Displaying publications 61 - 80 of 149 in total

Abstract:
Sort:
  1. Orbital rhabdomyosarcoma in an HIV positive child
    Khairy-Shamel ST, Shatriah I, Adil H, Zunaina E, Bakiah S, Rohaizan Y, et al.
    Orbit, 2008;27(5):388-90.
    PMID: 18836940 DOI: 10.1080/01676830802336629
    We reported a case of orbital rhabdomyosarcoma with an intracranial extension in an HIV-infected child. It was an uncommon sarcoma in a retroviral-positive patient that resulted in a diagnostic and therapeutic dilemma. The child is currently asymptomatic following surgery, chemotherapy, and reinstitution of highly active retroviral therapy (HAART).
    Matched MeSH terms: Brain Neoplasms/pathology*; Brain Neoplasms/radiography; Brain Neoplasms/surgery
  2. Prognostic factors in patients with non-small cell lung carcinoma and brain metastases: a Malaysian perspective
    Tang WH, Alip A, Saad M, Phua VC, Chandran H, Tan YH, et al.
    Asian Pac J Cancer Prev, 2015;16(5):1901-6.
    PMID: 25773842
    BACKGROUND: Brain metastases occur in about 20-40% of patients with non-small-cell lung carcinoma (NSCLC), and are usually associated with a poor outcome. Whole brain radiotherapy (WBRT) is widely used but increasingly, more aggressive local treatments such as surgery or stereotactic radiosurgery (SRS) or stereotactic radiotherapy (SRT) are being employed. In our study we aimed to describe the various factors affecting outcomes in NSCLC patients receiving local therapy for brain metastases.

    MATERIALS AND METHODS: The case records of 125 patients with NSCLC and brain metastases consecutively treated with radiotherapy at two tertiary centres from January 2006 to June 2012 were analysed for patient, tumour and treatment-related prognostic factors. Patients receiving SRS/SRT were treated using Cyberknife. Variables were examined in univariate and multivariate testing.

    RESULTS: Overall median survival was 3.4 months (95%CI: 1.7-5.1). Median survival for patients with multiple metastases receiving WBRT was 1.5 months, 1-3 metastases receiving WBRT was 3.6 months and 1-3 metastases receiving surgery or SRS/SRT was 8.9 months. ECOG score (≤2 vs >2, p=0.001), presence of seizure (yes versus no, p=0.031), treatment modality according to number of brain metastases (1-3 metastases+surgery or SRS/SRT±WBRT vs 1-3 metastases+WBRT only vs multiple metastases+WBRT only, p=0.007) and the use of post-therapy systemic treatment (yes versus no, p=0.001) emerged as significant on univariate analysis. All four factors remained statistically significant on multivariate analysis.

    CONCLUSIONS: ECOG ≤2, presence of seizures, oligometastatic disease treated with aggressive local therapy (surgery or SRS/SRT) and the use of post-therapy systemic treatment are favourable prognostic factors in NSCLC patients with brain metastases.

