme using RNA interference and other known chemical inhibitors exerted a similar effect to HU in combination with TMZ both in culture and in vivo. Conclusions We demonstrate preclinical efficacy of repurposing hydroxyurea in combination with TMZ for adjuvant GBM therapy. This combination benefit is of direct clinical interest given the extensive use of TMZ and the associated problems with TMZ-related resistance and treatment failure.

scholarly journals Tim-3 protein expression with MGMT methylation status in glioblastoma and association with survival

2020 ◽  
Author(s):  
ji zhang ◽  
Xiaoli Wang ◽  
Shengquan Ye ◽  
Lijiao Liang ◽  
Yi Zhou ◽  
...  
Keyword(s):  
Protein Expression ◽  
Promoter Methylation ◽  
Immune Checkpoint ◽  
Dna Methyltransferase ◽  
Methylation Status ◽  
Prognostic Significance ◽  
Mgmt Promoter Methylation ◽  
Mgmt Methylation ◽  
Methylguanine Dna Methyltransferase ◽  
Mgmt Promoter

Abstract Background Understanding the molecular landscape of glioblastoma (GBM) is increasingly crucial for its therapy. Immune checkpoint molecules motivated the emergence of immune checkpoint-targeting therapeutic strategies. However, the prognostic significance of the immune checkpoint molecule T cell immunoglobulin mucin-3 (Tim-3) on tumor-infiltrating immune cells (TIICs) and O-6-Methylguanine-DNA methyltransferase (MGMT) methylation status remains to be fully elucidated. We aimed to develop an MGMT methylation status-associated immune prognostic signature for predicting prognosis in GBMs.Patients and Methods: A total of 84 patients with newly diagnosed GBM were involved. MGMT methylation status was retrospectively analyzed and the expression level of Tim-3 protein was investigated using immunohistochemistry (IHC). The correlation between Tim-3 protein expression and MGMT methylation status, and the prognosis was explored.Results The obtained data showed that Tim-3 protein was expressed at different levels in GBMs. Mesenchymal expression of Tim-3 protein in these tissues was 73.81% (62/84), including low 15.48% (13/84), moderate 7.14% (6/84) and strong expression 51.19% (43/84), respectively. Of the 48 patients whose tumors tested positive for MGMT methylation, the remaining 36 patients was negative.Conclusions We profiled the immune status in GBM with MGMT promoter methylation and established a local immune signature for GBM, which could independently identify patients with a favorable prognosis, indicating the relationship between prognosis and immune. MGMT promoter methylation with lower Tim-3 protein expression was statistically significantly associated with better survival.

Correlation of the quantitative level of MGMT promoter methylation and overall survival in primary diagnosed glioblastomas using the quantitative MethyQESD method

2019 ◽  
Vol 73 (2) ◽  
pp. 112-115 ◽  
Author(s):  
Charlotte von Rosenstiel ◽  
Benedikt Wiestler ◽  
Bernhard Haller ◽  
Friederike Schmidt-Graf ◽  
Jens Gempt ◽  
...  
Keyword(s):  
Overall Survival ◽  
Promoter Methylation ◽  
Promoter Region ◽  
Dna Methyltransferase ◽  
Methylation Status ◽  
Mgmt Promoter Methylation ◽  
Newly Diagnosed ◽  
Quantitative Level ◽  
Mgmt Promoter ◽  
The Impact

AimsO(6)-methylguanine-DNA-methyltransferase (MGMT) promoter methylation is a high predictive factor for therapy results of temozolomide in patients with glioma. The objective of this work was to analyse the impact of MGMT promoter methylation in patients with primary diagnosed glioblastoma (GBM) relating to survival using a quantitative method (methylation quantification of endonuclease-resistant DNA, MethyQESD) by verifying a cut-off point for MGMT methylation provided by the literature (</≥10%) and calculating an optimal cut-off.Methods67 patients aged 70 years or younger, operated between January 2013 and December 2015, with newly diagnosed IDH wild-type GBM and clinical follow-up were retrospectively investigated in this study. A known MGMT promoter methylation status was the inclusion criteria.ResultsMedian overall survival (OS) was 16.9 months. Patients who had a methylated MGMT promoter region of ≥10% had an improved OS compared with patients with a methylated promoter region of <10% (p=0.002). Optimal cut-off point for MGMT promoter methylation was 11.7% (p=0.012).ConclusionThe results confirm that the quantitative level of MGMT promoter methylation is a positive prognostic factor in newly diagnosed patients with GBM. The cut-off provided by the literature (</≥10%) and the calculated optimal cut-off value of 11.7% give a statistically significant separation. Hence, MethyQESD is a reliable method to calculate MGMT promoter methylation in GBM.

