MyMedR

Fulltext Temporal bone squamous cell carcinoma - Penang experience

Ng SY, Pua KC, Zahirrudin Z

Med J Malaysia, 2015 Dec;70(6):367-8.

Temporal bone squamous cell carcinoma (TBSCC) is rare and poses difficulties in diagnosing, staging and management. We describe a case series with six patients who were diagnosed TBSCC, from January 2009 to June 2014, with median age of 62 years old. All patients presented with blood-stain discharge and external auditory canal mass, showing that these findings should highly alert the diagnosis of TBSCC. Three patients staged T3 and another three with T4 disease. High-resolution CT (HRCT) temporal findings were noted to be different from intraoperative findings and therefore we conclude that MRI should be done to look for middle ear involvement or other soft tissue invasion for more accurate staging. Lateral temporal bone resection (LTBR) and parotidectomy was done for four patients with or without neck dissection. Patients with positive margin, perineural invasion or parotid and glenoid involvement carry poorer prognosis and postoperative radiotherapy may improve the survival rate. One patient had successful tumor resection via piecemeal removal approach in contrast with the recommended en bloc resection shows that with negative margin achieved, piecemeal removal approach can be a good option for patients with T2-3 disease. In general, T4 tumor has dismal outcome regardless of surgery or radiotherapy given.

Fulltext Paraneoplastic neurological disorder in nasopharyngeal carcinoma

Ng SY, Kongg MH, Yunus MR

Malays J Med Sci, 2017 Mar;24(1):113-116.

PMID: 28381934 DOI: 10.21315/mjms2017.24.1.12

Paraneoplastic neurological disorder (PND) is a condition due to immune cross-reactivity between the tumour cells and the normal tissue, whereby the "onconeural" antibodies attack the normal host nervous system. It can present within weeks to months before or after the diagnosis of malignancies. Nasopharyngeal carcinoma is associated with paraneoplastic syndrome, for example, dermatomyositis, and rarely with a neurological disorder. We report on a case of nasopharyngeal carcinoma with probable PND. Otolaryngologists, oncologists and neurologists need to be aware of this condition in order to make an accurate diagnosis and to provide prompt treatment.

The magnitude of tyrosine kinase inhibitor induced cytopaenia on normal haematopoietic tissues in chronic myeloid leukaemia patients

Kuan JW, Ng SY, Hon SL, Lim SM, Chai AJM, Teo HG, et al.

Int J Lab Hematol, 2023 Feb;45(1):e1-e5.

PMID: 35896146 DOI: 10.1111/ijlh.13940

A new cembrane-type diterpenoid from Bornean liverwort Chandonanthus hirtellus

Ng SY, Kamada T, Suleiman M, Vairappan CS

J Asian Nat Prod Res, 2016 Jul;18(7):690-6.

PMID: 26828126 DOI: 10.1080/10286020.2015.1134503

A new compound, chandonanol (1), along with four known compounds, chandonanthone (2), iso-chandonanthone (3), anastreptene (4), and (6R,7S)-sesquiphellandrene (5), was isolated from the MeOH extract of Bornean liverwort Chandonanthus hirtellus. The structure of the new metabolite was established by analyses of the spectroscopic data (1D NMR, 2D NMR, HRESIMS, and IR). These compounds were tested for their activity against antibiotic-resistant clinical strains. Chandonanol (1) exhibited potent bactericidal activity against Staphylococcus aureus and Escherichia coli.

Fulltext Capgermacrenes A and B, Bioactive Secondary Metabolites from a Bornean Soft Coral, Capnella sp

Phan CS, Ng SY, Kim EA, Jeon YJ, Palaniveloo K, Vairappan CS

Mar Drugs, 2015 May;13(5):3103-15.

PMID: 25996100 DOI: 10.3390/md13053103

Two new bicyclogermacrenes, capgermacrenes A (1) and B (2), were isolated with two known compounds, palustrol (3) and litseagermacrane (4), from a population of Bornean soft coral Capnella sp. The structures of these metabolites were elucidated based on spectroscopic data. Compound 1 was found to inhibit the accumulation of the LPS-induced pro-inflammatory IL-1b and NO production by down-regulating the expression of iNOS protein in RAW 264.7 macrophages.

Fulltext Terpenoids from Marine Soft Coral of the Genus Xenia in 1977 to 2019

Ng SY, Phan CS, Ishii T, Kamada T, Hamada T, Vairappan CS

Molecules, 2020 Nov 18;25(22).

