Displaying publications 81 - 100 of 115 in total

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  1. Ariffin H, Lim HL
    Pediatr Blood Cancer, 2005 Aug;45(2):229.
    PMID: 15768379
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/diagnosis*
  2. Gill HK, Keoh TS, Dhaliwal JS, Moore S, Kim TS, Hassan R, et al.
    Cancer Genet. Cytogenet., 2005 Jan 15;156(2):129-33.
    PMID: 15642392
    Eighty-eight multi-ethnic Malaysian pediatric acute lymphoblastic leukemia (ALL) patients were screened for the TEL-AML1 rearrangement by reverse transcription-polymerase chain reaction (RT-PCR). Fluorescence in situ hybridization (FISH) was used as an independent screen for 30 cases and to confirm RT-PCR positive cases. Seventeen patients, or 19%, were found to be t(12;21) positive. Ethnically the group comprised 12 Malays, 4 Chinese, and 1 Indian. All patients, including 1 with an unusual blast cell morphology who suffered an early relapse and death, were characteristic TEL-AML1 cases in cell count, age, ALL subset classification, and fusion transcript expressed. This study shows that in Malaysia, TEL-AML1 is found in the same distinct ALL subset and at a similar frequency as in other diverse childhood ALL cohorts.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/genetics*; Precursor Cell Lymphoblastic Leukemia-Lymphoma/pathology
  3. Maha A, Cheong SK, Leong CF, Seow HF
    Objective: Despite much progress in treatment strategies, long term survival of adult ALL is still inferior to that in children. The underlying mechanisms for these differences are largely unknown. Intensification of contemporary therapy has also resulted in many children being over-treated. The action of chemotherapeutic drugs used in the treatment of ALL includes cell cycle dependent agents which are effective on cells that are proliferating. Cell proliferation in haemopoietic cells is controlled by cytokines. Thus, we proposed to study the cell cycle profile of ALL cases and also expression of cytokines to determine their role in affecting treatment outcome in the different age groups.
    Methods: We determined the S-phase fraction from the cell cycle profile by flowcytometry and tested the expressions of cytokine IL-1beta, IL-6, IL-18, IFN-gamma, TNF-alpha and GM-CSF using RT-PCR in de novo ALL cases.
    Results: We found a significantly higher S-phase fraction in samples from children 2-10 years old compared to the older age group (>10 years old) (p=0.001). GM-CSF was found to be expressed in a significantly lower percentage of children compared to adults (p=0.008).
    Conclusion: Our results implied that GM-CSF may have induced cell cycle arrests in adult ALL resulting in a lower percentage of S-phase fraction. This may contribute to the poorer prognosis in adult ALL because non-cycling blasts are less sensitive to some chemotherapeutic drugs.
    Keywords: ALL, S-phase fraction, GM-CSF, age
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma
  4. Leong CF, Kalaichelvi AV, Cheong SK, Hamidah NH, Rahman J, Sivagengei K
    Malays J Pathol, 2004 Dec;26(2):111-6.
    PMID: 16329563
    Myeloperoxidase (MPO) is present in azurophilic granules which appear in the promyelocyte stage of differentiation and is expressed in granulomonocytic cells. MPO is usually detected by cytochemistry. The demonstration of peroxidase in at least 3% of bone marrow blasts defines an acute leukaemia as acute myeloblastic leukaemia (AML). MPO is important in distinguishing acute myeloblastic leukaemia (AML) from acute lymphoblastic leukaemia (ALL). It is difficult to diagnose AML with minimal evidence of myeloid differentiation (AML- M0) by conventional light microscopy. However, these AML-M0 blasts can be detected by monoclonal antibodies. Anti-MPO recognizes the enzymatically inactive precursor forms of MPO. There are a few commercially available monoclonal antibodies against MPO. In this study, we evaluated two monoclonal antibodies against MPO from different commercial sources.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/diagnosis*; Precursor Cell Lymphoblastic Leukemia-Lymphoma/enzymology
  5. Gill HK, Ten SK, Dhaliwal JS, Moore S, Hassan R, Karim FA, et al.
    Malays J Pathol, 2004 Dec;26(2):105-10.
    PMID: 16329562
    An RT-PCR assay detected the t(4;11) translocation in two infants with acute lymphoblastic leukemia (ALL). Case P76 was a 10-month-old, female infant, who presented with a WBC of 137.4 x 10(9)/l and a pre-pre-B ALL immunophenotype. Case P120 was a 6-month-old female infant, with a WBC > 615 x 10(9)/l and a pre-pre-B ALL immunophenotype. RT-PCR of cDNA from both these cases generated a 656 bp and a 542 bp respectively, which sequencing confirmed as t(4;11) fusion transcripts. The primers and conditions selected for this assay are compatible with a one-step multiplex PCR for the main translocations in childhood ALL.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/genetics*; Precursor Cell Lymphoblastic Leukemia-Lymphoma/pathology
  6. Reddy SC, Jackson N
    Acta Ophthalmol Scand, 2004 Feb;82(1):81-5.
    PMID: 14738490
    PURPOSE: To determine the prevalence of retinal changes in newly diagnosed acute leukaemia patients, and to establish the relationship between retinal lesions and haematological parameters in these patients.