    Matched MeSH terms: Brain Neoplasms/mortality; Brain Neoplasms/radiotherapy*; Brain Neoplasms/secondary
  3. Current Perspectives on Therapies, Including Drug Delivery Systems, for Managing Glioblastoma Multiforme
    Bhaskaran M, Devegowda VG, Gupta VK, Shivachar A, Bhosale RR, Arunachalam M, et al.
    ACS Chem Neurosci, 2020 10 07;11(19):2962-2977.
    PMID: 32945654 DOI: 10.1021/acschemneuro.0c00555
    Glioblastoma multiforme (GBM), a standout among the most dangerous class of central nervous system (CNS) cancer, is most common and is an aggressive malignant brain tumor in adults. In spite of developments in modality therapy, it remains mostly incurable. Consequently, the need for novel systems, strategies, or therapeutic approaches for enhancing the assortment of active agents meant for GBM becomes an important criterion. Currently, cancer research focuses mainly on improving the treatment of GBM via diverse novel drug delivery systems. The treatment options at diagnosis are multimodal and include radiation therapy. Moreover, significant advances in understanding the molecular pathology of GBM and associated cell signaling pathways have opened opportunities for new therapies. Innovative treatment such as immunotherapy also gives hope for enhanced survival. The objective of this work was to collect and report the recent research findings to manage GBM. The present review includes existing novel drug delivery systems and therapies intended for managing GBM. Reported novel drug delivery systems and diverse therapies seem to be precise, secure, and relatively effective, which could lead to a new track for the obliteration of GBM.
    Matched MeSH terms: Brain Neoplasms
  4. Observation of tumour-induced reorganization in structural and functional architecture of the brain in three pre-surgical patients with left frontal-temporal brain tumour: a combination of MEG, DTI and neuropsychological assessment
    Hanani Abdul Manan, Zamzuri Idris, Jafri Malin Abdullah, Mohammed Faruque Reza, Wan Nor Azlen Wan Mohamad
    Sains Malaysiana, 2017;46:1877-1886.
    Visual function is mainly located within the bilateral hemisphere of the occipital lobes of the brain. However, our functional magnetoencephalography (MEG) result has demonstrated the reorganization of brain activity in the occipital area in patients with left-sided brain tumour. The results showed that brain laterality changes from bilateral to unilateral activation of the occipital area. Right occipital area (contralateral areas to the tumour), shows increase intensity of activation. Diffusion tensor imaging (DTI) with fibre tracking was performed to further investigate this brain laterality modification and the findings confirmed there is an alteration in the left hemisphere fibre optic tracts. This functional modification and changes of the brain laterality and optic tracts in the brain is suspected to be the result of tumour growth induced changes. The present observation will be discussed in term of the mechanism of tumour induced reorganization and changes with the corroborating evidence from MEG, DTI and neuropsychological assessment.
    Matched MeSH terms: Brain Neoplasms
  5. Fulltext Accumulation of Mitochondrial DNA Microsatellite Instability in Malaysian Patients with Primary Central Nervous System Tumors
    Radzak S, Khair Z, Ahmad F, Idris Z, Yusoff A
    Turk Neurosurg, 2021;31(1):99-106.
    PMID: 33491172 DOI: 10.5137/1019-5149.JTN.27893-20.4
    AIM: To determine the mitochondrial microsatellite instability (mtMSI) status in a series of Malaysian patients with brain tumors. Furthermore, we analyzed whether the mtMSI status is associated with the clinicopathological features of the patients.

    MATERIAL AND METHODS: Forty fresh frozen tumor tissues along with blood samples of brain tumor patients were analyzed for mtMSI by PCR amplification of genomic DNAs, and the amplicons were directly sequenced in both directions using Sanger sequencing.

    RESULTS: Microsatellite analysis revealed that 20% (8 out of 40) of the tumors were mtMSI positive with a total of 8 mtMSI changes. All mtMSI markers were detected in D310 and D16184 of the D-loop region. Additionally, no significant association was observed between mtMSI status and clinicopathological features.

    CONCLUSION: The variations, specifically the mtMSI, suggest that the mitochondrial DNA (mtDNA) can be targeted for genomic alteration in brain tumors. Therefore, the specific role of mtDNA alteration in brain tumor development and prognosis requires further investigation.

