Displaying publications 1 - 20 of 49 in total

Abstract:
Sort:
  1. The Collaborative Ocular Tuberculosis Study (COTS) Consensus (CON) Group Meeting Proceedings
    Agrawal R, Testi I, Mahajan S, Yuen YS, Agarwal A, Rousselot A, et al.
    Ocul Immunol Inflamm, 2020 Apr 06.
    PMID: 32250731 DOI: 10.1080/09273948.2020.1716025
    An international, expert led consensus initiative was set up by the Collaborative Ocular Tuberculosis Study (COTS) group to develop systematic, evidence, and experience-based recommendations for the treatment of ocular TB using a modified Delphi technique process. In the first round of Delphi, the group identified clinical scenarios pertinent to ocular TB based on five clinical phenotypes (anterior uveitis, intermediate uveitis, choroiditis, retinal vasculitis, and panuveitis). Using an interactive online questionnaires, guided by background knowledge from published literature, 486 consensus statements for initiating ATT were generated and deliberated amongst 81 global uveitis experts. The median score of five was considered reaching consensus for initiating ATT. The median score of four was tabled for deliberation through Delphi round 2 in a face-to-face meeting. This report describes the methodology adopted and followed through the consensus process, which help elucidate the guidelines for initiating ATT in patients with choroidal TB.
  2. Standardization of Nomenclature for Ocular Tuberculosis - Results of Collaborative Ocular Tuberculosis Study (COTS) Workshop
    Agrawal R, Agarwal A, Jabs DA, Kee A, Testi I, Mahajan S, et al.
    Ocul Immunol Inflamm, 2019 Dec 10.
    PMID: 31821096 DOI: 10.1080/09273948.2019.1653933
    Purpose: To standardize a nomenclature system for defining clinical phenotypes, and outcome measures for reporting clinical and research data in patients with ocular tuberculosis (OTB).Methods: Uveitis experts initially administered and further deliberated the survey in an open meeting to determine and propose the preferred nomenclature for terms related to the OTB, terms describing the clinical phenotypes and treatment and reporting outcomes.Results: The group of experts reached a consensus on terming uveitis attributable to tuberculosis (TB) as tubercular uveitis. The working group introduced a SUN-compatible nomenclature that also defines disease "remission" and "cure", both of which are relevant for reporting treatment outcomes.Conclusion: A consensus nomenclature system has been adopted by a large group of international uveitis experts for OTB. The working group recommends the use of standardized nomenclature to prevent ambiguity in communication and to achieve the goal of spreading awareness of this blinding uveitis entity.
  3. Intravenous thrombolysis for multi-ethnic Asians with acute ischaemia stroke in Malaysian public primary stroke centres versus acute stroke ready hospitals: Comparison of real-world clinical outcomes
    Schee JP, Ang CL, Crystal Teoh SC, Tan HJ, Chew SH, Steven A, et al.
    Med J Malaysia, 2023 Sep;78(5):594-601.
    PMID: 37775485
    INTRODUCTION: Intravenous thrombolysis (IVT) with recombinant tissue plasminogen activator is beneficial in acute ischaemic stroke (AIS). We aim to compare the realworld clinical outcomes and service efficiency of IVT in Malaysian primary stroke centres (PSCs) versus acute stroke ready hospitals (ASRHs).

    MATERIALS AND METHODS: We conducted a multi-centre cohort study involving 5 PSCs and 7 ASRHs in Malaysia. Through review of medical records of AIS patients who received IVT from 01 January 2014 to 30 June 2021, real-world data was extracted for analysis. Univariate and multivariate regression models were employed to evaluate the role of PSCs versus ASRHs in post-IVT outcomes and complications. Statistical significance was set at p<0.05.

