Browse publications by year: 2003

  1. Cheah PL, Looi LM, Nazarina AR, Goh KL, Rosmawati M, Vijeyasingam R
    Malays J Pathol, 2003 Jun;25(1):37-43.
    PMID: 16196376
    A study was conducted at the Department of Pathology, University of Malaya Medical Centre, Kuala Lumpur into the histological type (WHO classification), grade (modified Edmondson and Steiner's grading system), mitotic rate, bile production, hyaline globule and Mallory hyaline formation of 52 cases of hepatocellular carcinoma (HCC) diagnosed during a 13-year period between 1st January 1990 to 31st December 2002. In addition, associated cirrhosis, dysplasia (large liver cell dysplasia: LLCD and small liver cell dysplasia: SLCD) and microvascular permeation were also looked for whenever the situation permitted. The patients' ages ranged from 21-years to 85-years (mean = 58.7 years) with a predilection for males and Chinese. Histologically, majority (73.1%) of the tumours demonstrated a trabecular pattern of growth. The bulk (73%) of the tumours were either of grade II or III differentiation. Mitotic activity ranged between 0-100/10 high power fields (hpf) with a mean of 22.2/10 hpf. Bile was noted in 25%, hyaline globules 17.3% and Mallory bodies in one case. Concomitant cirrhosis was present in 73.5%. 73.5% of the cases had associated LLCD. 5 with LLCD also showed SLCD. Microvascular permeation was shown in 76.2% of cases. On comparison with findings from other studies, no major difference seems to exist between the histological characteristics of our HCC cases and that of other populations.
    MeSH terms: Adult; Aged; Aged, 80 and over; Female; Carcinoma, Hepatocellular/epidemiology*; Carcinoma, Hepatocellular/pathology*; Humans; Liver Neoplasms/epidemiology*; Liver Neoplasms/pathology*; Malaysia/epidemiology; Male; Middle Aged
  2. Karim N, Pallesen G
    Malays J Pathol, 2003 Jun;25(1):45-7.
    PMID: 16196377
    Epstein-Barr virus (EBV) has consistently been detected in the tumour cells of nasopharyngeal carcinoma and lymphoepithelial-like carcinoma of the salivary glands, and have occasionally been found in similar tumours at other sites. Moreover, recent studies from various parts of the world including the Orient have shown about 10% of gastric carcinomas to be EBV-associated. We studied 50 gastric carcinomas from Malaysia to investigate its association with EBV in the Malaysian population. They comprised 37 intestinal and 13 diffuse type carcinomas from 32 male and 18 female patients, age range from 29 to 86 years with an ethnic distribution of Malay: Chinese: Indian with the ratio of 4: 27: 19. EBV gene and gene-expression were examined in sections of formalin-fixed, paraffin-embedded tissue using commercially available probes for detecting EBV encoded RNAs (EBERs) by in situ hybridization and monoclonal antibodies to EBV latent membrane protein-1 (LMP-1) by standard immunohistochemistry. Five of 50 gastric carcinomas showed EBER intranuclear positivity in all tumour cells but no cases expressed LMP-1. The EBV-associated cases were classified as intestinal type in 4 and diffuse type in one case and all were histologically unremarkable. EBV-positive tumours were found in 3 Chinese and 2 Indian patients with none in the small Malay group. Four EBV-positive tumours were in male patients, with age-range of 65 to 86 years. We conclude that our findings of about 10% of Malaysian gastric carcinomas being EBV-associated is in line with the results from other parts of the world and from other ethnic groups.
    MeSH terms: Adult; Aged; Aged, 80 and over; Herpesvirus 4, Human/genetics*; Female; Humans; Immunohistochemistry; Malaysia; Male; Middle Aged; RNA, Messenger/analysis; RNA, Viral/analysis; Stomach Neoplasms/virology*; Tumor Virus Infections/pathology; Tumor Virus Infections/virology*; Viral Matrix Proteins/metabolism; In Situ Hybridization; Epstein-Barr Virus Infections/pathology; Epstein-Barr Virus Infections/virology*
  3. Chua KB, Devi S, Hooi PS, Chong KH, Phua KL, Mak JW
    Malays J Pathol, 2003 Jun;25(1):49-56.