    METHODS: A total of 127 patients with acute leukaemia (myeloid and lymphoid), of both genders, aged between 13 and 77 years, were examined by an ophthalmologist for retinal changes using direct/indirect ophthalmoscopy within 2 days of diagnosis before starting chemotherapy.

    RESULTS: Retinal lesions were seen in 62 cases (49%), with intraretinal haemorrhages being the most common lesion (42%). A high white blood cell count was significantly associated with intraretinal haemorrhages (p = 0.04) and white-centred haemorrhages (p = 0.001), while a low platelet count was significantly associated with intraretinal haemorrhages (p = 0.03) in acute myeloid leukaemia patients.

    CONCLUSIONS: A high white blood cell count may be considered as important as a low platelet count in the pathogenesis of leukaemic retinopathy.

    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/blood; Precursor Cell Lymphoblastic Leukemia-Lymphoma/diagnosis*; Precursor Cell Lymphoblastic Leukemia-Lymphoma/drug therapy
  7. Ariffin H, Chen SP, Wong HL, Yeoh A
    Singapore Med J, 2003 Oct;44(10):517-20.
    PMID: 15024455
    In childhood acute lymphoblastic leukaemia (ALL), cytogenetics play an important role in diagnosis, allocation of treatment and prognosis. Conventional cytogenetic analysis, involving mainly karyotyping in our experience, has not been successful in a large proportion of cases due to inadequate metaphase spreads and poor chromosome morphology. Our aim is to develop a highly sensitive and specific method to screen simultaneously for the four most frequent fusion transcripts resulting from specific chromosomal translocations, namely, both the CML- and ALLtype BCR-ABL transcripts of t(9;22), E2A-PBX1 transcript of t(1;19), the MLL-AF4 transcript of t(4;11) and TEL-AML1 (also termed ETV6-CBFA2) of the cryptic t(12;21). A multiplex reverse transcription polymerase chain reaction protocol (RT-PCR) was developed and tested out on archival bone marrow samples and leukaemia cell lines. In all samples with a known translocation detected by cytogenetic techniques, the same translocation was identified by the multiplex-PCR assay. Multiplex RT-PCR assay is an effective, sensitive, accurate and cost-effective diagnostic tool which can improve our ability to accurately and rapidly risk-stratify patients with childhood ALL.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/genetics*
  8. S Abdul Wahid F, Cheong SK, Azman Ali R
    Hosp Med, 2002 Jun;63(6):372-3.
    PMID: 12096671 DOI: 10.12968/hosp.2002.63.6.2011
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/complications*; Precursor Cell Lymphoblastic Leukemia-Lymphoma/diagnosis
  9. Kham SK, Tan PL, Tay AH, Heng CK, Yeoh AE, Quah TC
    J Pediatr Hematol Oncol, 2002 Jun-Jul;24(5):353-9.
    PMID: 12142782
    The purpose of this study was to determine the frequency of thiopurine methyltransferase (TPMT) polymorphisms in a multiracial Asian population and to assess its relevance in the management of childhood acute lymphoblastic leukemia (ALL). Six hundred unrelated cord blood samples from 200 Chinese, Malay, and Indian healthy newborns were collected at the National University Hospital, Singapore; an additional 100 children with ALL were analyzed for five of the commonly reported TPMT variant alleles using polymerase chain reaction/restriction fragment length polymorphism and allele-specific polymerase chain reaction-based assays. In the cord blood study, the TPMT*3C variant was detected in all three ethnic groups; Chinese, Malays, and Indians had allele frequencies of 3%, 2.3%, and 0.8%, respectively. The TPMT*3A variant was found only among the Indians at a low allele frequency of 0.5%. The TPMT*6 variant was found in one Malay sample. Among the children with ALL, two white and one Chinese were heterozygous for the TPMT*3A variant and showed intermediate sensitivity to 6-mercaptopurine during maintenance therapy. Three Chinese patients and one Malay patient were heterozygous for the TPMT*3C variant. Mercaptopurine sensitivity could be validated in only one out of four TPMT*3C heterozygous patients. The overall allele frequency of the TPMT variants in this multiracial population was 2.5%. The TPMT*3C was the most common variant allele; TPMT*3A and TPMT*6 were rare. These results support the feasibility of performing TPMT genotyping in all children diagnosed with acute leukemia to minimize toxicity from thiopurine chemotherapy.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/enzymology*; Precursor Cell Lymphoblastic Leukemia-Lymphoma/ethnology; Precursor Cell Lymphoblastic Leukemia-Lymphoma/genetics*
  10. Menon BS, Wan Maziah WM
    Malays J Pathol, 2001 Jun;23(1):47-8.
    PMID: 16329548
    The aim of this study was to determine the incidence and outcome of herpes zoster hospitalised children with cancer in Kota Baru. It was a retrospective review from January 1994 to December 1998. The diagnosis of herpes zoster was a clinical one. Herpes zoster was diagnosed in 10 of 188 (5%) children with malignancy. The most common malignancy was leukaemia. Nine children were treated with acyclovir. No child developed visceral dissemination and there were no deaths.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/immunology; Precursor Cell Lymphoblastic Leukemia-Lymphoma/epidemiology; Precursor Cell Lymphoblastic Leukemia-Lymphoma/virology*
  11. Ng SM, Lin HP, Ariffin WA, Zainab AK, Lam SK, Chan LL
    J Trop Pediatr, 2000 Dec;46(6):338-43.
    PMID: 11191144
