keyword
MENU ▼
Read by QxMD icon Read
search

MGMT

keyword
https://www.readbyqxmd.com/read/29350455/a-novel-prognostic-six-cpg-signature-in-glioblastomas
#1
An-An Yin, Nan Lu, Amandine Etcheverry, Marc Aubry, Jill Barnholtz-Sloan, Lu-Hua Zhang, Jean Mosser, Wei Zhang, Xiang Zhang, Yu-He Liu, Ya-Long He
AIMS: We aimed to identify a clinically useful biomarker using DNA methylation-based information to optimize individual treatment of patients with glioblastoma (GBM). METHODS: A six-CpG panel was identified by incorporating genome-wide DNA methylation data and clinical information of three distinct discovery sets and was combined using a risk-score model. Different validation sets of GBMs and lower-grade gliomas and different statistical methods were implemented for prognostic evaluation...
January 19, 2018: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29344904/mgmt-assessment-in-pituitary-adenomas-comparison-of-different-immunohistochemistry-fixation-chemicals
#2
Alexander S G Micko, Romana Höftberger, Adelheid Wöhrer, Matthias Millesi, Engelbert Knosp, Stefan Wolfsberger
PURPOSE: Despite the established role of O6-methyl-guanine-DNA methyltransferase (MGMT) as a marker for temozolomide response, consensus of the most reliable method to assess MGMT expression in pituitary adenomas is still missing. Currently, immunohistochemistry (IHC) assessment of formaldehyde fixed tissue samples is most widely used in a semiquantitative description. As formaldehyde fails to completely preserve nucleic acids, RCL2, an alcohol-based formaldehyde-free fixative, has been proposed as a more reliable alternative in terms of cell stability...
January 17, 2018: Pituitary
https://www.readbyqxmd.com/read/29337169/the-prognostic-role-of-gender-and-mgmt-methylation-status-in-glioblastoma-patients-the-female-power
#3
Enrico Franceschi, Alicia Tosoni, Santino Minichillo, Roberta Depenni, Alexandro Paccapelo, Stefania Bartolini, Maria Michiara, Giacomo Pavesi, Benedetta Urbini, Girolamo Crisi, Michele A Cavallo, Luigino Tosatto, Claudio Dazzi, Claudia Biasini, Giuseppe Pasini, Damiano Balestrini, Francesca Zanelli, Vania Ramponi, Antonio Fioravanti, Ermanno Giombelli, Dario De Biase, Agostino Baruzzi, Alba A Brandes
BACKGROUND: Clinical and molecular factors are essential to define prognosis in glioblastoma (GBM) patients. MGMT methylation status, age, Karnofsky performance status (KPS) and extent of surgical resection are the most relevant prognostic factors. The role of gender in predicting patients prognosis has been investigated showing a slight survival advantage for female patients. METHODS: We performed a prospective evaluation from a registry called the Project of Emilia Romagna on Neuro-Oncology (PERNO) about prognostic factors in GBM patients who received standard treatment...
January 11, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29333122/metformin-enhanced-in-vitro-radiosensitivity-associates-with-g2-m-cell-cycle-arrest-and-elevated-adenosine-5-monophosphate-activated-protein-kinase-levels-in-glioblastoma
#4
Sebastian Adeberg, Denise Bernhardt, Semi B Harrabi, Nils H Nicolay, Juliane Hörner-Rieber, Laila König, Michael Repka, Angela Mohr, Amir Abdollahi, Klaus-Josef Weber, Juergen Debus, Stefan Rieken
Background: It is hypothesized that metabolism plays a strong role in cancer cell regulation. We have recently demonstrated improved progression-free survival in patients with glioblastoma who received metformin as an antidiabetic substance during chemoradiation. Although metformin is well-established in clinical use the influence of metformin in glioblastoma is far from being understood especially in combination with other treatment modalities such as radiation and temozolomide. Materials and Methods: In this study, we examined the influence of metformin in combinations with radiation and temozolomide on cell survival (clonogenic survival), cell cycle (routine flow cytometric analysis, FACScan), and phosphorylated Adenosine-5'-monophosphate-activated protein kinase (AMPK) (Phopho-AMPKalpha1 - ELISA) levels in glioblastoma cell lines LN18 and LN229...
December 2017: Radiology and Oncology
https://www.readbyqxmd.com/read/29331023/temozolomide-analog-pmx-465-downregulates-mgmt-expression-in-hct116-colorectal-carcinoma-cells
#5
Zhikuan Yang, Danping Wei, Feifei Liu, Jing Liu, Xiaoming Wu, Malcolm F G Stevens, Tracey D Bradshaw, Ying Luo, Jihong Zhang
The efficacy of temozolomide (TMZ) treatment for cancers is currently limited by inherent or the development of resistance, particularly, but not exclusively, due to the expression of the DNA repair enzyme O6-methylguanine-DNA methyltransferase (MGMT) in a significant proportion of tumors. We have found that TMZ analog C8-methyl imidazole tetrazine (PMX 465) displayed good anticancer activity against the colorectal carcinoma HCT116 cells which are MGMT-overexpressing and mismatch repair (MMR)-deficient. In this study, we found that PMX 465 could downregulate the expression of MGMT in HCT116 cells at the protein and mRNA levels...
