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Fine needle aspiration cytology of lymph nodes in HIV-infected individuals

Jayaram G, Chew MT

Acta Cytol., 2000 Nov-Dec;44(6):960-6.
PMID: 11127753

OBJECTIVE: To assess the role of fine needle aspiration cytology (FNAC) in lymphadenopathy in human immunodeficiency virus-infected individuals (HIVII).

STUDY DESIGN: Thirty-nine HIVII presenting with lymphadenopathy at University Hospital, Kuala Lumpur, were subjected to FNAC. Cytologic smears were routinely stained with May-Grünwald-Giemsa stain. Special stains and immunostains were used when necessary.

RESULTS: In nine cases, the cytologic appearance was compatible with HIV type A and in one case with HIV type C lymphadenopathy. In 21 cases, acid-fast bacilli (AFB) were demonstrated in the cytologic smears, enabling a diagnosis of mycobacterial lymphadenitis. In one of these cases there was a concomitant infection with Penicillium marneffei that was overlooked on initial cytologic examination. The cause of granulomatous lymphadenitis could not be ascertained in one case, where neither AFB nor any other organisms were demonstrable. Two cases of histoplasma and one of cryptococcal lymphadenitis were diagnosed, as was one high grade non-Hodgkin's lymphoma that could be immunophenotyped on cytologic material. In three cases the aspirates were inadequate for a cytologic diagnosis.

CONCLUSION: Lymph node FNAC is a valuable investigative modality in HIVII. Most opportunistic infections (bacterial and fungal) can be correctly identified, and high grade lymphoma can be diagnosed and phenotyped.
Fulltext Neonatal tetanus: a study of five cases in Sandakan, Sabah

Lum SH, Chew MF

Med J Malaysia, 2009 Mar;64(1):80-2.
PMID: 19852330 MyJurnal

This study aims to study the demographics, clinical presentation, treatment and outcome of neonatal tetanus patients managed at Hospital Duchess of Kent from January 1st 2006 to December 31st 2006. Five neonates were studied. All presented with fever, poor sucking and limb stiffness, with a history of unsterile delivery and uncertain maternal tetanus immunity status. All were nursed in a minimal-stimuli environment and were given IV penicillin G, IM tetanus immunoglobulin and sedatives to control spasms. Nutrition and chest physiotherapy were rendered. Three patients required artificial ventilation. Duration of treatment ranged from 25 to 44 days. All survived. Inadequate maternal immunization, unsterile delivery and inappropriate umbilical cord care are major contributing factors of neonatal tetanus in our study. Supportive measures are the mainstay of treatment in our setting with very limited resources.
A checklist of the marine Anthuroidea (Crustacea: Isopoda: Cymothoida) from the reefs of Peninsular Malaysia, with some new distributional data

Chew M, Abdul Rahim A

Biodivers Data J, 2020;8:e54748.
PMID: 32675937 DOI: 10.3897/BDJ.8.e54748

Background: An up-to-date checklist of the Peninsular Malaysian marine Anthuroidea is presented, based on previous taxonomic or ecological literature and recent collections. The present study, a part of the subproject on the Biodiversity of Sultan Iskandar Marine Park, recognised 24 species in 12 genera and 5 families from Peninsular Malaysia. An extensive list of bibliographical references, detailed information on habitat and distributional records, museum locations of type material are provided for each species. Amongst the listed species, 11 are recently discovered Malaysian species belonging to the genera Amakusanthura Nunomura, 1977, Apanthura Stebbing, 1900, Expanathura Wägele, 1981, Leptanthura G. O. Sars, 1897, Kupellonura Barnard, 1925, Pendanthura Menzies & Glynn, 1968 and Tinggianthura Chew, Rahim & bin Haji Ross, 2014. Our records were limited to shallow subtidal reefs of peninsular Malaysian coast, suggesting that the number of species in the list may rise with an extensive survey.
New information: The up-to-date checklist of marine Anthuroidea of the Peninsular Malaysia comprises 24 species in 12 genera and 5 families, including some new distributional data.
Cytologic appearances in invasive lobular carcinoma of the breast. A study of 21 cases

Jayaram G, Swain M, Chew MT, Yip CH

Acta Cytol., 2000 Mar-Apr;44(2):169-74.
PMID: 10740602

OBJECTIVE: To examine the fine needle aspiration cytologic features of invasive lobular carcinoma of breast and to discuss problems that may occur in cytodiagnosis.