O6-methylguanine-DNA methyltransferase (MGMT) promoter methylation and relation to 1p/19q loss in low grade gliomas: A GICNO study

2006 ◽  
Vol 24 (18_suppl) ◽  
pp. 20064-20064 ◽  
Author(s):  
L. Nicolardi ◽  
R. Bertorelle ◽  
L. Bonaldi ◽  
A. Compostella ◽  
A. Roma ◽  
...  
Keyword(s):  
Promoter Methylation ◽  
Dna Methyltransferase ◽  
Alkylating Agents ◽  
Methylation Status ◽  
Mgmt Promoter Methylation ◽  
Low Grade ◽  
Tumor Localization ◽  
Response To Chemotherapy ◽  
Mgmt Promoter ◽  
The Impact

20064 Background: 1p and 19q deletions have been associated with a favorable response to chemotherapy and a good prognosis in patients (pts) with oligodendroglioma. MGMT promoter methylation has been associated with a longer survival in pts with glioblastoma who receive alkylating agents. As yet, there are no data on the expression of MGMT, and on the relationship between 1p/19q deletions and MGMT promoter methylation in low grade glioma (LGG). Methods: Pts that received a first line chemotherapy regimen with temozolomide for progressive LGG were enrolled in the study, designed to investigate the correlation between MGMT methylation status and 1p/19q deletions in this setting. 1p/19q deletions were analysed by FISH, and MGMT promoter methylation by methylation specific PCR (MSP). Results: Seventy-five pts (26 females, 49 males; median age 42 years: range 22–68 years) were accrued. Of these, 48 (64%) had oligodendrogliomas (O), 19 (25.3%) astrocytomas (A), and 8 (10.6%) oligoastrocytomas (OA); 44 (58.7%) had a history of epilepsy, 41 (54.7%) had a frontal tumor localization, 27 (36%) had MRI contrast enhancing lesions, and 35 (46.7%) had been pre-treated with radiotherapy. 1p/19q deletions, evaluable in 58 pts (77.3%), were both present in 36 pts (62%), (3 being A and 2 OA); 18 pts (31%) had no loss; 1 pt (1.7%) had 1p loss; 3 pts (5.2%) 19q loss. Combined 1p and 19q loss was not correlated with a frontal localization (p = 0.12), median age (0.47) and/or gender (0.62). MGMT promoter methylation, present in 17 (56.6%) of 30 assessable cases, was significantly associated with combined 1p/19q deletions (p = 0.03). MGMT promoter methylation was not significantly associated with age (p = 0.46), gender (p = 0.2), tumor localization (p = 0.12) and/or histology (0.37). Conclusions: 1p/19q deletions are strictly correlated to histology and to MGMT promoter methylation; further prospective trials are required to clarify the impact of these molecular signatures on clinical outcome. No significant financial relationships to disclose.

5-day dosing schedule of temozolomide in relapsed sensitive or refractory small cell lung cancer (SCLC) and methyl-guanine-DNA methyltransferase (MGMT) analysis in a phase II trial.

2012 ◽  
Vol 30 (15_suppl) ◽  
pp. 7052-7052
Author(s):  
Alexander Edward Dela Cruz Drilon ◽  
Kadota Kyuichi ◽  
Kety H Huberman ◽  
Camelia S. Sima ◽  
John Joseph Fiore ◽  
...  
Keyword(s):  
Promoter Methylation ◽  
Dna Methyltransferase ◽  
Response Rate ◽  
Alkylating Agents ◽  
Parp Inhibitor ◽  
Methylation Status ◽  
Mgmt Promoter Methylation ◽  
Dosing Schedule ◽  
Mgmt Expression ◽  
Mgmt Promoter

7052 Background: MGMT promoter methylation and loss of MGMT activity are associated with improved sensitivity to alkylating agents. We recently reported that the oral alkylating agent temozolomide is active in 2nd- and 3rd-line treatment of relapsed SCLC at 75mg/m2/day for 21 out of 28 days (Pietanza et al, Clin Can Res 2012). Here we evaluate the 5-day dosing schedule of temozolomide in a second cohort of patients and analyze MGMT activity in both cohorts of patients on the same study. Methods: Patients with disease progression after 1 or 2 prior chemotherapy regimens received temozolomide at 200mg/m2/day for 5 out of 28 days (n=25). Those with sensitive (S-SCLC, n=16) and refractory (R-SCLC, n=9) disease were enrolled to assess safety. Available tumor tissue from patients treated according to either schedule was assessed for MGMT promoter methylation status by PCR and MGMT expression by immunohistochemistry (IHC). Results: An overall response rate of 12% was noted (3 partial responses: 1 S-SCLC, 2 R-SCLC). 4 patients had stable disease for at least 3 cycles. Median progression-free survival and overall survival for all patients were 1.3 months and 7.9 months, respectively. Grade ≥3 thrombocytopenia and neutropenia was observed in 20% with a shorter mean duration of myelosuppression compared to the 21-day schedule. Results from MGMT evaluation of tumor samples from both dosing schedules were combined. Promoter methylation of MGMT was not significantly associated with response (p=0.23). However, patients that lacked MGMT expression by IHC had a higher response rate compared to those with MGMT-positive tumors (43% vs. 13%, p = 0.052; see table). Conclusions: The 5-day dosing schedule of temozolomide is both active and safe in patients with relapsed SCLC. A strong trend toward increased response was demonstrated in patients with MGMT-negative tumors compared to patients with MGMT-positive tumors by IHC. A trial combining temozolomide with the PARP inhibitor, ABT888, is planned. [Table: see text]

scholarly journals XGBoost Improves Classification of MGMT Promoter Methylation Status in IDH1 Wildtype Glioblastoma