    RESULTS: A total of 313 multi-ethnic Asians, namely 231 from PSCs and 82 from ASRHs, were included. Both groups were comparable in baseline demographic, clinical, and stroke characteristics. The efficiency of IVT delivery (door-toneedle time), functional outcomes (mRS at 3 months post- IVT), and rates of adverse events (intracranial haemorrhages and mortality) following IVT were comparable between the 2 groups. Notably, 46.8% and 48.8% of patients in PSCs and ASRHs group respectively (p=0.752) achieved favourable functional outcome (mRS≤1 at 3 months post-IVT). Regression analyses demonstrated that post-IVT functional outcomes and adverse events were independent of the role of PSCs or ASRHs.

    CONCLUSION: Our study provides real-world evidence which suggests that IVT can be equally safe, effective, and efficiently delivered in ASRHs. This may encourage the establishment of more ASRHs to extend the benefits of IVT to a greater proportion of stroke populations and enhance the regional stroke care.

  4. Fulltext The National Medical Research Register--a vital link between current and future research
    Lim TO, Asmaliza SI, Goh PP, Michael AJ, Hon YK, Thandapani R, et al.
    Med J Malaysia, 2010 Jun;65 Suppl A:124-7.
    PMID: 21488472
    Registration of research proposal to a publicly accessible website with searchable function allows information sharing and ensures research transparency. The National Institutes of Health Malaysia, realising the importance of research registration, established the National Medical Research Register (NMRR) in 2007. The NMRR functions more than just a local register: it also links to ethics approval and MOH medical research grant application. It thus facilitates researchers in their application to the Ministry of Health Research and Ethics Committee (MREC) and for Ministry of Health research grant. In addition, MREC committee members can review research protocol on NMRR website, thus saving much time and resources. From May 2007 till December 2009, more than 3000 people have registered as NMRR public users and more than 1000 research proposals have been uploaded in NMRR. The number of registration of research proposals, clinical trials and industrial sponsored trials steadily increased from year 2007 to year 2009. The web-based NMRR is the first research register in the world that links research proposal registration to ethical review and research grant application. Its future plan is to be linked with publication. Therefore, it is indeed an innovation that Malaysians should be proud of.
  5. Comparison of Chlorella vulgaris dressing and sodium alginate dressing: an experimental study in rats
    Zailan N, Abdul Rashid AH, Das S, Abdul Mokti NA, Hassan Basri J, Teoh SL, et al.
    Clin Ter, 2010;161(6):515-21.
    PMID: 21181079
    Chlorella vulgaris (CV) is a green microalgae enriched with nutrients, vitamins, minerals and chlorophyll. The aim of our study was to evaluate the potential wound healing effects of CV as a dressing while comparing it to sodium alginate dressing.
  6. The effect of Piper betel extract on the wound healing process in experimentally induced diabetic rats
    Keat EC, Razak SS, Fadil NM, Yusof FM, Chan LH, Chyi FK, et al.
    Clin Ter, 2010;161(2):117-20.
    PMID: 20499023
    Piper betel (PB) possesses antimicrobial, antifungal, antioxidant and wound healing properties due to its powerful antioxidant effect. Diabetes mellitus (DM) is a metabolic disorder which is associated with complications like impaired wound healing, nephropathy and neuropathy. The main aim of the study was to study the wound healing properties of PB.
  7. Identification of reference genes for real-time polymerase chain reaction gene expression studies in Nile rats fed Water-Soluble Palm Fruit Extract
    Leow SS, Lee WK, Khoo JS, Teoh S, Hoh CC, Fairus S, et al.
    Mol Biol Rep, 2020 Dec;47(12):9409-9427.
    PMID: 33222119 DOI: 10.1007/s11033-020-06003-3