STUDY DESIGN: Fine needle aspiration cytologic smears from 21 cases of invasive lobular carcinoma (ILC) of breast were subjected to detailed cytomorphologic analysis. Features studied included pattern of cells, size of cells, nuclear placement, pleomorphism, presence of intracytoplasmic lumina (ICL) and signet ring cells.

RESULTS: Cellularity was generally moderate or high, and the pattern was predominantly or partly dissociated in 86% of cases. Rosettelike pattern was discerned in alveolar-type ILC. Cell size was usually small or intermediate, with nuclei placed eccentrically in most cases. ICLs with or without signet ring cells were present in 12 cases (57%).

CONCLUSION: A cytologic picture consisting of predominantly dissociated small or intermediate-sized tumor cells with eccentric nuclei, with some of the cells showing ICLs, is highly suggestive of ILC. Indian file pattern, another characteristic feature of ILC, is, however, focal and inconsistent. Variant patterns of ILC may show other cytologic features, such as rosettelike pattern (alveolar variant of ILC) or large cell pattern (pleomorphic variant of ILC) and may consequently be difficult to categorize on cytologic smears.
Diagnostic conundrum of a perineal tumour: a rectal gastrointestinal stromal tumour mimic

Shi R, Chew MH, Leow WQ

Malays J Pathol, 2017 Dec;39(3):293-296.
PMID: 29279593

Gastrointestinal stromal tumour (GIST) is a common mesenchymal tumour arising in the gastrointestinal tract, but not frequently encountered in the rectum. Herein, we describe a case of a rectal GIST which mimicked histomorphological features of a schwannoma; thus, making intraoperative frozen section evaluation challenging. Although subsequent immunohistochemistry and molecular findings readily confirmed the diagnosis of a GIST, we wish to draw attention to three clues that will help the pathologist steer clear of this potential diagnostic pitfall. One, GISTs are relatively more common than schwannomas in the rectum. Two, schwannomas usually have very little mitoses. Three, rectal GISTs commonly exhibit nuclear palisades. We also discuss the diagnostic, prognostic and therapeutic functions of immunohistochemical and molecular investigations. As the surgical intent for rectal GISTs is for en-bloc excision with wide margins, we surmise that the intraoperative consult should include GIST as a possible differential diagnosis for rectal mesenchymal tumours. In view of the potential for neoadjuvant treatment with imatinib before surgical excision to preserve sphincter function, a multidisciplinary approach is recommended for establishing most effective treatment strategy in these rare complex cases.
Fulltext Tinggianthura alba: a new genus and species of Anthuridae (Isopoda, Cymothoida, Anthuroidea) from Pulau Tinggi, Johor, Malaysia with an updated key to the genera of Anthuridae

Chew M, Abdul Rahim A, bin Haji Ross O

PLoS One, 2014;9(6):e99072.
PMID: 24914642 DOI: 10.1371/journal.pone.0099072

A new anthurid isopod from dead coral rubble and stones in the intertidal area of Pulau Tinggi, Johor, Malaysia, is described. It is placed in a new genus and species, Tinggianthura alba. Tinggianthura is characterized by: (1) subtriangular carpus shape of pereopods 4-7, (2) pereopod 1 propodus palm without prominent tooth or steps and (3) maxillipedal palp 2-articled.
Cytology of mucinous carcinoma of breast: a report of 28 cases with histological correlation

Jayaram G, Swain M, Chew MT, Yip CH, Moosa F

Malays J Pathol, 2000 Dec;22(2):65-71.
PMID: 16329537

Pure mucinous carcinoma (MC) of the breast is a relatively uncommon variant of breast carcinoma with distinctive histological and cytological features. In this study we have analysed fine needle aspiration (FNA) cytological material from 28 cases of MC of breast and correlated the cytomorphological features with histopathology. The 28 patients consisted of 27 females and one male patient. 14 patients were Chinese, 10 were Indian and four were Malay. Their ages ranged from 38 to 90 with a mean at 52 years. The left breast was involved in 17 and the right in 11 cases. The duration of the lump varied from two weeks to 10 years. The cytological picture was characterized by abundant extracellular mucin giving a "sea of mucin" or "whirlpools of mucin" effect, in which were seen floating clusters of tumour cells with relatively bland cytological features. Myxo-vascular fragments were seen in 12 cases. Dissociated tumour cells showed a plasmacytoid appearance with eccentric nuclei. In four cases, the mucin was scanty in amount and the cellularity was high while in two cases, the cellularity was very low. Psammoma bodies were seen in cytological smears in one case. Histological study of excision or mastectomy specimens confirmed all 28 cases to be pure MC. Knowledge of the distinctive cytomorphological appearance of MC would enable correct identification of these lesions as malignant and prompt treatment that could further enhance the survival of these prognostically good breast cancers.
Anti-dengue virus serotype 2 activity and mode of action of a novel peptide