PMID: 33217924 DOI: 10.3390/molecules25225386

Members of the marine soft coral genus Xenia are rich in a diversity of diterpenes. A total of 199 terpenes consisting of 14 sesquiterpenes, 180 diterpenes, and 5 steroids have been reported to date. Xenicane diterpenes were reported to be the most common chemical skeleton biosynthesized by members of this genus. Most of the literature reported the chemical diversity of Xenia collected from the coral reefs in the South China Sea and the coastal waters of Taiwan. Although there was a brief review on the terpenoids of Xenia in 2015, the present review is a comprehensive overview of the structural diversity of secondary metabolites isolated from soft coral genus Xenia and their potent biological activity as reported between 1977 to 2019.

A New Seco-Clerodane-Type Diterpenoid from Bornean Liverwort Schistochila acuminata

Ng SY, Kamada T, Suleiman M, Vairappan CS

Nat Prod Commun, 2016 Aug;11(8):1071-1072.

PMID: 30725558

A new compound, schistochilic acid D (1) and two known compounds (2 and 3) were isolated from MeOH extract of Bornean liverwort. Schistochila acuininata collected from Mount Trus Madi, Sabah. The structure of the new metabolite was established based on spectroscopic (ID NMR, 2D NMR, and IR). and HRESIMS data. In addition, another population of S. acuminata collected from Mount Alab (Sabah) yielded four known compounds, 2, 3, 4 and 5. These compounds were tested for their biological potential against the B 16-Fl0 cell line. Compounds 4 and 5 exhibited weak cytotoxic activity.

Fulltext A New Epi-neoverrucosane-type Diterpenoid from the Liverwort Pleurozia subinflata in Borneo

Kamada T, Johanis ML, Ng SY, Phan CS, Suleiman M, Vairappan CS

Nat Prod Bioprospect, 2020 Feb;10(1):51-56.

PMID: 32062804 DOI: 10.1007/s13659-020-00232-6

New bioactive 13-epi-neoverrucosane diterpenoid, 5β-acetoxy-13-epi-neoverrucosanic acid (1) along with three known secondary metabolites, 13-epi-neoverrucosan-5β-ol (2), chelodane (3) and (E)-β-farnesene (4) were isolated from the MeOH extract of east Malaysia's liverwort Pleurozia subinflata. The chemical structure of new compound was elucidated by the analyses of its spectroscopic data (FTIR, NMR and HR-ESI-MS). These epi-neoverrucosane-type compounds seem to be notable chemosystematic markers for P. subinflata in Borneo. Compound 3 was widespread in marine sponges however this is the first record for 3 to be found in liverwort. These metabolites were tested for their antifungal potentials against selected fungi from the marine environment. Compound 1 exhibited effective antifungal activity against Lagenidium thermophilum.

Two new clerodane-type diterpenoids from Bornean liverwort Gottschelia schizopleura and their cytotoxic activity

Ng SY, Kamada T, Suleiman M, Vairappan CS

Nat Prod Res, 2018 Aug;32(15):1832-1837.

PMID: 29156972 DOI: 10.1080/14786419.2017.1405409

The Bornean liverwort Gottschelia schizopleura was investigated phytochemically for the first time. Two new and four previously known clerodane-type diterpenoids were isolated from the MeOH extract of G. schizopleura through a series of chromatographic techniques. The structures of the new metabolites were established by analyses of their spectroscopic data (1D NMR, 2D NMR, HRESIMS and IR). All the isolated compounds 1-6 were tested against human promyelocytic leukaemia (HL-60), human colon adenocarcinoma (HT-29) and Mus musculus skin melanoma (B16-F10). Compound 1 and 2 showed active inhibition against HL-60 and B16-F10 cells.

Fulltext Satisfaction of patients receiving value added-services compared to traditional counter service for prescription refills in Malaysia

Lau BT, Nurul-Nadiah-Auni AR, Ng SY, Shuen-Wong N

Pharm Pract (Granada), 2018 03 23;16(1):1075.