    The Nile rat (Arvicanthis niloticus) is a novel diurnal carbohydrate-sensitive rodent useful for studies on type 2 diabetes mellitus (T2DM) and the metabolic syndrome. Hepatic responses to T2DM and any interventions thereof can be evaluated via transcriptomic gene expression analysis. However, the study of gene expression via real-time reverse transcription quantitative polymerase chain reaction (RT-qPCR) requires identification of stably expressed reference genes for accurate normalisation. This study describes the evaluation and identification of stable reference genes in the livers from Control Nile rats as well as those supplemented with Water-Soluble Palm Fruit Extract, which has been previously shown to attenuate T2DM in this animal model. Seven genes identified as having stable expression in RNA-Sequencing transcriptome analysis were chosen for verification using real-time RT-qPCR. Six commonly used reference genes from previous literature and two genes from a previous microarray gene expression study in Nile rats were also evaluated. The expression data of these 15 candidate reference genes were analysed using the RefFinder software which incorporated analyses performed by various algorithms. The Hpd, Pnpla6 and Vpp2 genes were identified as the most stable across the 36 samples tested. Their applicability was demonstrated through the normalisation of the gene expression profiles of two target genes, Cela1 and Lepr. In conclusion, three novel reference genes which can be used for robust normalisation of real-time RT-qPCR data were identified, thereby facilitating future hepatic gene expression studies in the Nile rat.
  8. Fulltext Neurodevelopmental outcome of Malaysian very low birth weight infants: predictive value of cranial ultrasound appearances
    Ong LC, Boo NY, Chandran V, Zulfiqar A, Zamratol SM, Allison L, et al.
    Singapore Med J, 1997 Mar;38(3):108-11.
    PMID: 9269376
    The aim of the study was to determine the predictive value of cranial ultrasound scans done in the neonatal period for neurodevelopmental outcome of the Malaysian very low birthweight (VLBW, < 1500 grams) infants assessed at 12 months of corrected age. Of the 101 infants studied, 68 (67.3%) were neurodevelopmentally normal at one year of age, 18 (17.8%) had major and 15 (14.9%) had minor neurodevelopmental impairment. Neurodevelopmental outcome was normal in 66/88 (75.0%) infants who did not have severe intraventricular haemorrhage (IVH) or periventricular intraparenchymal echo densities (PVE) in the first week of life, and in 57/73 (78.1%) with uncomplicated scans at discharge. In contrast, 11/13 (84.6%) with parenchymal echo densities or severe intraventricular bleed in the early neonatal period and 17/28 (60.7%) with complicated scans at discharge had adverse sequelae. There was a significant association between lesions seen on cranial ultrasound in the neonatal period and subsequent neurodevelopmental impairment. Late neonatal ultrasound scans appear to be a better predictor of short-term neurodevelopmental outcome than early scans.
  9. Fulltext Awareness of cervical cancer and HPV vaccination and its affordability among rural folks in Penang Malaysia
    Khoo CL, Teoh S, Rashid AK, Zakaria UU, Mansor S, Salleh FN, et al.
    Asian Pac J Cancer Prev, 2011;12(6):1429-33.
    PMID: 22126476
    INTRODUCTION: As the second most common cancer in women worldwide, cervical cancer causes major health and economic burdens. Recent introduction of HPV immunization program locally has been encouraging but vaccine uptake remains poor. In addition, no study has been conducted to explore the people' s awareness and knowledge on cervical cancer, HPV and its vaccine in a rural setting in Malaysia after the inception of the HPV vaccination program.
    OBJECTIVE: This study was conducted to determine the awareness of cervical cancer, HPV vaccination and its affordability among people in a rural area in Malaysia.