    Matched MeSH terms: Brain Neoplasms/diagnosis; Brain Neoplasms/genetics*; Brain Neoplasms/epidemiology*
  6. MRI Brain Classification Using the Quantum Entropy LBP and Deep-Learning-Based Features
    Hasan AM, Jalab HA, Ibrahim RW, Meziane F, Al-Shamasneh AR, Obaiys SJ
    Entropy (Basel), 2020 Sep 15;22(9).
    PMID: 33286802 DOI: 10.3390/e22091033
    Brain tumor detection at early stages can increase the chances of the patient's recovery after treatment. In the last decade, we have noticed a substantial development in the medical imaging technologies, and they are now becoming an integral part in the diagnosis and treatment processes. In this study, we generalize the concept of entropy difference defined in terms of Marsaglia formula (usually used to describe two different figures, statues, etc.) by using the quantum calculus. Then we employ the result to extend the local binary patterns (LBP) to get the quantum entropy LBP (QELBP). The proposed study consists of two approaches of features extractions of MRI brain scans, namely, the QELBP and the deep learning DL features. The classification of MRI brain scan is improved by exploiting the excellent performance of the QELBP-DL feature extraction of the brain in MRI brain scans. The combining all of the extracted features increase the classification accuracy of long short-term memory network when using it as the brain tumor classifier. The maximum accuracy achieved for classifying a dataset comprising 154 MRI brain scan is 98.80%. The experimental results demonstrate that combining the extracted features improves the performance of MRI brain tumor classification.
    Matched MeSH terms: Brain Neoplasms
  7. Fulltext Association of angiogenic cells in the tumour microenvironment and the circulating matured endothelial cells in astrocytic glioma
    Das, Priscilla, Naing, Nyi Nyi, Nadiah Wan-Arfah, Noorjan, KON, Yee, Cheng Kueh, Rasalingam, Kantha
    International Medical Journal Malaysia, 2018;17(2):3-10.
    MyJurnal
    Introduction: Astrocytic gliomas are the most common and lethal intracranial brain tumours and rely on angiogenesis for the tumour development. Endothelial progenitor cells (EPCs) contribute to the angiogenesis of glioma tumour. Objectives: The study aimed to investigate the matured circulating endothelial cells population in the peripheral blood mononuclear cells (PBMCs) and its associations with tissue resident angiogenic cells in astrocytic glioma patients. Methods: A total of 22 astrocytic glioma patients were recruited from Hospital Universiti Sains Malaysia. Tumour were sliced and stained with CD133+ and VEGFA+ for angiogenic cells (n=22). The circulating (CD133-/VEGFR2+) matured endothelial cells in PBMCs (n=22) were quantified using FACS. The paired t-test and Pearson correlation test were used for the data analysis. Results: The angiogenic cells in brain tumour tissue were significantly higher compared to adjacent normal brain tissue (median 1.07±0.96% vs. median 0.69±0.68%; Wilcoxon signed rank test Z=-3.100; p=0.002). Positive correlation was found between the angiogenic cells of brain tumour tissue and adjacent normal brain tissue (Spearman’s rho correlation test, r=0.56; p=0.007). Significant positive correlation was found between matured endothelial cells in peripheral circulating systems and angiogenic cells in tumour of astrocytic glioma patients (Pearson correlation test, r=0.60, p=0.003).Conclusion:The findings of the study give support to the possible roles of EPCs in astrocytic glioma patients. Thus targeting tissue resident angiogenic cells and matured circulating endothelial cells by antiangiogenic treatment might be useful to prevent the tumour growth.
    Matched MeSH terms: Brain Neoplasms
  8. Fulltext Evaluation Study of Intraoperative Cytology Smear and Frozen Section of Glioma
    Zulkarnain S, Yunus N, Kandasamy R, Zun AB, Mat Zin AA
    Asian Pac J Cancer Prev, 2020 Oct 01;21(10):3085-3091.
    PMID: 33112571 DOI: 10.31557/APJCP.2020.21.10.3085
    OBJECTIVE: Glioma is the commonest primary malignant brain tumour. Diagnosis is made based on cytology smear, frozen section and histopathological examination. Intraoperative pathological diagnosis using either cytology smear, frozen section or combination of both, plays a crucial role in patient's future management and prognosis. This study aims to determine the accuracy of cytology smear and frozen section in glioma, and to compare the difference between both techniques.

    METHODS: A cross-sectional study was conducted involving 22 cases of glioma diagnosed intraoperatively from January 2013 until August 2019 in Hospital Universiti Sains Malaysia. The selected tissues were processed for cytology smear and frozen section. The remaining tissues were proceeded for paraffin section. The diagnosis was categorized as either low-grade or high-grade glioma based on cellularity, nuclear pleomorphism, mitotic count, microvascular proliferation and necrosis. The sensitivity and specificity of frozen section and cytology smears were determined based on paraffin section being as the gold standard. The accuracy of both techniques was compared using statistical analysis.