PMID: 29619135 DOI: 10.18549/PharmPract.2018.01.1075

Background: Patients' satisfaction is the key parameter to measure the quality of healthcare services. Value added-services (VAS) were introduced to improve the quality of medication deliveries and to reduce the waiting time at outpatient pharmacy.
Objective: This study aimed to compare the satisfaction levels of patients receiving VAS and traditional counter service (TCS) for prescription refills in Port Dickson Hospital.
Methods: A single-center, cross-sectional study was conducted in the outpatient pharmacy department of Port Dickson Hospital from 1 March to 30 June 2017. Systematic sampling method was utilized to recruit subjects into the study, except mail pharmacy in which universal sampling method was used. Data collection was done via telephone interviews for both groups.
Results: There was 104 and 105 in TCS and VAS group respectively. The response rate was 99.5%. Overall, a significant higher total mean satisfaction score in VAS group was observed as compared to TCS group (43.39 versus 40.49, p=0.002). The same finding was observed after confounding factors were controlled (VAS=44.66, 95% CI 43.07:46.24 versus TCS=39.88, 95% CI 38.29:41.46; p<0.001). VAS respondents reported more satisfaction than TCS respondents for both general and technical aspects. Among the VAS offered, mail pharmacy service respondents showed highest total mean satisfaction score, but no significant different was seen between groups (p=0.064).
Conclusion: VAS respondents were generally more satisfied than TCS respondents for prescription refills. A longitudinal study is necessary to examine the impact of other dimensions and other types of VAS on patients' satisfaction levels.
Study site: outpatient clinic, Hospital Port Dickson, Negeri Sembilan, Malaysia

Fulltext The Effects of Drying Techniques on Phytochemical Contents and Biological Activities on Selected Bamboo Leaves

Benjamin MAZ, Ng SY, Saikim FH, Rusdi NA

Molecules, 2022 Sep 30;27(19).

PMID: 36234995 DOI: 10.3390/molecules27196458

The therapeutic potential of bamboos has acquired global attention. Nonetheless, the biological activities of the plants are rarely considered due to limited available references in Sabah, Malaysia. Furthermore, the drying technique could significantly affect the retention and degradation of nutrients in bamboos. Consequently, the current study investigated five drying methods, namely, sun, shade, microwave, oven, and freeze-drying, of the leaves of six bamboo species, Bambusa multiplex, Bambusa tuldoides, Bambusa vulgaris, Dinochloa sublaevigata, Gigantochloa levis, and Schizostachyum brachycladum. The infused bamboo leaves extracts were analysed for their total phenolic content (TPC) and total flavonoid content (TFC). The antioxidant activities of the samples were determined via the 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), and ferric reducing antioxidant power (FRAP) assays, whereas their toxicities were evaluated through the brine shrimp lethality assay (BSLA). The chemical constituents of the samples were determined using liquid chromatography−tandem mass spectrometry (LC-MS/MS). The freeze-drying method exhibited the highest phytochemical contents and antioxidant activity yield, excluding the B. vulgaris sample, in which the microwave-dried sample recorded the most antioxidant and phytochemical levels. The TPC and TFC results were within the 2.69 ± 0.01−12.59 ± 0.09 mg gallic acid equivalent (GAE)/g and 0.77 ± 0.01−2.12 ± 0.01 mg quercetin equivalent (QE)/g ranges, respectively. The DPPH and ABTS IC50 (half-maximal inhibitory concentration) were 2.92 ± 0.01−4.73 ± 0.02 and 1.89−0.01 to 3.47 ± 0.00 µg/mL, respectively, indicating high radical scavenging activities. The FRAP values differed significantly between the drying methods, within the 6.40 ± 0.12−36.65 ± 0.09 mg Trolox equivalent (TE)/g range. The phytochemical contents and antioxidant capacities exhibited a moderate correlation, revealing that the TPC and TFC were slightly responsible for the antioxidant activities. The toxicity assessment of the bamboo extracts in the current study demonstrated no toxicity against the BSLA based on the LC50 (lethal concentration 50) analysis at >1000 µg/mL. LC-MS analysis showed that alkaloid and pharmaceutical compounds influence antioxidant activities, as found in previous studies. The acquired information might aid in the development of bamboo leaves as functional food items, such as bamboo tea. They could also be investigated for their medicinal ingredients that can be used in the discovery of potential drugs.

Acquired idiopathic lipoatrophic panniculitis in a 12-month-old infant

Ng SY, D'Arcy C, Orchard D

Australas J Dermatol, 2015 Nov;56(4):e102-4.