January 13, 2018: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29330228/treatment-of-aggressive-pituitary-tumours-and-carcinomas-results-of-a-european-society-of-endocrinology-ese-survey-2016
#6
Ann I McCormack, Olaf Dekkers, Stephan Petersenn, Vera Popovic, Jacqueline Trouillas, Gerald Raverot, Pia Burman
OBJECTIVE: To collect outcome data in a large cohort of patients with aggressive pituitary tumours (APT)/carcinomas (PC), and specifically report effects of temozolomide (TMZ) treatment. DESIGN: Electronic survey to ESE members Dec 2015-Nov 2016. RESULTS: Reports on 165 patients (40 PC, 125 APT) were obtained. Median age at diagnosis was 43 (range 4-79) years. 69% of the tumours were clinically functioning, and the most frequent immunohistochemical subtype were corticotroph tumours (45%)...
January 12, 2018: European Journal of Endocrinology
https://www.readbyqxmd.com/read/29325930/integrated-study-on-comparative-transcriptome-and-skeletal-muscle-function-in-aged-rats
#7
Jing Zhou, Zhiyin Liao, Jinliang Chen, Kexiang Zhao, Qian Xiao
The present study aimed to reveal aging-related changes in the skeletal muscle of SD rats by comparing transcriptome analysis, integrated with muscle physiological parameters. Ten rats aged 25 months were set as the old group (OG) and ten rats aged 6 months were set as the young group (YG). After 6 weeks of feeding, the body mass, grip strength, and gastrocnemius muscle mass were determined, and the differentially expressed genes were analyzed by transcriptome sequencing, followed by GO enrichment analysis and KEGG analysis...
January 8, 2018: Mechanisms of Ageing and Development
https://www.readbyqxmd.com/read/29308563/immunohistochemical-features-of-o6-methylguanine-dna-methyltransferase-expression-during-ovarian-endometriosis
#8
A I Shchegolev, A G Bykov, N M Faizullina, L V Adamyan
A comparative immunohistochemical study for the expression of O6-methylguanine-DNA methyltransferase (MGMT) was performed in tissues of the eutopic endometrium and ovarian endometriosis. The highest level of MGMT expression in eutopic endometrial tissue was observed in epitheliocyte nuclei during the proliferative phase. In regions of endometriosis the expression of MGMT in epitheliocyte nuclei was shown to increase during stages I and II, but decreased in stages III and IV. The progression of endometriosis was accompanied by a gradual increase of study parameters in the nuclei and cytoplasm of stromal cells...
January 8, 2018: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29305787/molecular-profiling-of-short-term-and-long-term-surviving-patients-identifies-cd34-mrna-level-as-prognostic-for-glioblastoma-survival
#9
Signe Regner Michaelsen, Thomas Urup, Lars Rønn Olsen, Helle Broholm, Ulrik Lassen, Hans Skovgaard Poulsen
Despite extensive treatment, overall survival (OS) for glioblastoma (GBM) remains poor. A small proportion of patients present long survival over 3 years, but the underlying molecular background separating these long-term survivors (LTS) from short-term survivors (STS) are insufficiently understood. Accordingly, study aim was to identify independent prognostic biomarkers for survival. Study cohort consisted of 93 primary GBM patients treated with radiation-, chemo- and bevacizumab therapy, among which 14 STS (OS ≤ 12 months) and 6 LTS (OS ≥ 36 months) were identified, all confirmed being IDH wild-type...
January 5, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29302887/analysis-of-immunobiologic-markers-in-primary-and-recurrent-glioblastoma
#10
Maryam Rahman, Jesse Kresak, Changlin Yang, Jianping Huang, Wesley Hiser, Paul Kubilis, Duane Mitchell
Glioblastoma (GBM) generates a varied immune response and understanding the immune microenvironment may lead to novel immunotherapy treatments modalities. The goal of this study was to evaluate the expression of immunologic markers of potential clinical significance in primary versus recurrent GBM and assess the relationship between these markers and molecular characteristics of GBM. Human GBM samples were evaluated and analyzed with immunohistochemistry for multiple immunobiologic markers (CD3, CD8, FoxP3, CD68, CD163, PD1, PDL1, CTLA4, CD70)...