    RESULTS: The overall sensitivity and specificity of cytology smear were 100% and 76.9%, respectively. Meanwhile, the sensitivity and specificity of frozen section were 100% and 84.6%. There was no significant difference in diagnostic accuracy between cytology smear and frozen section in glioma (p>0.05).

    CONCLUSION: Cytology smears provides an alternative method for frozen section due to good cellularity and morphology on smear. Cytology smear is rapid, inexpensive, small amount of tissue requirement and less technical demand. This finding may benefit to the hospital or treatment centres where frozen section facility is unavailable.

    Matched MeSH terms: Brain Neoplasms/epidemiology; Brain Neoplasms/pathology*; Brain Neoplasms/surgery
  9. Cerebral metastases from choriocarcinoma. Results of chemotherapy
    Sen DK, Sivanesaratnam V, Chuah CY, Ch'ng SL, Singh J, Paramsothy M
    Acta Obstet Gynecol Scand, 1987;66(5):425-8.
    PMID: 3425244
    Of 36 cases of choriocarcinoma treated at the University Hospital Kuala Lumpur during 1980-84 inclusive, 6 patients were found to have cerebral metastases. Intrathecal methotrexate and combination chemotherapy were started in all cases, with monitoring of tumor growth by serial beta-HCG assays and CT scanning of brain and lung. Chemotherapy was reduced because of severe toxicity in 2 patients, one of whom received radiotherapy to the brain. Four patients (66%) have now been in remission for 2.5-6 years. Two did not respond to therapy and died. The factors involved in therapy and response are discussed.
    Matched MeSH terms: Brain Neoplasms/drug therapy; Brain Neoplasms/mortality; Brain Neoplasms/secondary*
  10. Fulltext In silico homology modelling and identification of Tousled-Like Kinase 1 Inhibitors for Glioblastoma therapy via high throughput virtual screening proteinligand docking
    Kamariah Ibrahim, Abubakar Danjuma Abdullahi, Nor Azian Abdul Murad, Roslan Harun, Rahman Jamal
    Asia-Pacific Journal of Molecular Medicine, 2018;8(1):1-14.
    MyJurnal
    Glioblastoma multiforme (GBM) is a high-grade brain tumor of which the survival patients remain poor.
    Tousled-like kinase 1 (TLK1), a serine-threonine kinase, was identified to be overexpressed in cancers such
    as GBM. TLK1 plays an important role in controlling survival pathways. To date, there is no structure
    available for TLK1 as well as its inhibitors. We aimed to create a homology model of TLK1 and to identify
    suitable molecular inhibitors that are likely to bind and inhibit TLK1 activity via in silico high-throughput
    virtual screening (HTVS) protein-ligand docking. The 3D homology models of TLK1 were derived from
    various servers. All models were evaluated using Swiss Model QMEAN server. Validation was performed
    using multiple tools. Energy minimization was performed using YASARA. Subsequently, HTVS was
    performed using Molegro Virtual Docker 6.0 and ligands derived from ligand.info database. Drug-like
    molecules were filtered using ADME-Tox filtering program. Best homology model was obtained from the
    Aurora B kinase (PDB ID:4B8M) derived from Xenopus levias structure that share sequence similarity with
    human TLK1. Two compounds were identified from HTVS to be the potential inhibitors as it did not violate
    the Lipinski rule of five and the CNS-based filter as a potential drug-like molecule for GBM
    Matched MeSH terms: Brain Neoplasms
  11. Fulltext Intracranial germinoma – a case report
    Subha, S.T., Puaviappan, P., Ramesh, N., Dass, Dipak B
    Malaysian Journal of Medicine and Health Sciences, 2013;9(1):81-82.
    MyJurnal
    Intracranial germinomas belong to the class of germ cell tumors which are relatively rare intracranial tumors. Early recognition of this neoplasm is vital as germinomas are highly radiosensitive and effective/ early radiation therapy can result in relatively favourable overall prognosis. In this article we describe a 19 years old man who presented with pituitary tumor in the suprasellar region for which transsphenoidal decompression and biopsy was done. The histopathological examination confirmed it to be germinoma and he underwent craniospinal radiotherapy.
    Matched MeSH terms: Brain Neoplasms
  12. Fulltext Radiation-induced meningioma following radiotherapy for pituitary adenonoma: a case report
    Ellyda, M.N., Win Mar@Salmah, J.
    International Medical Journal Malaysia, 2013;12(1):63-66.
    MyJurnal
    It is well known that ionizing radiation has an onco-genetic activity and has been implicated in the causation of brain tumors. However, when a new growth appears adjacent to the site of previous tumor, the diagnosis is more toward recurrence. In addition to that, the possible cause might be overlooked, when it occurs many years after radiation treatment. We report a case of radiation-induced meningioma developed 20 years after the patient received radiotherapy for pituitary adenoma.
    Matched MeSH terms: Brain Neoplasms
  13. Fulltext Multicompartmental congenital intracranial immature teratoma
    Ganesan, Dharmendra, Sheau, Fung Sia, Narayann, Vairavan, Kumar, Gnana, Lum, Lucy, Chan,Lucy, et al.
    Neurology Asia, 2013;18(1):117-121.
    MyJurnal
    Congenital intracranial tumors are rare and account for 0.5 to 1.5% of all childhood tumours. We report a case of a 3 week old baby presenting with multi compartmental congenital intracranial immature teratoma, first of its kind in the literature. The child had gross total excision in two stages with aid of neuronavigation. The short term outcome was good. The four years of follow-up with serial imaging showed no tumour recurrence with a stable hydrocephalus after shunting. However, there is global developmental delay with full time dependence of care giver.
    Matched MeSH terms: Brain Neoplasms
  14. Fulltext Posterior Fossa Intradiploic Epidermoid Cyst: A case report
    Ng, Wei Ping, Liew, BS, Gee, TS, Azmin KR
    International Medical Journal Malaysia, 2015;14(2):67-70.
    MyJurnal
    Epidermoid cysts are rare, benign congenital tumours of ectodermal origin which typically present between
    the third to fifth decade. These tumours comprise approximately 0.2-1.8% of all intracranial tumours. Though
    these pearly tumours are potentially curable, subtotal resection may lead to catastrophic complications such as
    recurrence, granulomatous meningitis and carcinomatous degeneration of cyst wall. We herein report the case
    of a 36-year-old man who presented with an unusual mixed density posterior fossa epidermoid cyst on imaging
    studies. Total removal not only cures both tumour and seizure attack in this case but also preserves patient’s
    neurological function.
    Matched MeSH terms: Brain Neoplasms
  15. Fulltext Association of tumor angiogenic cells (cd133+/vegfa+) and circulating cancer stem cells (cd133+/vegfr2-) in astrocytic glioma patients
    Das, P., Naing, N.N., Wan-Arfah, N., Noorjan, K., Kueh, Y.C., Rasalingam, K.
    JUMMEC, 2019;22(2):31-38.
    MyJurnal
    Background: Astrocytic gliomas are the most common primary brain tumors that developed from glial origin.
    The angiogenic cell population from brain tumor enhances the recruitment of circulating cancer stem cells
    homing towards tumor site.