PMID: 24635514 DOI: 10.1111/ajd.12159

Lipoatrophic panniculitis is a rare condition affecting mainly children, often associated with connective tissue disease. We report a healthy 12-month-old girl with no clinical or laboratory features of connective tissue disease who presented with the progressive appearance of annular atrophic plaques beginning at the left arm. A histopathological analysis revealed lobular panniculitis, with fat necrosis and an associated inflammatory infiltrate supporting the diagnosis of lipoatrophic panniculitis. Lipoatrophic panniculitis should be considered in infants and young children with clinical features of panniculitis and fat atrophy even without clinical or serologic evidence of connective tissue disease.

Multiple clustered dermatofibroma presenting in a segmental distribution

Bhabha FK, Magee J, Ng SY, Grills CE, Su J, Orchard D

Australas J Dermatol, 2016 Feb;57(1):e20-2.

PMID: 25557526 DOI: 10.1111/ajd.12257

Multiple dermatofibromas is a rare entity consisting of more than fifteen lesions. Multiple clustered dermatofibroma is a distinct variant of multiple dermatofibromas and is defined as a well-demarcated plaque composed of individual dermatofibromas. We report a 16-year-old boy with multiple clustered dermatofibroma in a segmental distribution, which has previously not been reported in the literature.

Segmental juvenile xanthogranuloma

Ng SY

Pediatr Dermatol, 2014 Sep-Oct;31(5):615-7.

PMID: 23889163 DOI: 10.1111/pde.12199

A 5-month-old boy had erythematous nodules over the left side of his trunk with a segmental arrangement since birth. Histopathologic examination revealed sheets of foamy histiocytes infiltrating the dermis and subcutaneous fat, admixed with multinucleated giant cells and lymphocytes, making this an unusual case of juvenile xanthogranuloma appearing in a segmental distribution.

Fulltext Solitary Ulcerated Congenital Giant Juvenile Xanthogranuloma

Ng SY

Indian J Dermatol, 2015 Jul-Aug;60(4):420.

PMID: 26288431 DOI: 10.4103/0019-5154.160515

A 3-month-old female patient with a giant ulcerated nodule over the back since birth was diagnosed as congenital giant juvenile xanthogranuloma (JXG) based on clinical and histopathological examination. Congenital giant JXG with ulceration at birth is a rare presentation of JXG and commonly misdiagnosed. This case emphasizes the importance of being aware of the myriad presentations of JXG in order to make a correct diagnosis and avoid unnecessary investigations or treatment.

Fulltext Patient satisfaction with medication therapy adherence clinic services in a district hospital: a cross-sectional study

Sim YC, Mohd-Rosli IS, Lau BT, Ng SY

Pharm Pract (Granada), 2021 06 02;19(2):2353.

PMID: 34221203 DOI: 10.18549/PharmPract.2021.2.2353

Background: Patient satisfaction is one of the essential indicators for assessing the quality of healthcare services being delivered, including pharmacy ambulatory care service, as it determines the practicability and sustainability of the service provided. As such, pharmaceutical care services provided during medication therapy adherence clinic (MTAC) sessions need to be assessed to maximise its effectiveness and benefits to the patients.

Objective: This study aimed to assess the association between patient satisfaction and socio-demographic characteristics, as well as the predictors for patient satisfaction.

Methods: This was a cross-sectional study conducted at the medical outpatient department in Hospital Port Dickson from January until October 2019. Convenience sampling method was used to recruit potential study participants. Patient satisfaction was measured using Validated Patient Satisfaction with Pharmacist Services Questionnaire (PSPSQ2.0), consisted of quality of care and interpersonal relationship between pharmacist and patient domains. Descriptive data were presented as mean and standard deviation or numbers and percentages, while Independent Sample t-test, ANOVA and post-hoc analysis, and multiple linear regression were used for inferential data analysis.

Results: There were 37 (25%) diabetes MTAC, 36 (24.3%) respiratory MTAC, and 75 (50.7%) warfarin MTAC patients recruited. On average, the mean overall satisfaction score was 3.30(SD=0.43). The mean satisfaction score in the interpersonal relationship domain [3.35(SD=0.44)] was higher than the quality of care domain [3.26(SD=0.45)]. There was a significant association between gender, education level, and patient satisfaction towards pharmaceutical care service (p<0.05). Gender and education level statistically predicted respondents' satisfaction with MTAC services (p<0.001).