    METHOD: A cross-sectional study was conducted among 116 participants in a village in Penang. All consenting female villagers aged 13 years and above, and males who were married were interviewed using a questionnaire.
    RESULTS: Most participants (88.8%) had heard of cervical cancer, however only 29.3% and 42.2% of them had heard of HPV and HPV vaccination respectively. Only 5.2% knew the actual market price for the vaccine. They were willing to pay an average of RM 96.7 (USD $27.7) for the full course of vaccination if it is not given to them for free, whereas the market price is RM1200 (USD $342.85).
    CONCLUSION: Awareness among the Malaysian population in a rural setting on HPV and HPV vaccination is low. Educating the public on the infection can help control the illness. Cost of the HPV vaccine is a serious barrier to the success of the vaccination program in Malaysia.
  10. Tocotrienol rich fraction (TRF) supplementation protects against oxidative DNA damage and improves cognitive functions in Wistar rats
    Taridi NM, Yahaya MF, Teoh SL, Latiff AA, Ngah WZ, Das S, et al.
    Clin Ter, 2011;162(2):93-8.
    PMID: 21533313
    Oxidative stress is caused by imbalance between the productions of reactive oxygen species (ROS) and antioxidant defense mechanisms. Palm oil antioxidants such as tocotrienol rich fraction (TRF) is known to have neuroprotective effects on neurones by acting against free radical induced neuronal cell death. This study was undertaken to elucidate the effect of TRF on oxidative DNA damage and cognitive functions in experimental rats.
  11. TRANSCRIPTOMIC ANALYSIS OF GRACILARIA CHANGII (RHODOPHYTA) IN RESPONSE TO HYPER- AND HYPOOSMOTIC STRESSES(1)
    Teo SS, Ho CL, Teoh S, Rahim RA, Phang SM
    J Phycol, 2009 Oct;45(5):1093-9.
    PMID: 27032354 DOI: 10.1111/j.1529-8817.2009.00724.x
    Osmotic stress is one of the most significant natural abiotic stresses that occur in the intertidal zones. Seaweeds may physiologically acclimate to changing osmolarity by altering their transcriptome. Here, we investigated the transcriptomic changes of Gracilaria changii (B. M. Xia et I. A. Abbott) I. A. Abbott, J. Zhang et B. M. Xia in response to hyper- and hypoosmotic stresses using a cDNA microarray approach. Microarray analysis revealed that 199 and 200 genes from ∼3,300 genes examined were up- and down-regulated by >2-fold in seaweed samples treated at 50 parts per thousand (ppt) artificial seawater (ASW) compared with those at 30 ppt ASW, respectively. The number of genes that were up- and down-regulated by >2-fold in seaweed samples treated at 10 ppt ASW compared with those at 30 ppt ASW were 154 and 187, respectively. A majority of these genes were only differentially expressed under hyper- or hypoosmotic conditions, whereas 67 transcripts were affected by both stresses. The findings of this study have shed light on the expression profiles of many transcripts during the acclimation of G. changii to hyperosmotic and hypoosmotic conditions. This information may assist in the prioritization of genes to be examined in future studies.
  12. Higher division of the tibial nerve in the leg: gross anatomical study with clinical implications
    Norzana AG, Farihah HS, Fairus A, Teoh SL, Nur AK, Faizah O, et al.
    Clin Ter, 2013;164(1):1-3.
    PMID: 23455733 DOI: 10.7417/CT.2013.1501
    Tibial nerve is a branch of the sciatic nerve and it is the main nerve innervating the muscles of the back of the leg. The tibial nerve divides into medial and lateral plantar nerves. The level of division may be important for surgical purpose. The main aim of the present study was to observe the exact level of division of the tibial nerve and discuss its clinical implications.
  13. Relationship between head growth and neurodevelopmental outcome of Malaysian very low birthweight infants during the 1st year of life
    Ong LC, Boo NY, Chandran V, Zamratol SM, Allison L, Teoh SL, et al.
    Ann Trop Paediatr, 1997 Sep;17(3):209-16.
    PMID: 9425375
    A prospective study was carried out to (i) compare head growth patterns of 103 very low birthweight (VLBW, < 1500 g) Malaysian infants and 98 normal birthweight (NBW, 2500- < 4500 g) controls during the 1st year of life; and (ii) examine the relationship between neurodevelopmental outcome at 1 year of age and occipito-frontal head circumferences (OFC) at birth and at 1 year of age in VLBW babies. When compared with those of NBW infants at birth, mid-infancy and 1 year of age, the mean OFC ratios (observed/expected OFC at 50th percentile) of VLBW infants were significantly lower (p < 0.001). Small-for-gestational-age (SGA) VLBW babies had significantly lower mean OFC ratios than their appropriate-for-gestational-age (AGA) VLBW counterparts at birth (p < 0.001), but this difference was no longer seen at mid-infancy or at 1 year of age. Logistic regression analysis showed that abnormal late neonatal cranial ultrasound findings (odds ratio 8.5, 95% confidence interval 4.12-22.07; p < 0.001) and each additional day of oxygen therapy (odds ratio 1.15, 95% confidence interval 1.00-4.45; p = 0.045) were significant risk factors associated with neurodevelopmental disability at 1 year of age, while mean OFC ratios at birth or at 1 year of age were not. Poor postnatal head growth per se did not predict disability, but probably reflected the consequences of "brain injury" as evidenced by abnormal brain scans.
  14. Duration of oxygen therapy and exchange transfusion as risk factors associated with retinopathy of prematurity in very low birthweight infants
    Teoh SL, Boo NY, Ong LC, Nyein MK, Lye MS, Au MK
    Eye (Lond), 1995;9 ( Pt 6):733-7.
    PMID: 8849541
    One hundred and thirteen consecutive infants with a very low birthweight of less than 1500 g were followed prospectively for 6 months to determine the incidence of retinopathy of prematurity (ROP) and associated risk factors. Of this group, 36 (31.9%) infants developed ROP (13 infants had stage 1 ROP, nine had stage 2, six had stage 3, six had stage 4, and two had cicatricial stage ROP). Stepwise logistic regression analysis of various potential risk factors (birthweight, gestation, duration of oxygen therapy, duration of ventilation, highest documented PaO2 and exchange transfusion) showed that only two risk factors were significantly associated with the development of ROP. These risk factors were: the duration of oxygen therapy (p = 0.0005) and exchange transfusion during the neonatal period (odds ratio 5.754, 95% confidence interval 1.002 to 32.997, p = 0.049). The equation of the regression model is: log (odds of developing ROP) = -0.8395 + 0.1447 (OXY)- 0.8750 (ET), where OXY is the duration of oxygen therapy in days, ET = -1 when there was a history of exchange transfusion, and ET = 1 when there was no history of exchange transfusion.
  15. Comparison of morbidities in very low birthweight and normal birthweight infants during the first year of life in a developing country
    Boo NY, Ong LC, Lye MS, Chandran V, Teoh SL, Zamratol S, et al.
    J Paediatr Child Health, 1996 Oct;32(5):439-44.
    PMID: 8933407
    OBJECTIVE: To compare the morbidities in the very low birthweight (VLBW; < 1500 g) and normal birthweight (NBW; > or = 2500 g) Malaysian infants during the first year of life.