    PMID: 16196378
    An in-house prepared M. furfur antigen was used to carry out a seroprevalence study in an urban population in Malaysia by indirect immunofluorescence assay. Of the 800 serum samples from all ages screened, 738 samples were positive for M. furfur specific IgG, giving an overall seropositive rate of 92.3%. There was no significant difference in the seropositive rates among the different gender group and races. However, there was a statistical significant difference in the seropositive rate among different age groups with a lower rate (73%) for the age group 5 years old and below, which increased rapidly to 99% for the 16 to 20 years old age group but declined slightly for the oldest age group. The degree of seropositivity, which semi-quantitatively reflect the anti-M. furfur specific IgG titre, did not show any significant difference among the gender and racial groups. On the other hand, there was a significant difference in the degree of seropositivity among the various age groups, with the 16 to 20 years old age group having the highest antibody titre and the extreme of age groups having the lower antibody titre.
    MeSH terms: Adolescent; Adult; Age Factors; Animals; Antibodies, Fungal/blood*; Child; Child, Preschool; Dermatomycoses/blood*; Dermatomycoses/immunology*; Female; Humans; Immunoglobulin G/blood; Infant; Malassezia/immunology; Malaysia; Male; Middle Aged; Sex Factors; Urban Population*; Seroepidemiologic Studies
  4. Noraidah M, Jasmi AY
    Malays J Pathol, 2003 Jun;25(1):57-61.
    PMID: 16196379
    Malignant melanoma involving the gastrointestinal tract is diagnosed antemortem in only a small percentage of patients with the disease. Presenting symptoms are often non-specific, causing a diagnostic problem. The vast majority of such melanomas are metastatic from a cutaneous primary, however there is evidence that the tumour can arise de novo in the gastrointestinal system. We report a 74-year-old man with malignant melanoma with an unusual presentation simulating a symptomatic gastric ulcer. He presented with epigastric pain, haematemesis and melaena. Explorative laparotomy revealed a large ulcerated tumour with several pigmented satellite nodules in the proximal stomach, multiple ileal nodules and widespread nodal and liver metastases. Proximal gastrectomy and limited small bowel resection was performed. Histology revealed the tumour to be composed of nests of epithelioid cells with melanin pigment. The tumour cells showed immunohistochemical positivity for S100 protein and HMB45 antibodies. This report emphasizes that melanoma should be a diagnostic consideration in patients with gastric ulcer.
    MeSH terms: Aged; Antigens, Neoplasm; Diagnosis, Differential; Gastrointestinal Neoplasms/complications; Gastrointestinal Neoplasms/pathology*; Humans; Immunohistochemistry; Male; Melanoma/complications; Melanoma/pathology; Neoplasm Proteins/metabolism; S100 Proteins/metabolism; Sarcoma/pathology; Stomach Ulcer/etiology; Stomach Ulcer/pathology*; Melanoma-Specific Antigens
  5. Jayaram G, Yaccob R, Liam CK
    Malays J Pathol, 2003 Jun;25(1):63-8.
    PMID: 16196380
    Mucinous carcinoma of the lung, also known as colloid carcinoma, is an uncommon tumour that is rarely encountered in fine needle aspiration (FNA) cytological practice. A 64-year-old Chinese male presenting with blood stained sputum and hoarseness of voice was discovered to have a 3 cm sized mass in the left lung. Neither bronchial washings nor transthoracic FNA yielded positive results at this stage. Six months later the patient returned to the hospital with a larger tumour and mediastinal lymphadenopathy. Transbronchial lymph node FNA, reported as negative for malignancy showed normal, hyperplastic and mildly atypical bronchial epithelial cells as well as a few single cells and extracellular mucin. Transthoracic FNA of the lung lesion performed under computed tomographic guidance showed characteristic cytological features of this tumour, establishing the diagnosis.
