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result(s) for
"Chong, Wan"
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Impacts of Langmuir turbulence derived from a statistical wave model on the oceanic mean state in the North Atlantic
by
Wan, Chong
,
Ma, Libin
in
Atlantic Meridional Overturning Circulation (AMOC)
,
Bias
,
Climate models
2024
The study assesses impact of Langmuir turbulence on simulations in the North Atlantic using a climate system model. Instead of coupling a prognostic wave model online, we utilize a statistical wave model, which is implemented into a turbulent kinetic energy (TKE) closure scheme, to estimate Stokes drift aiming to reduce computational expenses. Another two parameterizations, including without Langmuir turbulence and Stokes drift directly estimated by wind stress, are also compared to explore the priority of the statistical wave model. Our findings indicate that enhanced turbulent mixing induced by Langmuir turbulence can mitigate cold sea surface temperature and fresh sea surface salinity biases in the North Atlantic, as well as shallow mixed-layer depth biases in the Labrador Sea. Additionally, simulation of the Atlantic Meridional Overturning Circulation (AMOC) is improved. This improvement is attributed to enhanced turbulent mixing due to Langmuir turbulence, which increases eddy vertical diffusivity and buoyancy loss, thereby weakening stratification in surface and thermocline layers. Consequently, reduced stratification enhances deep convection and the generation of North Atlantic Deep Water during boreal winter, ultimately strengthening the AMOC. Importantly, the parameterization that Stokes drift inferred from the statistical wave model outperforms the alternative method directly inferred from wind stress, providing the most compelling improvements in North Atlantic simulations within our fully coupled model.
Journal Article
Genomic profile of Chinese patients with endometrial carcinoma
by
Wan, Chong
,
Li, Xiaoqi
,
Li, Xiaoqiu
in
1-Phosphatidylinositol 3-kinase
,
AKT1 protein
,
Analysis
2023
Backgrounds
Endometrial carcinoma (EC) is one of the most commonly diagnosed gynecologic malignancy in China. However, the genetic profile of Chinese EC patients has not been well established yet.
Methods
In current study, 158 Chinese EC patients were subjected to next-generation sequencing assay (74 took testing of EC-related 20-genes panel, and 84 took the expanded panel). Of the 158 patients, 91 patients were performed germline mutation testing using the expanded panel. Moreover, the public datasets from TCGA and MSKCC were utilized to compare the genomic differences between Chinese and Western EC patients. The proteomic and transcriptomic from CPTAC and TCGA were derived and performed unsupervised clustering to identify molecular subtypes.
Results
Among the 158 patients analyzed, a significant majority (85.4%) exihibited at least one somatic alteration, with the most prevalent alterations occurring in
PTEN
,
PIK3CA
,
TP53
, and
ARID1A
. These genomic alterations were mainly enriched in the PI3K, cell cycle, RAS/RAF/MAPK, Epigenetic modifiers/Chromatin remodelers, and DNA damage repair (DDR) signaling pathways. Additionally, we identified ten individuals (11.0%) with pathogenic or likely pathogenic germline alterations in seven genes, with the DDR pathway being predominantly involved. Compared to Western EC patients, Chinese EC patients displayed different prevalence in
AKT1
,
MET
,
PMS2
,
PIK3R1
, and
CTCF
. Notably, 69.6% of Chinese EC patients were identified with actionable alterations. In addition, we discovered novel molecular subtypes in
ARID1A
wild-type patients, characterized by an inferior prognosis, higher
TP53
but fewer
PTEN
and
PIK3CA
alterations. Additionally, this subtype exhibited a significantly higher abundance of macrophages and activated dendritic cells.
Conclusion
Our study has contributed valuable insights into the unique germline and somatic genomic profiles of Chinese EC patients, enhancing our understanding of their biological characteristics and potential therapeutic avenues. Furthermore, we have highlighted the presence of molecular heterogeneity in ARID1A-wild type EC patients, shedding light on the complexity of this subgroup.
Journal Article
Cockpit instrument lighting design and evaluation
2025
This paper introduces the optical simulation software SPEOS based on the Monte Carlo algorithm to assist cockpit design in aircraft cockpit design. The purpose is to simulate and analyze different design schemes of aircraft cockpit instrument lighting in the design stage to determine whether the existing design scheme will have an adverse effect on human vision. This not only avoids the huge economic waste caused by the subsequent modification of the aircraft when problems are found in the manufacturing of sample sections or real aircraft cabin sections but also provides a more convenient and effective design and design inspection method for aircraft cockpit design engineers.