Chew MF, Tham HW, Rajik M, Sharifah SH

J Appl Microbiol, 2015 Oct;119(4):1170-80.
PMID: 26248692 DOI: 10.1111/jam.12921

To identify a novel antiviral peptide against dengue virus serotype 2 (DENV-2) by screening a phage display peptide library and to evaluate its in vitro antiviral activity and mode of action.
Multiple umbilical cord strictures in a case of intrauterine foetal demise

Chew MX, Teoh PY, Wong YP, Tan GC

Malays J Pathol, 2019 Dec;41(3):365-368.
PMID: 31901924

INTRODUCTION: Umbilical cord abnormalities include short cord, long cord, knots, hyper-coiling, hypo-coiling, stricture, single umbilical artery, supernumerary umbilical vessels, cystic and vascular malformation, and abnormal insertion of cord like velamentous and furcate insertions. We report a case of intrauterine death in a fetus with multiple umbilical cord strictures and vascular thrombosis.
CASE REPORT: A 35-year-old woman delivered a stillborn female fetus at 33 weeks of gestation. No fetal anomaly was detected. Examination of the umbilical cord showed multiple strictures, located 4.5 cm and 20 cm from the placental insertion site. Microscopically, the stricture site showed Wharton's jelly being replaced by fibrosis with presence of vascular thrombosis.
DISCUSSION: Umbilical cord stricture is uncommon and has been described to be associated with intrauterine fetal death and a possibility of recurrent. There is a need to counsel the parents and close fetal surveillance in subsequent pregnancy is advise since the risk of recurrent remains uncertain.
Enzyme polymorphism of the malaria vector, An. balabacensis (Diptera: Culicidae) revisited--why sample natural populations?

Hii JL, Chew M, Vun YS, Nasir M, Chang MS

Southeast Asian J Trop Med Public Health, 1988 Dec;19(4):689-701.
PMID: 3238482

Two separate observations from recent electrophoretic studies of the systematics and population genetics of laboratory-reared populations which had a long history of colonization in various laboratories, were found to be inconsistent with the present study which used wild-caught populations from East Malaysia. Reanalysis of the two data sets generally indicated a low amount of genetic variation in laboratory colonies. The latter is characterized by higher frequency of monomorphic loci, low average heterozygosity values and, in one extreme case, no variability at two loci. However, natural populations of An. balabacensis and An. leucosphyrus showed more protein variability by the use of polyacrylamide gel electrophoresis. Since laboratory-maintained mosquitoes are genetically and phenotypically different from those in the field, results of laboratory studies on the systematics and population genetics of Anopheles species complexes may be biased.
Population genetic analysis of host seeking and resting behaviors in the malaria vector, Anopheles balabacensis (Diptera: Culicidae)

Hii JL, Chew M, Sang VY, Munstermann LE, Tan SG, Panyim S, et al.

J Med Entomol, 1991 Sep;28(5):675-84.
PMID: 1682492

During the intermonsoon period from mid-September to mid-October 1986, wild-caught Anopheles balabacensis Baisas females were marked and released in a host-choice experiment. Association between capture and recapture of marked mosquitoes from human and bovid hosts and blood meal host identification of recaptured females were determined on a daily basis. Although the mark-recapture and blood meal data indicated behavioral heterogeneity between buffalo and human biters, restriction endonuclease fragment length polymorphism analysis revealed no differences in repeat sequence profiles. Doubly-marked recaptures strongly indicated a "learning" component involved in a separate host preference experiment. In a "habitat loyalty" experiment conducted in January 1987, females of An. balabacensis preferentially returned to the resting sites (indoor surfaces and exit traps) where they were first caught. Of nine isozyme loci found to be polymorphic, the genotypic frequencies of Esterase-3 and Isocitrate dehydrogenase-3 were different in "faithfully" endophilic and exophilic subpopulations. Genetic heterozygosity, as determined by polyacrylamide gel electrophoresis, was greater in exophilic than endophilic population components. These results confirm that genetic and learning components can significantly influence house resting and host seeking behavior and may contribute to local epidemiological patterns of malaria transmission observed in Sabah, Malaysia.
Cyclooxygenase-2 (COX2) expression in adenocarcinoma surpasses that of squamous cell carcinoma in the uterine cervix