    Objectives: This study aimed to investigate the tumor angiogenic cell population that stained with CD133+
    and VEGFA+ markers and its association with circulating cancer stem cell (CD133+/VEGFR2-) population in the
    peripheral blood mononuclear cells (PBMCs) of astrocytic glioma patients.

    Methods: A total of 22 astrocytic glioma patients from Hospital Universiti Sains Malaysia who consented to
    the study were included. Tumors (n=22) were sliced and stained with CD133+ and VEGFA+ angiogenic markers
    and counter stained with DAPI. The circulating cancer stem cells (CD133+/VEGFR2-) in PBMCs (n=22) were
    quantified using FACS based on the expression of CD133 and VEGFR2 markers. The paired t-test and Pearson
    correlation were used for the data analysis.

    Results: The percentage of angiogenic cell population was significantly higher in brain tumor compared to
    adjacent normal brain tissue (1.25 ± 0.96% vs. 0.74 ± 0.68%; paired t-test=2.855; df=21, p = 0.009). Positive
    correlation was found between the angiogenic cells of brain tumor tissue and adjacent normal brain tissue
    (Pearson correlation, r = 0.53, p = 0.011). Significant positive correlation was found between angiogenic cells
    in glioma tumor and cancer stem cells in peripheral circulating systems of astrocytic glioma patients (Pearson
    correlation, r = 0.42, p = 0.049).