Journal Article
Pembrolizumab with or without bevacizumab in platinum-resistant recurrent or metastatic nasopharyngeal carcinoma: a randomised, open-label, phase 2 trial
2025
Vascular endothelial growth factor (VEGF) is overexpressed in nasopharyngeal carcinoma and suppresses the anti-tumour immune response. Previous studies have shown that adding anti-VEGF treatment to PD-1 inhibition treatment strategies improves tumour response. We aimed to compare the efficacy of pembrolizumab, a PD-1 inhibitor, with or without bevacizumab, a VEGF inhibitor, in nasopharyngeal carcinoma.
In this randomised, open-label, phase 2 trial done at two hospitals (National University Cancer Institute and Tan Tock Seng Hospital) in Singapore, patients with platinum-resistant recurrent or metastatic nasophayngeal carcinoma were eligible if they were aged 21 years or older and had an Eastern Cooperative Oncology Group (ECOG) performance status of 0–1. Patients were assigned (1:1; using random permuted blocks with varying sizes of 4 and 6) to receive either intravenous pembrolizumab (200 mg) every 21 days or a combination of pembrolizumab with intravenous bevacizumab (7·5 mg/kg) administered 1 week prior to each dose, until radiographic disease progression, unacceptable toxicity, completion of 32 cycles, or withdrawal of consent. The study was open label, therefore no masking of treatment assignment was implemented. The primary endpoint was objective response rate, assessed using RECIST (version 1.1) by independent radiologists and analysed in the intention-to-treat population (ie, all randomly assigned patients). This trial is registered with ClinicalTrials.gov, NCT03813394, and enrolment has closed.
Between May 13, 2019, and Dec 6, 2023, we assessed 60 individuals for eligibility, 12 were excluded, and 48 were randomly allocated to pembrolizumab alone (n=24) or a combination of bevacizumab and pembrolizumab (n=24). The median age was 56 years (IQR 48–65), and 40 (83%) of 48 patients were male and eight (17%) were female. The median follow-up was 28·3 months (IQR 15·1–55·9). The objective response rate was significantly higher in the bevacizumab and pembrolizumab group (58·3% [95% CI 36·6–77·9] than in the pembrolizumab group (12·5% [2·7–32·4]; unadjusted RR 4·67 [95% CI 1·54–14·18]; p=0·0010). Grade 3 treatment-related adverse events occurred in two (8%) of 24 patients in the pembrolizumab group and in seven (29%) of 24 patients in the bevacizumab and pembrolizumab group; the most common severe or grade 3–4 treatment-related adverse events were thrombosis or bleeding (four [17%] of 24 patients in the bevacizumab and pembrolizumab group vs none of 24 patients in the pembrolizumab group), and others were transaminitis (none vs 1 [4%]), colitis (1 [4%] vs none]), cytopenias (none vs 1 [4%]), dermatological toxicities (1 [4%] vs none]), hypertension (1 [4%] vs none]), and proteinuria (1 [4%] vs none]). There were no grade 4 treatment-related adverse events or treatment-related deaths in either group.
Pembrolizumab in combination with bevacizumab was more efficacious than pembrolizumab monotherapy, with manageable toxicities in platinum-resistant nasopharyngeal carcinoma. If validated in a phase 3 trial, the combination therapy could be a new standard of care in this population of patients.
National Medical Research Council of Singapore, National Research Foundation Singapore, Singapore Ministry of Education under its Research Centres of Excellence initiatives, and Merck Sharp & Dohme.
Journal Article
Characterization of tumor microenvironment and tumor immunology based on the double-stranded RNA-binding protein related genes in cervical cancer
2023
Background
Cervical cancer is one of the most common gynecological cancers threatening women’s health worldwide. Double-stranded RNA-binding proteins (dsRBPs) regulate innate immunity and are therefore believed to be involved in virus-related malignancies, however, their role in cervical cancer is not well known.