    METHODOLOGY: Prospective observational cohort study of consecutive surviving VLBW infants and randomly sampled NBW infants born in the Kuala Lumpur Maternity Hospital between 1 December 1989 and 31 December 1992. Infants were followed up regularly during the first year of life, after correction for prematurity.

    RESULTS: Compared with NBW infants (n = 106), VLBW infants (n = 127) had significantly higher risk of failure to thrive (odds ratio [OR] = 8.0, 95% confidence intervals [CI]: 1.1 to 354.3), wheezing (OR = 3.7, 95% CI: 1.6 to 9.3), rehospitalization (OR = 2.3, 95% CI: 1.1 to 5.0), cerebral palsy (OR = 8.6, 95% CI: 2.0 to 77.6), neurosensory hearing loss (OR = 12.0, 95% CI: 1.7 to 513.6) and visual loss (7.9 vs 0%, P = 0.002). The mean mental developmental index (MDI) and mean psychomotor developmental index (PDI) at 1 year of age were significantly lower among VLBW infants (MDI 99 [SD = 28], PDI 89 [SD = 25]) than NBW infants (MDI 106 [SD = 18], PDI 101 [SD = 18]) (95% CI for difference between means being MDI: -14.1 to -1.7; and PDI: -17.6 to -6.0). Logistic regression analysis showed that among VLBW infants: (i) male sex, Malay ethnicity and bronchopulmonary dysplasia were significant risk factors associated with wheezing; (ii) longer duration of oxygen therapy during the neonatal period, seizures after the post-neonatal period and wheezing were significant risk factors associated with rehospitalization; and (iii) longer duration of oxygen therapy during the neonatal period was a significant risk factor associated with adverse neurodevelopmental outcome during the first year of life.