Marutha Muthu AK, Cheah PL, Koh CC, Chew MF, Toh YF, Looi LM

Malays J Pathol, 2017 Dec;39(3):251-255.
PMID: 29279587 MyJurnal

Over the years, adenocarcinoma (ADC), which has a worse prognosis than squamous cell carcinoma (SCC) of the cervix, has shown an increasing trend. Cyclooxygenase-2 (COX2) expression which has been associated with worse prognosis in several solid cancers was studied for its association with SCC and ADC of the cervix. 35 histologically re-confirmed SCC and 35 ADC were immunohistochemically stained for COX2 using a mouse monoclonal antibody to COX2 (1:100; Dako: Clone CX-294) on a Ventana Benchmark XT. The histoscore was computed as intensity of staining, semi-quantitated on a scale of 0-3 with 0 = negative, 1 = weak, 2 = moderate and 3 = strong staining intensity; multiplied by percentage of immunopositivity on a scale of 0-4 with 0 = <1%, 1 = 1-25%, 2 = 26-50%, 3 = 51-75% and 4 = ≥75% of immunopositive tumour cells. Histoscore 1-3/12 was considered as low and ≥4/12 as high COX2 expression. SCC affected Chinese more than Malays, while Malays had more ADC (p = 0.032). Mean age at presentation of SCC (57.5 years) was about a decade later than ADC at 47.9 years (p = 0.002). 30/35 (85.7%) of SCC and 34/35 (97.1%) of ADC expressed COX2. Histoscores of ADC (median = 4.0, IQR = 3.0-6.0) was significantly higher (p = 0.014) than those of SCC (median = 3.0, IQR = 2.0-3.0). High histoscores (≥4/12) were more frequent in ADC (55.9%) compared with SCC (26.7%) (p = 0.018), implicating COX2, either directly or indirectly, as a possible player in influencing the poorer outcome of ADC compared with SCC.
Risk factors for Nipah virus infection among abattoir workers in Singapore

Chew MH, Arguin PM, Shay DK, Goh KT, Rollin PE, Shieh WJ, et al.

J Infect Dis, 2000 May;181(5):1760-3.
PMID: 10823780

During 10-19 March 1999, 11 workers in 1 of 2 Singaporean abattoirs developed Nipah-virus associated encephalitis or pneumonia, resulting in 1 fatality. A case-control study was conducted to determine occupational risk factors for infection. Case patients were abattoir A workers who had anti-Nipah IgM antibodies; control subjects were randomly selected abattoir A workers who tested negative for anti-Nipah IgM. All 13 case patients versus 26 (63%) of 41 control subjects reported contact with live pigs (P=.01). Swine importation from Malaysian states concurrently experiencing a Nipah virus outbreak was banned on 3 March 1999; on 19 March 1999, importation of Malaysian pigs was banned, and abattoirs were closed. No unusual illnesses among pigs processed during February-March were reported. Contact with live pigs appeared to be the most important risk factor for human Nipah virus infection. Direct contact with live, potentially infected pigs should be minimized to prevent transmission of this potentially fatal zoonosis to humans.
Fulltext A common variant near TGFBR3 is associated with primary open angle glaucoma

Li Z, Allingham RR, Nakano M, Jia L, Chen Y, Ikeda Y, et al.

Hum Mol Genet, 2015 Jul 01;24(13):3880-92.
PMID: 25861811 DOI: 10.1093/hmg/ddv128

Primary open angle glaucoma (POAG), a major cause of blindness worldwide, is a complex disease with a significant genetic contribution. We performed Exome Array (Illumina) analysis on 3504 POAG cases and 9746 controls with replication of the most significant findings in 9173 POAG cases and 26 780 controls across 18 collections of Asian, African and European descent. Apart from confirming strong evidence of association at CDKN2B-AS1 (rs2157719 [G], odds ratio [OR] = 0.71, P = 2.81 × 10(-33)), we observed one SNP showing significant association to POAG (CDC7-TGFBR3 rs1192415, ORG-allele = 1.13, Pmeta = 1.60 × 10(-8)). This particular SNP has previously been shown to be strongly associated with optic disc area and vertical cup-to-disc ratio, which are regarded as glaucoma-related quantitative traits. Our study now extends this by directly implicating it in POAG disease pathogenesis.

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