Methods
We performed RNA-seq of tumor samples from cervical cancer patients in local cohort and also assessed the RNA-seq and clinical data derived from public datasets. By using single sample Gene Set Enrichment Analysis (ssGSEA) and univariate Cox analysis, patients were stratified into distinct dsRBP clusters. Stepwise Cox and CoxBoost were performed to construct a risk model based on optimal dsRBPs clusters-related differentially expressed genes (DEGs), and GSE44001 and CGCI-HTMCP-CC were employed as two external validation cohorts. Single cell RNA sequencing data from GSE168652 and Scissor algorithm were applied to evaluated the signature-related cell population.
Results
The expression of dsRBP features was found to be associated with HPV infection and carcinogenesis in CESC. However, only Adenosine deaminases acting on RNA (ADAR) and Dicer, Drosha, and Argonautes (DDR) exhibited significant correlations with the overall survival (OS) of CESC patients. Based on these findings, CESC patients were divided into three dsRBP clusters. Cluster 3 showed superior OS but lower levels of ADAR and DDR. Additionally, Cluster 3 demonstrated enhanced innate immunity, with significantly higher activity in cancer immunity cycles, immune scores, and levels of tumor-infiltrating immune cells, particularly CD8+ T cells. Furthermore, a risk model based on nine dsRBP cluster-related DEGs was established. The accuracy of survival prediction for 1 to 5 years was consistently above 0.78, and this model’s robust predictive capacity was confirmed by two external validation sets. The low-risk group exhibited significantly higher levels of immune checkpoints, such as PDCD1 and CTLA4, as well as a higher abundance of CD8+ T cells. Analysis of single-cell sequencing data revealed a significant association between the dsRBP signature and glycolysis. Importantly, low-risk patients showed improved OS and a higher response rate to immunotherapy, along with enduring clinical benefits from concurrent chemoradiotherapy.
Conclusions
dsRBP played a crucial role in the regulation of prognosis and tumor immunology in cervical cancer, and its prognostic signature provides a strategy for risk stratification and immunotherapy evaluation.
Journal Article
Comprehensive genomic profiling of upper tract urothelial carcinoma and urothelial carcinoma of the bladder identifies distinct molecular characterizations with potential implications for targeted therapy & immunotherapy
by
Xiong, Shengwei
,
Li, Xuesong
,
Zhou, Liqun
in
1-Phosphatidylinositol 3-kinase
,
Bladder
,
BRCA1 protein
2023
Despite the genomic landscape of urothelial carcinomas (UC) patients, especially those with UC of bladder (UCB), has been comprehensively delineated and associated with pathogenetic mechanisms and treatment preferences, the genomic characterization of upper tract UC (UTUC) has yet to be fully elucidated.
A total of 131 Chinese UTUC (74 renal pelvis & 57 ureter) and 118 UCB patients were enrolled in the present study, and targeted next-generation sequencing (NGS) of 618 cancer-associated genes were conducted to exhibit the profile of somatic and germline alterations. The COSMIC database, including 30 mutational signatures, were utilized to evaluate the mutational spectrums. Moreover, TCGA-UCB, MSKCC-UCB, and MSKCC-UTUC datasets were retrieved for preforming genomic alterations (GAs) comparison analysis between Western and Chinese UC patients.
In our cohort, 93.98% and 56.63% of UC patients were identified with oncogenic and actionable somatic alterations, respectively. Meanwhile, 11.24% of Chinese UC patients (of 14.50% and 7.63% of UTUC and UCB cases, respectively) were identified to harbor a total of 32 pathogenic/likely-pathogenic germline variants in 22 genes, with DNA damage repair (DDR)-associated
(1.20%) and
(1.20%) being the most prevalent. Chinese UTUC and UCB patients possessed distinct somatic genomic characteristics, especially with significantly different prevalence in
,
,
,
, and
. In addition, we also found notable differences in the prevalence of
,
,
, and
between renal pelvis and ureter carcinomas. Moreover, 22.90% and 33.90% of UTUC and UCB patients, respectively, had at least one deleterious/likely deleterious alteration in DDR related genes/pathways. Subsequently, mutational signature analysis revealed that UC patients with mutational signature 22, irrespective of UTUC or UCB, consistently had the markedly higher level of tumor mutational burden (TMB), which was proved to be positively correlated with the objective complete/partial response rate in the IMvigor210 cohort. By comparison, Chinese and Western UTUC patients also differed regrading GAs in oncogenic-related genes/pathways, especially in TP53, RTK/RAS, and PI3K pathways; besides, more alterations in WNT pathway but less TP53, RTK/RAS, HIPPO, and PI3K pathways were identified in Chinese UCB.