January 4, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29301329/differential-characterization-of-temozolomide-resistant-human-glioma-cells
#11
Sheng-Wei Lai, Bor-Ren Huang, Yu-Shu Liu, Hsiao-Yun Lin, Chun-Chuan Chen, Cheng-Fang Tsai, Dah-Yuu Lu, Chingju Lin
Glioblastoma multiforme (GBM) is the most common type of primary and malignant tumor occurring in the adult central nervous system. Temozolomide (TMZ) has been considered to be one of the most effective chemotherapeutic agents to prolong the survival of patients with glioblastoma. Many glioma cells develop drug-resistance against TMZ that is mediated by increasing O-6-methylguanine-DNA methyltransferase (MGMT) levels. The expression of connexin 43 was increased in the resistant U251 subline compared with the parental U251 cells...
January 2, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29298992/germline-variants-in-il4-mgmt-and-akt1-are-associated-with-prostate-cancer-specific-mortality-an-analysis-of-12-082-prostate-cancer-cases
#12
L M FitzGerald, S Zhao, A Leonardson, M S Geybels, S Kolb, D W Lin, J L Wright, R Eeles, Z Kote-Jarai, K Govindasami, G G Giles, M C Southey, J Schleutker, T L Tammela, C Sipeky, K L Penney, M J Stampfer, H Gronberg, F Wiklund, P Stattin, J Hugosson, D M Karyadi, E A Ostrander, Z Feng, J L Stanford
BACKGROUND: Prostate cancer (PCa) is a leading cause of mortality and genetic factors can influence tumour aggressiveness. Several germline variants have been associated with PCa-specific mortality (PCSM), but further replication evidence is needed. METHODS: Twenty-two previously identified PCSM-associated genetic variants were genotyped in seven PCa cohorts (12,082 patients; 1544 PCa deaths). For each cohort, Cox proportional hazards models were used to calculate hazard ratios and 95% confidence intervals for risk of PCSM associated with each variant...
January 3, 2018: Prostate Cancer and Prostatic Diseases
https://www.readbyqxmd.com/read/29295569/extent-of-resection-in-newly-diagnosed-glioblastoma-impact-of-a-specialized-neuro-oncology-care-center
#13
Amer Haj, Christian Doenitz, Karl-Michael Schebesch, Denise Ehrensberger, Peter Hau, Kurt Putnik, Markus J Riemenschneider, Christina Wendl, Michael Gerken, Tobias Pukrop, Alexander Brawanski, Martin A Proescholdt
Treatment of glioblastoma (GBM) consists of microsurgical resection followed by concomitant radiochemotherapy and adjuvant chemotherapy. The best outcome regarding progression free (PFS) and overall survival (OS) is achieved by maximal resection. The foundation of a specialized neuro-oncology care center (NOC) has enabled the implementation of a large technical portfolio including functional imaging, awake craniotomy, PET scanning, fluorescence-guided resection, and integrated postsurgical therapy. This study analyzed whether the technically improved neurosurgical treatment structure yields a higher rate of complete resection, thus ultimately improving patient outcome...
December 25, 2017: Brain Sciences
https://www.readbyqxmd.com/read/29285591/is-a-pretreatment-radiological-staging-system-feasible-for-suggesting-the-optimal-extent-of-resection-and-predicting-prognosis-in-glioblastoma-an-observational-study
#14
Jaume Capellades, Josep Puig, Sira Domenech, Teresa Pujol, Laura Oleaga, Angels Camins, Carles Majós, Rocio Diaz, Christian de Quintana, Pilar Teixidor, Gerard Conesa, Gerard Plans, Josep Gonzalez, Natalia García-Balañà, Jose Maria Velarde, Carmen Balaña
To assess the value of resection in glioblastoma based on pre-surgical tumor characteristics and a subsequent staging system. The lack of a staging system for glioblastoma hinders the analysis of treatment outcome. We classified 292 uniformly treated glioblastoma patients as stage I, II, or III based on tumor size, location, and eloquence and then analyzed the impact of the extent of resection. We classified 62% of patients as stage I, 25.3% as stage II, and 12.7% as stage III. Gross total resection (GTR) was performed mainly in stage I rather than stage II or III patients (79...
December 28, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29285383/effect-of-o6-methylguanine-dna-methyltransferase-methylation-in-medulloblastoma
#15
Tomoko Kurimoto, Akihide Kondo, Ikuko Ogino, Junya Fujimura, Atsushi Arakawa, Hajime Arai, Toshiaki Shimizu
Medulloblastoma is a highly malignant brain tumor that predominately affects children and requires multimodal treatment, including chemotherapy with alkylating agents. O6-methylguanine-DNA methyltransferase (MGMT) is a DNA repair enzyme that plays an important role in tumor resistance to alkylating agents. Recent studies demonstrated that MGMT promoter methylation suppresses the expression of MGMT and is associated with favorable outcomes of malignant glioma patients. However, the MGMT methylation status and its prognostic impact on medulloblastoma have not been fully elucidated to date...