    CONCLUSIONS: Compared with NBW infants, VLBW Malaysian infants had significantly higher risks of physical and neuro-developmental morbidities.

  16. Termination of pregnancy in cases of intrauterine fetal death, missed abortion, molar and anencephalic pregnancy with intramuscular administration of 2a 2b dihomo 15(S) 15 methyl PGF2 alpha methyl ester--a multicentre study
    Karim SM, Ratnam SS, Hutabarat H, Hanafiah J, Simanjuntak P, Teoh SK, et al.
    Ann Acad Med Singap, 1982 Oct;11(4):508-12.
    PMID: 7165272
    2a 2b dihomo 15(S) 15 methyl PGF2 alpha methyl ester (dihomo 15 me PGF2 alpha) in intramuscular doses of 0.5 mg 8 hourly was used in 631 patients with abnormal intrauterine pregnancy comprising 282 cases of intrauterine fetal death, 233 cases of missed abortion, 34 and 82 cases respectively anencephalic and molar pregnancies. The study was carried out as a collaborative project between the University Departments of Obstetrics and Gynaecology in Singapore (Singapore), Medan (Indonesia) and Kuala Lumpur (Malaysia) during the period June 1974 and November 1979. Six hundred patients (95.1%) aborted or delivered in a mean time of 11.3 hours (S.D. +/- 7.0) with an average of 1.8 injections of the prostaglandin analogue per patient. Side effects included vomiting (23.6%; mean 0.45 episodes per patient), diarrhoea (44.4%; mean 1.00 episode per patient), cold and shivering (11.9%) and pyrexia (12.4%). One patient sustained a cervical laceration which did not require repair. There were no complications.
  17. Profiling the transcriptome of Gracilaria changii (Rhodophyta) in response to light deprivation
    Ho CL, Teoh S, Teo SS, Rahim RA, Phang SM
    Mar Biotechnol (NY), 2009 Jul-Aug;11(4):513-9.
    PMID: 19043658 DOI: 10.1007/s10126-008-9166-x
    Light regulates photosynthesis, growth and reproduction, yield and properties of phycocolloids, and starch contents in seaweeds. Despite its importance as an environmental cue that regulates many developmental, physiological, and biochemical processes, the network of genes involved during light deprivation are obscure. In this study, we profiled the transcriptome of Gracilaria changii at two different irradiance levels using a cDNA microarray containing more than 3,000 cDNA probes. Microarray analysis revealed that 93 and 105 genes were up- and down-regulated more than 3-fold under light deprivation, respectively. However, only 50% of the transcripts have significant matches to the nonredundant peptide sequences in the database. The transcripts that accumulated under light deprivation include vanadium chloroperoxidase, thioredoxin, ferredoxin component, and reduced nicotinamide adenine dinucleotide dehydrogenase. Among the genes that were down-regulated under light deprivation were genes encoding light harvesting protein, light harvesting complex I, phycobilisome 7.8 kDa linker polypeptide, low molecular weight early light-inducible protein, and vanadium bromoperoxidase. Our findings also provided important clues to the functions of many unknown sequences that could not be annotated using sequence comparison.
  18. Fulltext Whole-genome comparative analysis of Malaysian Burkholderia pseudomallei clinical isolates
    Ghazali AK, Eng SA, Khoo JS, Teoh S, Hoh CC, Nathan S
    Microb Genom, 2021 02;7(2).
    PMID: 33565959 DOI: 10.1099/mgen.0.000527