The in-depth analysis of genomic mutational landscapes revealed distinct pathogenetic mechanisms between Chinese UTUC and UCB, and specific genomic characterizations could identify high risk population of UTUC/UCB and provided information regarding the selection of alternative therapeutic regimens.
Journal Article
Melt-quenched glass formation of a family of metal-carboxylate frameworks
2024
Metal-organic framework (MOF) glasses are an emerging class of glasses which complement traditional inorganic, organic and metallic counterparts due to their hybrid nature. Although a few zeolitic imidazolate frameworks have been made into glasses, how to melt and quench the largest subclass of MOFs, metal carboxylate frameworks, into glasses remains challenging. Here, we develop a strategy by grafting the zwitterions on the carboxylate ligands and incorporating organic acids in the framework channels to enable the glass formation. The charge delocalization of zwitterion-acid subsystem and the densely filled channels facilitate the coordination bonding mismatch and thus reduce the melting temperature. Following melt-quenching realizes the glass formation of a family of carboxylate MOFs (UiO-67, UiO-68 and DUT-5), which are usually believed to be un-meltable. Our work opens up an avenue for melt-quenching porous molecular solids into glasses.
How to melt and quench the largest subclass of MOFs, metal carboxylate frameworks, into glasses is a major challenge. Here, the authors develop a strategy by grafting the zwitterions onto the carboxylate ligands and incorporating organic acids into the framework channels to realize the glass formation.
Journal Article
Civil Aircraft Cabin Lighting Design and Verification
by
Wan, Chong
,
Weng, Dan
,
Tang, Jiaji
in
Aircraft compartments
,
Aircraft design
,
Digital simulation
2022
Regarding the equipment in the cabin of a civil aircraft, the complexity of their shapes, the huge quantity, and the high requirements for engineering experience in cabin lighting design will result in huge change costs when design errors occur. This paper proposes a general cabin lighting design method, summarizes the elements that need to be considered in the cabin lighting design, and completes the cabin lighting design according to the design elements. In addition, the digital simulation method is used for verification during the design process. Finally, the data will be verified on the real sample, which checks the correctness of the design process, and lays the foundation for the future aircraft cabin lighting design and verification.
Journal Article
Assessing the genomic feature of Chinese patients with ampullary adenocarcinoma: potential therapeutic targets
by
Minghui, Dou
,
Zhimin, Geng
,
Chen, Chen
in
1-Phosphatidylinositol 3-kinase
,
Accuracy
,
Actionable alteration
2024
Backgrounds
Ampullary adenocarcinoma (AMPAC) is a rare malignancy, treated as pancreatic or intestinal cancer based on its histologic subtype. Little is known about the genomic features of Chinese patients with AMPAC.
Materials and methods
We enrolled 145 Chinese AMPAC patients in our local cohort and performed a compressive somatic and germline genetic testing using a 156 gene panel. Expression of PD-L1 (clone 28 − 8) was also assessed in tumor specimens from 64 patients.
Results
The frequency of genetic alterations (GAs) in Chinese patients with AMPAC was found to be distinctive, with
TP53
,
KRAS
,
SMAD4
,
APC
,
CTNNB1
,
ARID1A
, and
CDKN2A
emerged as the most frequently mutated genes. Comparing with Western patients, significant differences were observed in the prevalence of
PIK3CA
and
ARID2
. Furthermore, the incidence of MSI-H was lower in the Chinese cohort, with only two patients identified as MSI-H. Conversely, 11 patients (8.27%) had pathogenic/likely pathogenic germline alterations, all of which were in the DNA damage response (DDR) pathway. In our cohort, 34.48% (22/64) of patients exhibited positive PD-L1 expression in tumor cells, and this expression was associated with GAs in
CTNNB1
and
BLM
. Importantly, over three-fourths of Chinese AMPAC patients in our study had at least one actionable GA, with more than one-fifth of them having actionable GAs classified as Level 3. These actionable GAs were primarily involved in the DDR and PI3K pathways. Notably, GAs in the DDR pathway were detected in both Chinese and Western patients, and regardless of their functional impact, these alterations demonstrated enhanced overall survival rates and higher tumor mutational burden (TMB) levels.
Conclusion
These findings underscore the distinct genomic landscape of Chinese AMPAC patients and highlight the potential for targeted therapies based on the identified GAs.
Journal Article