December 2017: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/29276718/a-nonhuman-primate-transplantation-model-to-evaluate-hematopoietic-stem-cell-gene-editing-strategies-for-%C3%AE-hemoglobinopathies
#16
Olivier Humbert, Christopher W Peterson, Zachary K Norgaard, Stefan Radtke, Hans-Peter Kiem
Reactivation of fetal hemoglobin (HbF) is a promising approach for the treatment of β-hemoglobinopathies and the targeting of genes involved in HbF regulation is under intensive investigation. Here, we established a nonhuman primate (NHP) transplantation model to evaluate hematopoietic stem cell (HSC)-based gene editing strategies aimed at reactivating HbF. We first characterized the transient HbF induction to autologous HSC transplantation in pigtailed macaques, which was comparable in duration and amplitude to that of human patients...
March 16, 2018: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/29251333/efficacy-of-ribavirin-against-malignant-glioma-cell-lines-follow-up-study
#17
Yushi Ochiai, Emiko Sano, Yutaka Okamoto, Sodai Yoshimura, Kotaro Makita, Shun Yamamuro, Takashi Ohta, Akiyoshi Ogino, Hisashi Tadakuma, Takuya Ueda, Tomohiro Nakayama, Hiroyuki Hara, Atsuo Yoshino, Yoichi Katayama
Ribavirin, a nucleic acid analog, has been employed as an antiviral agent against RNA and DNA viruses and has become the standard agent used for chronic hepatitis C in combination with interferon-α2a. Furthermore, the potential antitumor efficacy of ribavirin has attracted increasing interest. Recently, we demonstrated a dose-dependent antitumor effect of ribavirin for seven types of malignant glioma cell lines. However, the mechanism underlying the antitumor effect of ribavirin has not yet been fully elucidated...
February 2018: Oncology Reports
https://www.readbyqxmd.com/read/29234914/discriminating-mgmt-promoter-methylation-status-in-patients-with-glioblastoma-employing-amide-proton-transfer-weighted-mri-metrics
#18
Shanshan Jiang, Qihong Rui, Yu Wang, Hye-Young Heo, Tianyu Zou, Hao Yu, Yi Zhang, Xianlong Wang, Yongxing Du, Xinrui Wen, Fangyao Chen, Jihong Wang, Charles G Eberhart, Jinyuan Zhou, Zhibo Wen
OBJECTIVES: To explore the feasibility of using amide proton transfer-weighted (APTw) MRI metrics as surrogate biomarkers to identify the O6-methylguanine-DNA methyltransferase (MGMT) promoter methylation status in glioblastoma (GBM). METHODS: Eighteen newly diagnosed GBM patients, who were previously scanned at 3T and had a confirmed MGMT methylation status, were retrospectively analysed. For each case, a histogram analysis in the tumour mass was performed to evaluate several quantitative APTw MRI metrics...
December 12, 2017: European Radiology
https://www.readbyqxmd.com/read/29229408/imbalance-in-dna-repair-machinery-is-associated-with-brafv600e-mutation-and-tumor-aggressiveness-in-papillary-thyroid-carcinoma
#19
Bruna S Lutz, Natalia M Leguisamo, Nicole K Cabral, Helena C Gloria, Keli C Reiter, Grasiela Agnes, Virgilio Zanella, Erika L S Meyer, Jenifer Saffi
The involvement of alterations in MLH1, an essential mismatch repair component, in BRAFV600E mutated papillary thyroid carcinoma (PTC) has been suggested to be associated with features of tumor aggressiveness. Thirty-two PTC and surrounding normal thyroid tissues were evaluated for 11 representative DNA repair genes expression. BRAFV600E mutational status assessment and clinicopathological correlations were evaluated for their gene and protein expression. BRAFV600E PTC is associated with lower levels of XPD and MLH1 gene expression...
December 8, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/29225516/hedgehog-gli1-signaling-pathway-regulates-mgmt-expression-and-chemoresistance-to-temozolomide-in-human-glioblastoma
#20
Ke Wang, Dongjiang Chen, Zhouqi Qian, Daming Cui, Liang Gao, Meiqing Lou
Background: Chemoresistance of glioblastoma (GBM) is a feature of this devastating disease. This study is to determine the relationship between Hedgehog (HH)/Gli1 signaling pathway and chemoresistance to temozolomide (TMZ) in human GBM. Methods: We analyzed Gli1 nuclear staining and O6-methylguanine DNA methyltransferase (MGMT) expression in 48 cases of primary GBM tissues by immunohistochemistry. Quantitative PCR, western blot, methylation-specific PCR, cell proliferation and apoptosis assay were used to investigate changes of MGMT expression and chemosensitivity to TMZ after manipulating HH/Gli1 signaling activity in A172 and U251 GBM cell lines...
2017: Cancer Cell International
keyword
keyword
5501
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"