    MeSH terms: Adenocarcinoma, Mucinous/pathology*; Adenocarcinoma, Mucinous/surgery; Humans; Lung Neoplasms/pathology*; Lung Neoplasms/surgery; Male; Middle Aged; Mucins/metabolism; Biopsy, Fine-Needle*
  6. Khoo JJ, Choon SE
    Malays J Pathol, 2003 Jun;25(1):73-8.
    PMID: 16196382
    Extramammary Paget's disease (EMPD) is a rare disorder and may be found in the vulva, scrotum, penile area, perianal region and the groin. Frequently, it is associated with an underlying regional neoplasm or internal malignancy. We report 2 cases of EMPD; one involving the scrotal area and the other the vulva. Both were elderly patients who presented to the dermatologists with chronic eczematous lesions in the perineum that did not respond to topical treatment. Skin biopsies confirmed extramammary Paget's disease. Investigations for internal malignancies were negative. However, one of the patients defaulted treatment before surgery. The other patient had two excision surgeries with skin grafting to try to achieve tumour free margins. A long term follow-up was planned for him to look for recurrences. These cases emphasise that EMPD can mimic exudative dermatitis and present as a chronic non-healing lesion in the perineum for many years. Clinicians should have a high index of suspicion to pick up the disease early by biopsy. Various immunohistochemical markers not only can help differentiate other histological diagnoses but also help predict the presence of underlying malignancies. Management of EMPD included thorough search for occult or underlying malignancy followed by complete excision surgery with intraoperative frozen sections. Even then, recurrences are high for this disease and long term follow-up is advocated.
    MeSH terms: Aged; Aged, 80 and over; Dermatitis/pathology; Diagnosis, Differential; Female; Genital Neoplasms, Male/pathology*; Humans; Male; Paget Disease, Extramammary/pathology*; Perineum/pathology*; Scrotum/pathology; Skin Neoplasms/pathology*; Vulvar Neoplasms/pathology
  7. Cavaljuga S, Faulde M, Scharninghausen JJ
    Bosn J Basic Med Sci, 2003 May;3(2):46-55.
    PMID: 16223373
    At this moment, public health authorities, physicians and scientists around the world are struggling to cope with a severe and rapidly spreading new disease in humans called severe acute respiratory syndrome, or SARS. According to World Health Organisation (WHO) this appears to be the first severe and easily transmissible new disease to emerge in the 21st century. Though much about the disease remains poorly understood, including the details of the causative virus, we do know that it has features that allow it to spread rapidly along international air travel routes. As of 10 May 2003, a cumulative 7296 probable SARS cases with 526 deaths have been reported from 30 countries on three continents (WHO, ProMED). In the past week, more than 1000 new probable cases and 96 deaths were reported globally. This represents an increase of 119 new cases and 8 new deaths compared with 9 May 2003 (China (85), Taiwan (23), and Hong Kong (7) represented the overwhelming majority, with one additional case each reported from France, Malaysia, Singapore, and the United States). Only in China, as of 10 May 2003 (WHO) total of 4884 with 235 deaths have been reported. Some outbreaks have reassuring features.
    MeSH terms: China; Communicable Diseases; Disease Outbreaks; France; Hong Kong; Humans; Malaysia; Public Health; Singapore; Taiwan; United States; World Health Organization; Severe Acute Respiratory Syndrome; Air Travel
  8. Soo EL, Salleh AB, Basri M, Zaliha Raja Abdul Rahman RN, Kamaruddin K
    J Biosci Bioeng, 2003;95(4):361-7.