2020 ◽  
Vol 10 (3) ◽  
pp. 128 ◽  
Author(s):  
Nguyen Quoc Khanh Le ◽  
Duyen Thi Do ◽  
Fang-Ying Chiu ◽  
Edward Kien Yee Yapp ◽  
Hui-Yuan Yeh ◽  
...  
Keyword(s):  
Promoter Methylation ◽  
Dna Methyltransferase ◽  
Methylation Status ◽  
Mgmt Promoter Methylation ◽  
Gradient Boosting ◽  
Mgmt Methylation ◽  
Promoter Methylation Status ◽  
Extreme Gradient Boosting ◽  
Mgmt Promoter ◽  
Mgmt Promoter Methylation Status

Approximately 96% of patients with glioblastomas (GBM) have IDH1 wildtype GBMs, characterized by extremely poor prognosis, partly due to resistance to standard temozolomide treatment. O6-Methylguanine-DNA methyltransferase (MGMT) promoter methylation status is a crucial prognostic biomarker for alkylating chemotherapy resistance in patients with GBM. However, MGMT methylation status identification methods, where the tumor tissue is often undersampled, are time consuming and expensive. Currently, presurgical noninvasive imaging methods are used to identify biomarkers to predict MGMT methylation status. We evaluated a novel radiomics-based eXtreme Gradient Boosting (XGBoost) model to identify MGMT promoter methylation status in patients with IDH1 wildtype GBM. This retrospective study enrolled 53 patients with pathologically proven GBM and tested MGMT methylation and IDH1 status. Radiomics features were extracted from multimodality MRI and tested by F-score analysis to identify important features to improve our model. We identified nine radiomics features that reached an area under the curve of 0.896, which outperformed other classifiers reported previously. These features could be important biomarkers for identifying MGMT methylation status in IDH1 wildtype GBM. The combination of radiomics feature extraction and F-core feature selection significantly improved the performance of the XGBoost model, which may have implications for patient stratification and therapeutic strategy in GBM.

scholarly journals P14.108 Bevacizumab versus alkylating chemotherapy in recurrent glioblastoma

2019 ◽  
Vol 21 (Supplement_3) ◽  
pp. iii93-iii94
Author(s):  
K Seystahl ◽  
B Hentschel ◽  
S Loew ◽  
D Gramatzki ◽  
J Felsberg ◽  
...  
Keyword(s):  
Promoter Methylation ◽  
Dna Methyltransferase ◽  
Alkylating Agent ◽  
Alkylating Agents ◽  
Methylation Status ◽  
Recurrent Glioblastoma ◽  
Mgmt Promoter Methylation ◽  
University Hospital ◽  
Mgmt Promoter ◽  
First Recurrence

Abstract BACKGROUND The use of alkylating chemotherapy versus bevacizumab for recurrent glioblastoma remains controversial. Here we tested the hypothesis that the activity of alkylators, but not that of bevacizumab, would be associated with the O6-methylguanine DNA methyltransferase (MGMT) promoter methylation status PATIENTS AND METHODS We analyzed a cohort of patients treated at centers of the German Glioma Network or the University Hospital Zurich with alkylating agent-based chemotherapy (n=260) or bevacizumab without or with irinotecan (n=84) for first recurrence of glioblastoma. Outcome was stratified for MGMT status and cross-over to bevacizumab or alkylators at further tumor progression. RESULTS Median post-recurrence survival-1 (PRS-1) for patients receiving alkylating agent chemotherapy at first recurrence was longer than for patients receiving bevacizumab (11.1 versus 7.4 months, p<0.001). The use of alkylating agents was associated with longer PRS-1 for patients with a methylated versus an unmethylated MGMT promoter (p=0.017). For patients receiving bevacizumab, PRS-1 was not different with or without MGMT promoter methylation. PRS-1 was longer in the group receiving alkylating chemotherapy compared to bevacizumab for patients with a methylated (p<0.001) or unmethylated MGMT promoter (p=0.034). For patients with alkylators at first recurrence receiving bevacizumab at any further recurrence, PRS-1 was longer than in patients receiving bevacizumab first and alkylators thereafter (p=0.002). CONCLUSION This study confirms limited value of bevacizumab in recurrent glioblastoma independent of MGMT status. Alkylating agents have activity in recurrent glioblastoma, especially in the context of a methylated MGMT promoter.

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