Conclusions: The overall patient satisfaction towards MTAC services in this setting was high. Gender and education level were significant predictors for patient satisfaction. These findings could potentially contribute to the planning of MTAC services in the future.

Fulltext Optimization of Residual Hexane in Edible Oils Analysis Using Static Headspace Gas Chromatography

Samsuri AH, Ang MY, Ng SY

Int J Anal Chem, 2021;2021:1941336.

PMID: 34745265 DOI: 10.1155/2021/1941336

This study aims to determine the residual hexane in four edible oils in Malaysia using a simple, rapid, and automated method in order to improve the efficiency and productivity of the analysis. Gas chromatography (GC/FID) equipped with a headspace autosampler (HS-20) was used to perform the analysis. Incubation time for each injection was successfully optimized from one hour to 30 minutes (50% reduction) compared to the official AOCS method Ca 3b-87. Out of the four tested edible oils, only the hexane residues detected in sunflower oil exceeded the maximum residue limit (MRL) set by the European Union regulation. Significant difference of the results obtained between large calibration range (0-938 mg kg-1) and small calibration range (0-68 mg kg-1) suggests that there is a need to use a lower standard calibration concentration to avoid misinterpretation of analysis results. Method validation applies to the technical hexane; 2-methylpentane, 3-methylpentane, cyclohexane, and methylcyclopentane, the signal-to-noise (S/N), as well as the limit of quantification (LoQ) values was found to be 218.20, 221.45, 746.37, 97.37 and 0.85, 0.84, 0.25, 1.93 mg kg-1, respectively. Good linearity, repeatability, and low carryover of this method have provided an alternative way to analyze the content of the residual hexane in edible oils in a more efficient manner. Current study might provide a fundamental reference for the improvement of the AOCS official Ca 3b-87 method for determination of hexane residues in fats and oils analysis in the future.

Anonychia

Ng SY

J Pediatr, 2023 Dec;263:113664.

PMID: 37562741 DOI: 10.1016/j.jpeds.2023.113664

Active targeted ligand-aza-BODIPY conjugate for near-infrared photodynamic therapy in melanoma

Ng SY, Kamkaew A, Fu N, Kue CS, Chung LY, Kiew LV, et al.

Int J Pharm, 2020 Apr 15;579:119189.

PMID: 32126251 DOI: 10.1016/j.ijpharm.2020.119189

Active targeting compound, a non-iodinated derivative of IK-IK-I2-azaBODIPY (1a) was previously reported to preferentially bind melanoma over healthy cells. In this study, we evaluate the photodynamic therapy (PDT) efficiency on melanoma cells of 1a, together with its reversed sequence compound KI-KI-I2-azaBODIPY (1b) and a non-targeted control I2-azaBODIPY-NH2 (2). All three test compounds possess absorption wavelengths in the near-infrared (NIR) region (λmax between 678 and 687 nm) which alleviate melanin interference and allow deeper tissue penetration. In vitro studies revealed 1a and 1b are promising photosensitizers with enhanced singlet oxygen generation, have increased uptake by B16-F10 melanoma cells via clathrin-mediated endocytosis and good photocytotoxic efficacies. Ex vivo biodistribution assays showed both 1a and 1b accumulated in the tumour. In B16-F10 tumour bearing-C57BL/6 mice, 10 mg/kg of 1b and light irradiation was found to reduce tumour volume by up to 23% at day-3. Doubling the dosage of 1b (20 mg/kg) enhanced the antitumour effect, showing 96% maximum tumour volume reduction at day-7 and tumour growth suppression for up to 12 days.

Recent strategies to improve boron dipyrromethene (BODIPY) for photodynamic cancer therapy: an updated review

Kue CS, Ng SY, Voon SH, Kamkaew A, Chung LY, Kiew LV, et al.

Photochem Photobiol Sci, 2018 Nov 01;17(11):1691-1708.

PMID: 29845993 DOI: 10.1039/c8pp00113h

BODIPYs are photosensitizers activatable by light to generate highly reactive singlet oxygen (1O2) from molecular oxygen, leading to tissue damage in the photoirradiated region. Despite their extraordinary photophysical characteristics, they are not featured in clinical photodynamic therapy. This review discusses the recent advances in the design and/or modifications of BODIPYs since 2013, to improve their potential in photodynamic cancer therapy and related areas.

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