    PMID: 16233420
    The feasibility of using palm oil fractions as cheap and abundant sources of raw material for the synthesis of amino acid surfactants was investigated. Of a number of enzymes screened, the best results were obtained with the immobilized enzyme, Lipozyme. The effects of temperature, solvent, incubation period, fatty substrate/amino acid molar ratio, enzyme amount, and water removal on the reactions were analyzed and compared to those on reactions with free fatty acids and pure triglycerides as fatty substrates. All reactions were most efficient when carried out at high temperatures (70-80 degrees C) in hexane as a solvent. However, while reactions with free fatty acids proceeded better when a slight excess of the free fatty acids over the amino acids was used, reactions with triglycerides and palm oil fractions were best performed at equimolar ratios. Also, the addition of molecular sieves slightly enhanced reactions with free fatty acids but adversely affected reactions with triglycerides and palm oil fractions. Although reactions with palm oil fractions took longer (6 d) to reach equilibrium compared to reactions with free fatty acids (4 d) and pure triglycerides (4 d), better yields were obtained. Such lipase-catalyzed transacylation of palm oil fractions with amino acids is potentially useful in the production of mixed medium- to long-chain surfactants for specific applications.
    MeSH terms: Amino Acids; Catalysis; Enzymes, Immobilized; Fatty Acids, Nonesterified; Feasibility Studies; Hexanes; Lipase; Solvents; Surface-Active Agents; Temperature; Triglycerides; Water
  9. Khoon CC
    New Solut, 2003;13(1):87-105.
    PMID: 17208722
    In Malaysia, the shifting balance between market and state has many nuances. Never a significant welfare state in the usual mold, the Malaysian state nonetheless has been a dominant social and economic presence dictated by its affirmative action-type policies, which eventually metamorphosed into state-led indigenous capitalism. Privatisation is also intimately linked with emergence of an indigenous bourgeoisie with favored access to the vast accumulation of state assets and prerogatives. Internationally, it is conditioned by the fluid relationships of converging alliances and contested compromise with international capital, including transnational health services industries. As part of its vision of a maturing, diversified economy, the Malaysian government is fostering a private-sector advanced health care industry to cater to local demand and also aimed at regional and international patrons. The assumption is that, as disposable incomes increase, a market for such services is emerging and citizens can increasingly shoulder their own health care costs. The government would remain the provider for the indigent. But the key assumption remains: the growth trajectory will see the emergence of markets for an increasingly affluent middle class. Importantly, the health care and social services market would be dramatically expanded as the downsizing of public-sector health care proceeds amid a general retreat of government from its provider and financing roles.
  10. Ong LM, Lim TO, Hooi LS, Morad Z, Tan PC, Wong HS, et al.
    Perit Dial Int, 2003 Dec;23 Suppl 2:S139-43.
    PMID: 17986534
    OBJECTIVE: In the present study, we undertook to establish therapeutic equivalence with respect to peritonitis and technique failure between the Carex disconnect system (B. Braun Carex, Mirandola, Italy) and the standard Ultra system (Baxter Healthcare, Tokyo, Japan) in patients on continuous ambulatory peritoneal dialysis (CAPD).

    DESIGN: This multicenter, parallel group, randomized controlled trial involved 363 prevalent CAPD patients from 8 centers. The primary endpoint was peritonitis rate; secondary endpoints were technique failure and technical problems encountered. The duration of the evaluation was 1 year.

    RESULTS: The risk of peritonitis on Carex varied between the centers. We found a significant treatment-center interaction effect (likelihood ratio test: p = 0.03). The incidence rate ratio (IRR) of peritonitis on Carex as compared with Ultra ranged from 0.4 to 7.2. In two centers, Carex was inferior to Ultra with regard to peritonitis; but, in five centers, the results were inconclusive. Equivalence was not demonstrated in any center. The overall rate of peritonitis in the Carex group was twice that in the Ultra group [IRR: 2.18; 95% confidence interval (CI): 1.51 to 3.14]. Technique failure and technical problems were more common with the Carex system. Technique failure rate at 1 year was 44% in the Carex group and 22% in the Ultra group.

    CONCLUSIONS: Equivalence between the Carex disconnect system and the Ultra disconnect system could not be demonstrated. The risk of peritonitis on Carex varied significantly between centers.