    The presenting features and treatment outcome for 575 Malaysian children (< or = 12 years of age) with newly diagnosed acute lymphoblastic leukemia (ALL), admitted to the University Hospital, Kuala Lumpur, Malaysia between 1 January 1980 and 30 May 1995 were evaluated to determine their prognostic significance. Two-year overall survival was achieved in 67 per cent of all patients and 55 per cent of patients were relapse-free at 2 years. All except 10 patients, with identified French-American-British L3 morphology were treated with the modified Berlin-Frankfurt-Munster 78 treatment protocol. Univariate analyses of failure rate conferred age, sex, white cell count and hemoglobin level as potentially significant prognostic factors. All four presenting features retained their prognostic strength in a multivariate analysis. Race, platelet count, morphological subtype, liver/spleen size, lymphadenopathy, central nervous system and mediastinal mass involvement did not show any significant effect on treatment outcome. The 2-year survival rate was significantly different with regard to age, white cell count and hemoglobin level. However, sex was not significantly related to overall survival. These prognostic factors may have implications on future stratification of risk-adjusted initial treatment in the management of childhood ALL. Our analysis of Malaysian children is similar to what could be predicted based on previous studies in other populations.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/blood; Precursor Cell Lymphoblastic Leukemia-Lymphoma/diagnosis; Precursor Cell Lymphoblastic Leukemia-Lymphoma/drug therapy*; Precursor Cell Lymphoblastic Leukemia-Lymphoma/mortality
  12. Fadilah SAW, Faridah I, Cheong SK
    Med J Malaysia, 2000 Dec;55(4):513-5.
    PMID: 11221167
    The effect of L-asparaginase on the thyroid gland has not been well documented. We report the first two cases of hyperthyroidism associated with thyroid nodule following L-asparaginase therapy for acute lymphoblastic leukemia (ALL). The thyroid function abnormalities were not severe, short-lived and did not require specific therapy.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/drug therapy*
  13. Omar KZ, Ariffin H, Abdullah WA, Chan LL, Lin HP
    Med. Pediatr. Oncol., 2000 May;34(5):377-8.
    PMID: 10797367
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/drug therapy
  14. Ng SM, Ariffin WA, Lin HP, Chan LL, Chin YM
    J Trop Pediatr, 2000 Apr;46(2):73-8.
    PMID: 10822932
    The purpose of the study was to evaluate the incidence of myeloid antigen coexpression and its prognostic significance in childhood acute lymphoblastic leukemia (ALL) in Malaysia. A retrospective study was conducted of all ALL cases (< or = 12 years old) diagnosed and treated in University Hospital, Kuala Lumpur, Malaysia between 1 January 1992 and 30 May 1995, with available immunophenotype data. Presenting features and treatment outcome of 39 B-lineage ALL patients with myeloid antigen coexpression (My+B) were compared with 112 B-lineage ALL patients without myeloid antigen coexpression (My-B) for similarity in demographic, clinical and laboratory features and their treatment outcome. My+B and My-B patients were treated with a uniform treatment protocol. Myeloid antigen coexpression was defined as more than 30% isolated leukemic cells positive for CD13 and/or CD33. The ages at diagnoses ranged from 2 months to 12 years. Median age was 4 years. The incidence of myeloid antigen coexpression was 23 per cent. Univariate analyses showed that presenting features were similar between My+B and My-B with regard to age, sex, race, FAB morphology, white cell count, hemoglobin level, platelet count, liver/spleen size, central nervous system or mediastinal involvement, presence of lymphadenopathy, and proportion of blast cells detected in the marrow. Treatment outcome were not significant between the two groups. The 2-year event free survival was achieved in 44 per cent of My+B and 57 per cent of My-B (p = 0.11). The 2-year overall survival rates were 62 per cent for My+B vs. 77 per cent for My-B (p = 0.08). This study demonstrates that myeloid antigen coexpression is fairly common and constitutes 23 per cent of childhood ALL within the Malaysian population and that it is not an adverse risk factor in childhood ALL.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/diagnosis*; Precursor Cell Lymphoblastic Leukemia-Lymphoma/drug therapy*; Precursor Cell Lymphoblastic Leukemia-Lymphoma/immunology; Precursor Cell Lymphoblastic Leukemia-Lymphoma/mortality
  15. Ariffin H, Ariffin W, Tharam S, Omar A, de Bruyne J, Lin HP
    Singapore Med J, 1999 Aug;40(8):533-6.
    PMID: 10572495
    Candida species is now being increasingly recognised as an important cause of endocarditis especially in immunocompromised patients. A case of Candida albicans endocarditis in a child with acute lymphoblastic leukemia (ALL) is reported. The child did not have a central venous catheter at any time. Treatment consisted of intravenous amphotericin B and fluconazole for 3 weeks followed by oral fluconazole for 2 weeks. No surgical resection was necessary. We highlight here the importance of echocardiography in the management of prolonged febrile neutropenia and discuss the dilemma of continuing chemotherapy in such patients.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/complications*; Precursor Cell Lymphoblastic Leukemia-Lymphoma/diagnosis
  16. Menon BS, Wan Maziah WM, Jackson N, Jamaluddin N, Narazah MY, Dasgupta A, et al.
    Med J Malaysia, 1999 Jun;54(2):283-4.
    PMID: 10972046
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/blood*
  17. Reddy SC, Menon BS
    Acta Ophthalmol Scand, 1998 Dec;76(6):700-3.
    PMID: 9881556
    PURPOSE: To determine the prevalence of ocular manifestations in childhood acute leukaemia at the time of presentation.