    Conclusion: Angiogenic cells in the brain tumor resident promote the recruitment of circulating cancer stem cells
    homing to the tumor site and induce the proliferation and growth of the tumor in astrocytic glioma patients.
    Matched MeSH terms: Brain Neoplasms
  16. Fulltext Virus vector-mediated genetic modification of brain tumor stromal cells after intravenous delivery
    Volak A, LeRoy SG, Natasan JS, Park DJ, Cheah PS, Maus A, et al.
    J Neurooncol, 2018 Sep;139(2):293-305.
    PMID: 29767307 DOI: 10.1007/s11060-018-2889-2
    The malignant primary brain tumor, glioblastoma (GBM) is generally incurable. New approaches are desperately needed. Adeno-associated virus (AAV) vector-mediated delivery of anti-tumor transgenes is a promising strategy, however direct injection leads to focal transgene spread in tumor and rapid tumor division dilutes out the extra-chromosomal AAV genome, limiting duration of transgene expression. Intravenous (IV) injection gives widespread distribution of AAV in normal brain, however poor transgene expression in tumor, and high expression in non-target cells which may lead to ineffective therapy and high toxicity, respectively. Delivery of transgenes encoding secreted, anti-tumor proteins to tumor stromal cells may provide a more stable and localized reservoir of therapy as they are more differentiated than fast-dividing tumor cells. Reactive astrocytes and tumor-associated macrophage/microglia (TAMs) are stromal cells that comprise a large portion of the tumor mass and are associated with tumorigenesis. In mouse models of GBM, we used IV delivery of exosome-associated AAV vectors driving green fluorescent protein expression by specific promoters (NF-κB-responsive promoter and a truncated glial fibrillary acidic protein promoter), to obtain targeted transduction of TAMs and reactive astrocytes, respectively, while avoiding transgene expression in the periphery. We used our approach to express the potent, yet toxic anti-tumor cytokine, interferon beta, in tumor stroma of a mouse model of GBM, and achieved a modest, yet significant enhancement in survival compared to controls. Noninvasive genetic modification of tumor microenvironment represents a promising approach for therapy against cancers. Additionally, the vectors described here may facilitate basic research in the study of tumor stromal cells in situ.
    Matched MeSH terms: Brain Neoplasms/genetics; Brain Neoplasms/pathology; Brain Neoplasms/therapy*
  17. Fulltext Alveolar soft part sarcoma with brain metastases
    Perumall VV, Harun R, Sellamuthu P, Shah MSM
    Asian J Neurosurg, 2017 4 18;12(1):112-115.
    PMID: 28413551 DOI: 10.4103/1793-5482.144197
    Metastatic tumors are the most common mass lesions in the brain. This case reports a rare form of sarcoma with metastasis to the brain. The appropriate management of a patient with metastatic alveolar soft part sarcoma to the brain is discussed. Author describes a 32-year-old gentleman diagnosed with primary tumor at gluteus and distant metastases at lower lobe of right lung and the brain. Histopathology proves diagnosis as alveolar soft part sarcoma. Craniotomy with excision of brain lesion was done. Repeated magnetic resonance imaging of the brain after 2 months showed rapidly growing new lesions. The next step of management was made by the oncology team as recurrence rate was high and due to multi-systemic involvement. Patient was planned for palliative chemotherapy and to be reassessed later. This case report discusses the appropriate approach to any form of brain metastases and the role of early follow-up especially after surgery for better outcome and choice of post operative management such as radiotherapy or chemotherapy or both for malignant tumors. Based on this report, it was concluded that every brain tumor patient should be frequently monitored even in the outpatient setting as most of them are metastatic and rapidly spreading. The patient should be considered for radiotherapy or chemotherapy or both after surgery if the histopathology result is suggestive of malignancy.