    MeSH terms: Adolescent; Adult; Aged; Aged, 80 and over; Child; Female; Humans; Male; Middle Aged; Peritoneal Dialysis, Continuous Ambulatory/instrumentation*; Peritonitis/epidemiology*; Young Adult
  11. Shanmugavadivoo K, Shaariah W
    Perit Dial Int, 2003 Dec;23 Suppl 2:S192-5.
    PMID: 17986546
    BACKGROUND: Reproductive health issues in women with end-stage renal disease (ESRD) are often neglected. Data on these issues are also limited.

    PURPOSE: We set out to describe the reproductive health issues in women being treated with either hemodialysis (HD) or continuous ambulatory peritoneal dialysis (CAPD).

    PATIENTS AND METHODS: All adult female patients on chronic dialysis in Hospital Seremban from January 1991 to December 2001 were included in our study. Patients (or their spouses or children) were interviewed regarding the menstrual status of the patient, gynecologic screening tests administered to the patient, and the patient's use of hormone replacement therapy (HRT).

    RESULTS: We recruited 137 women into the study. Of those women, 52.6% were on HD; the rest were on CAPD. Mean age at diagnosis of ESRD was 46.5 +/- 14.1 years (range: 14 - 82 years), and mean duration on dialysis was 33.3 months (range: 2 months - 18 years). Responses about menstrual status were obtained for 118 patients. Of those 118 patients, 55 (46.6%) were postmenopausal at dialysis initiation. Average age at menopause had been 48.5 +/- 4.9 years. Another 19 patients (16.1%) had still been menstruating at dialysis initiation, but subsequently entered menopause. Their average age at menopause had been 45.1 +/- 10.3 years. The remaining 44 patients (37.3%) were still menstruating at an average age of 35.7 years (range: 15 - 49 years). Only 3 of 73 responders were on HRT; 63% had undergone a Pap smear; and 54% had had a breast examination.

    CONCLUSIONS: Patients with ESRD tend to experience premature menopause. Not all dialysis patients are amenorrheic. Despite frequent contact between dialysis patients and hospital staff, gynecologic screening and use of HRT in those patients are still very low.

    MeSH terms: Adolescent; Adult; Aged; Aged, 80 and over; Female; Humans; Middle Aged; Peritoneal Dialysis, Continuous Ambulatory; Retrospective Studies; Young Adult
  12. Tan PC, Morad Z
    Perit Dial Int, 2003 Dec;23 Suppl 2:S206-9.
    PMID: 17986550
    Clinical disciplines in which the nurse plays as pre-eminent a role in total patient care as in peritoneal dialysis (PD) are few. The PD nurse is readily identified by the patient as the principal source of advice on day-to-day aspects of treatment, as a resource manager for supplies of PD disposables and fluids, and as a general counselor for all kinds of advice, including diet, rehabilitation, and medication, among others. The PD nurse is thus the key individual in the PD unit, and most activities involve and revolve around the nursing staff. It is therefore not surprising that most nephrologists pay considerable attention to the selection of PD nurses, particularly in long-term PD programs such as continuous ambulatory peritoneal dialysis (CAPD). The appointment of a PD nurse depends on finding an individual with the right attributes, broad general experience, and appropriate training.
    MeSH terms: Education, Nursing*; Peritoneal Dialysis/nursing*
  13. Fauzi AR, Jeyabalan V, Kong NC, Selvam T
    Saudi J Kidney Dis Transpl, 2003 Apr-Jun;14(2):194-6.
    PMID: 18209446
    Central vein stenosis is usually associated with previous cannulation or trauma to the affected vein. This pathology may present as ipsilateral arm swelling in patients in whom a recent arteriovenous fistula has been prepared for chronic hemodialysis. The presence of central vein stenosis without prior trauma or cannulation is not hitherto reported to the best of our knowledge. We herewith report a patient with end-stage renal disease who was initiated on chronic dialysis using an arteriovenous fistula, who was noted to have central vein stenosis. This was despite her never having had any central vein cannulation or previous known trauma. Venogram confirmed the presence of brachiocephalic vein stenosis. The patient underwent venographic stenting of the involved vein with good success.