    Burkholderia pseudomallei, a soil-dwelling Gram-negative bacterium, is the causative agent of the endemic tropical disease melioidosis. Clinical manifestations of B. pseudomallei infection range from acute or chronic localized infection in a single organ to fulminant septicaemia in multiple organs. The diverse clinical manifestations are attributed to various factors, including the genome plasticity across B. pseudomallei strains. We previously characterized B. pseudomallei strains isolated in Malaysia and noted different levels of virulence in model hosts. We hypothesized that the difference in virulence might be a result of variance at the genome level. In this study, we sequenced and assembled four Malaysian clinical B. pseudomallei isolates, UKMR15, UKMPMC2000, UKMD286 and UKMH10. Phylogenomic analysis showed that Malaysian subclades emerged from the Asian subclade, suggesting that the Malaysian strains originated from the Asian region. Interestingly, the low-virulence strain, UKMH10, was the most distantly related compared to the other Malaysian isolates. Genomic island (GI) prediction analysis identified a new island of 23 kb, GI9c, which is present in B. pseudomallei and Burkholderia mallei, but not Burkholderia thailandensis. Genes encoding known B. pseudomallei virulence factors were present across all four genomes, but comparative analysis of the total gene content across the Malaysian strains identified 104 genes that are absent in UKMH10. We propose that these genes may encode novel virulence factors, which may explain the reduced virulence of this strain. Further investigation on the identity and role of these 104 proteins may aid in understanding B. pseudomallei pathogenicity to guide the design of new therapeutics for treating melioidosis.
  19. Genital infections with chlamydia trachomatis
    Ngeow YF, Ong SB, Thong ML, Teoh SK, Omar R, Low BT
    Med J Malaysia, 1979 Sep;34(1):65-70.
    PMID: 542157
  20. pSTAT3 and MYC in Epstein-Barr virus-positive diffuse large B-cell lymphoma
    Teoh SH, Khoo JJ, Abdul Salam DSD, Peh SC, Cheah SC
    Malays J Pathol, 2019 Dec;41(3):273-281.
    PMID: 31901912
    INTRODUCTION: Epstein-Barr Virus (EBV) is associated with several B-cell non-Hodgkin's lymphoma (NHL), but the role of EBV in diffuse large B-cell lymphoma (DLBCL) is poorly defined. Several studies indicated the expression of phosphorylated STAT3 (pSTAT3) is predominant in EBV(+)- DLBCL, of which its activated form can promote the downstream oncogenes expression such as c-MYC. c-MYC gene rearrangements are frequently found in aggressive lymphoma with inferior prognosis. Furthermore, EBV is a co-factor of MYC dysregulation. JAK1/STAT3 could be the downstream pathway of EBV and deregulates MYC. To confirm the involvement of EBV in JAK1/ STAT3 activation and MYC deregulation, association of EBV, pSTAT3 and MYC in EBV(+)- DLBCL cases were studied. The presence of pSTAT3 and its upstream proteins: pJAK1 is identify to delineate the role of EBV in JAK1/STAT3 pathway.

    MATERIALS AND METHODS: 51 cases of DLBCL paraffin-embedded tissue samples were retrieved from a single private hospital in Kuala Lumpur, Malaysia. EBER-ISH was performed to identify the EBV expression; ten EBV(+)-DLBCL cases subjected to immunohistochemistry for LMP1, pJAK1, pSTAT3 and MYC; FISH assay for c-MYC gene rearrangement.

    RESULTS: Among 10 cases of EBV(+)-DLBCL, 90% were non-GCB subtype (p=0.011), 88.9% expressed LMP1. 40% EBV(+)-DLBCL had pJAK1 expression.

    CONCLUSION: 66.7% EBV(+)-DLBCL showed the positivity of pSTAT3, which implies the involvement of EBV in constitutive JAK/STAT pathway. 44.5% EBV(+)-DLBCL have co-expression of pSTAT3 and MYC, but all EBV(+)-DLBCL was absence with c-MYC gene rearrangement. The finding of clinical samples might shed lights to the lymphomagenesis of EBV associated with non-GCB subtypes, and the potential therapy for pSTAT3-mediated pathway.

Related Terms
Filters
Contact Us

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

External Links