    Matched MeSH terms: Brain Neoplasms
  18. Utility of multimaterial 3D printers in creating models with pathological entities to enhance the training experience of neurosurgeons
    Waran V, Narayanan V, Karuppiah R, Owen SL, Aziz T
    J. Neurosurg., 2014 Feb;120(2):489-92.
    PMID: 24321044 DOI: 10.3171/2013.11.JNS131066
    The advent of multimaterial 3D printers allows the creation of neurosurgical models of a more realistic nature, mimicking real tissues. The authors used the latest generation of 3D printer to create a model, with an inbuilt pathological entity, of varying consistency and density. Using this model the authors were able to take trainees through the basic steps, from navigation and planning of skin flap to performing initial steps in a craniotomy and simple tumor excision. As the technology advances, models of this nature may be able to supplement the training of neurosurgeons in a simulated operating theater environment, thus improving the training experience.
    Matched MeSH terms: Brain Neoplasms/surgery
  19. Fulltext Presence of telomerase activity with undetectable p16 gene mutation in Malaysian patients with brain tumor
    Jafri AM, Sarina S, George PJ, Nizam IM
    Med J Malaysia, 2004 Oct;59(4):480-5.
    PMID: 15779580 MyJurnal
    Recent study has shown that activation of the telomerase and p16 gene mutation are both necessary for tumorigenesis. Our objectives were to detect telomerase activity and investigate the possibility of p16 gene mutations in various types of brain tumor. We analyzed 23 tumor tissues collected in 2000 to 2002. Telomerase activity was detected by a TRAP assay using a TRAPEZE Telomerase Detection Kit (Intergen, Co). PCR-SSCP (Single Strand Conformation Polymorphism) analysis was performed to screen for p16 gene mutation at exon 1 and 2. The activity was detected in 26.1% of the brain tumor samples and mostly present in high-grade tumors. There was a significant association between telomerase activity status and tumor grade but not with patient criteria. Telomerase activity was detected in the analyzed tumors, supporting the fact that activation of telomerase is an important feature for tumorigenesis. There was no mobility shift of p16 gene using SSCP and suggested no mutation at exon 1 and 2 occurred in all samples. These results suggest that another mechanism of p16 gene alterations could be involved and associated with detectable telomerase activity in the progression of tumors.
    Matched MeSH terms: Brain Neoplasms/genetics*
  20. Fulltext Presence of allelic loss and PTEN mutations in malignant gliomas from Malay patients
    Zainuddin N, Jaafar H, Isa MN, Abdullah JM
    Med J Malaysia, 2004 Oct;59(4):468-79.
    PMID: 15779579
    Loss of heterozygosity (LOH) on several loci and mutations on PTEN tumor suppressor gene (10q23.3) occur frequently in sporadic gliomas. We have performed polymerase chain reaction (PCR)-LOH analysis using microsatellite markers and single-stranded conformational polymorphism (SSCP) analysis to determine the incidence of allelic losses on chromosome 10q, 9p, 17p and 13q and mutations of exons 5, 6 and 8 of the PTEN gene in malignant gliomas. Twelve of 23 (52.2%) malignant glioma cases showed allelic losses whereas 7 of 23, (30.4%) samples showed aberrant band patterns and mutations of the PTEN gene. Four of these cases showed LOH on 10q23 and mutations of the PTEN gene. The data on LOH indicated the involvement of different genes in gliomagenesis whereas mutations of the PTEN gene indicated the role of PTEN tumor suppressor gene in the progression of glioma in Malay population.
    Matched MeSH terms: Brain Neoplasms/genetics*
Related Terms
Filters
Contact Us

Please provide feedback to Administrator (afdal@afpm.org.my)

External Links