    MeSH terms: Arteriovenous Fistula; Catheterization, Central Venous; Constriction, Pathologic; Female; Renal Dialysis; Humans; Kidney Failure, Chronic; Phlebography; Brachiocephalic Veins
  14. Goh WY, Lim CP, Peh KK
    IEEE Trans Neural Netw, 2003;14(2):459-63.
    PMID: 18238031 DOI: 10.1109/TNN.2003.809420
    Applicability of an ensemble of Elman networks with boosting to drug dissolution profile predictions is investigated. Modifications of AdaBoost that enables its use in regression tasks are explained. Two real data sets comprising in vitro dissolution profiles of matrix-controlled-release theophylline pellets are employed to assess the effectiveness of the proposed system. Statistical evaluation and comparison of the results are performed. This work positively demonstrates the potentials of the proposed system for predicting desired drug dissolution characteristics in pharmaceutical product formulation tasks.
  15. Yap PT, Paramesran R, Ong SH
    IEEE Trans Image Process, 2003;12(11):1367-77.
    PMID: 18244694 DOI: 10.1109/TIP.2003.818019
    In this paper, a new set of orthogonal moments based on the discrete classical Krawtchouk polynomials is introduced. The Krawtchouk polynomials are scaled to ensure numerical stability, thus creating a set of weighted Krawtchouk polynomials. The set of proposed Krawtchouk moments is then derived from the weighted Krawtchouk polynomials. The orthogonality of the proposed moments ensures minimal information redundancy. No numerical approximation is involved in deriving the moments, since the weighted Krawtchouk polynomials are discrete. These properties make the Krawtchouk moments well suited as pattern features in the analysis of two-dimensional images. It is shown that the Krawtchouk moments can be employed to extract local features of an image, unlike other orthogonal moments, which generally capture the global features. The computational aspects of the moments using the recursive and symmetry properties are discussed. The theoretical framework is validated by an experiment on image reconstruction using Krawtchouk moments and the results are compared to that of Zernike, pseudo-Zernike, Legendre, and Tchebyscheff moments. Krawtchouk moment invariants are constructed using a linear combination of geometric moment invariants; an object recognition experiment shows Krawtchouk moment invariants perform significantly better than Hu's moment invariants in both noise-free and noisy conditions.
  16. Tan BL, Ali Mohd M
    Talanta, 2003 Nov 4;61(3):385-91.
    PMID: 18969198 DOI: 10.1016/S0039-9140(03)00281-9
    A total of seven pesticides and eight alkylphenols were monitored using this method for the determination of their trace levels in human cord blood. The pesticides are lindane, diazinon, alpha-endosulfan, beta-endosulfan, endosulfan sulfate, chlorpyrifos and endrin; while the alkylphenols are 4-n-butylphenol, 4-n-pentylphenol, 4-n-hexylphenol, 4-t-octylphenol, 4-n-heptylphenol, nonylphenol, 4-n-octylphenol and bisphenol A. The pesticides and alkylphenols in the cord blood samples were extracted with solid phase extraction IST C18 cartridges and analyzed by selected ion monitoring mode using quadrapole detector in Shimadzu QP-5000 gas chromatograph-mass spectrometer. Trace levels of pesticide and alkylphenols in the range of non-detectable to 15.17 ng ml(-1), were detected in the human cord blood samples. This technique of monitoring the levels of endocrine-disruptors in blood samples is consistent, reliable and cost effective while reducing wastage of time and solvents.
    MeSH terms: Lindane; Benzhydryl Compounds; Diazinon; Chlorpyrifos; Endosulfan; Endrin; Fetal Blood; Humans; Pesticides; Phenols; Solvents; Endocrine Disruptors; Solid Phase Extraction
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