    METHODS: Eighty-two children with acute leukaemia were examined for ocular lesions within two days of diagnosis before starting chemotherapy. The detailed ocular examination of both eyes was carried out by the ophthalmologist irrespective of the presence or absence of eye symptoms in all cases.

    RESULTS: Only 3 out of 82 children presented with eye symptoms (3.6%). However, ocular changes were found in 14 children (17%); ten with lymphoblastic and four with myeloid leukaemia. The ocular lesions observed were proptosis, intraretinal haemorrhages, white centered haemorrhages, cotton wool spots, macular haemorrhage, subhyaloid haemorrhage, vitreous haemorrhage, papilloedema, cortical blindness, sixth nerve palsy, and exudative retinal detachment with choroidal infiltration.

    CONCLUSION: In view of the high prevalence of asymptomatic ocular lesions in childhood acute leukaemia, routine ophthalmic examination should be included as a part of evaluation at the time of diagnosis.

    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/complications*; Precursor Cell Lymphoblastic Leukemia-Lymphoma/diagnosis
  18. Indudharan R, Arni T, Myint KK, Jackson N
    J Laryngol Otol, 1998 Jun;112(6):592-4.
    PMID: 9764308
    Extra-nodal non-Hodgkin's lymphoma (NHL) of the pinna has only been reported once in a patient with immunodeficiency. We report an unusual case of lymphoblastic lymphoma in a patient without any immunodeficiency, presenting as an inflammatory lesion of the pinna, which illustrates the need to biopsy any non-healing lesion as soon as possible to ensure that such a treatable malignancy is diagnosed at an early stage.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/pathology*
  19. Menon BS, Dasgupta A, Jackson N
    Pediatr Hematol Oncol, 1998 Mar-Apr;15(2):175-8.
    PMID: 9592844
    This study reviewed the immunophenotyping results of children with acute leukemia in Kelantan, Malaysia. In the 3.5-year period (January 1994 to June 1997), 45 cases were identified. All children were under the age of 12 years and the predominant ethnic group was Malay. Thirty-six cases (80%) were acute lymphoblastic leukemia (ALL) and 9 cases (20%) were acute myeloblastic leukemia (AML). Of the ALL cases, 3% were of B-cell and 22% of T-cell origin, and 96% of the B-lineage ALL were CD10 positive. All the AML cases expressed CD33 and 78% were positive for CD13. The incidence of mixed-lineage leukemias was 13.8% for My+ ALL and 11.1% for Ly+ AML.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma/ethnology; Precursor Cell Lymphoblastic Leukemia-Lymphoma/immunology*
  20. Menon, B.S., Mohamed, W.M., Majid, N.A., Ariff, A.R.
    MyJurnal
    We report a case of chemotherapy induced acute pan-creatitis in a child with acute lymphoblastic leukaemia. L-asparaginase is the most likely incriminating drug.
    Matched MeSH terms: Precursor Cell Lymphoblastic Leukemia-Lymphoma
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