2024
Spatially resolved niche and tumor microenvironmental alterations in gastric cancer peritoneal metastases
Zhao J, Ong C, Srivastava S, Chia D, Ma H, Huang K, Sheng T, Ramnarayanan K, Ong X, Tay S, Hagihara T, Tan A, Teo M, Tan Q, Ng G, Tan J, Ng M, Gwee Y, Walsh R, Law J, Shabbir A, Kim G, Tay Y, Her Z, Leoncini G, Teh B, Hong J, Tay R, Teo C, Dings M, Bijlsma M, Lum J, Mathur S, Pietrantonio F, Blum S, van Laarhoven H, Klempner S, Yong W, So J, Chen Q, Tan P, Sundar R. Spatially resolved niche and tumor microenvironmental alterations in gastric cancer peritoneal metastases. Gastroenterology 2024 PMID: 39147169, DOI: 10.1053/j.gastro.2024.08.007.Peer-Reviewed Original ResearchPeritoneal metastasisTumor microenvironmentPrimary tumorTranscoelomic metastasisGastric cancerExpression of therapeutic targetsAssociated with poor prognosisGastric cancer peritoneal metastasisAssociated with increased riskHumanized mouse modelTherapeutic targetComprehensive multi-omics analysisTumor microenvironment signaturesTumor microenvironment alterationsDigital spatial profilingInvestigate molecular alterationsWhole-exome sequencingMatched normal tissuesStromal infiltrationComprehensive molecular characterizationLiver metastasesImmune compositionFGFR2b expressionImprove patient outcomesPredictive markerAbstract 1497: Humanized mouse model unveils niche conditioning in gastric cancer peritoneal metastasis
Zhao J, Chia D, Her Z, Ma H, Ong X, Tay S, So J, Chen Q, Tan P, Sundar R. Abstract 1497: Humanized mouse model unveils niche conditioning in gastric cancer peritoneal metastasis. Cancer Research 2024, 84: 1497-1497. DOI: 10.1158/1538-7445.am2024-1497.Peer-Reviewed Original ResearchHumanized mouse modelPeritoneal metastasisGastric cancer peritoneal metastasisPrimary tumorAdjacent peritoneumMouse modelTranscoelomic metastasisHost immune systemEpithelial mesenchymal transitionOrthotopic modelAmerican Association for Cancer Research annual meetingsGastric cancerNovel humanized mouse modelNSG modelImmune systemExpression of M2 macrophagesFunctional human cellsPeritoneal disseminationT-regsOrthotopic inoculationDendritic cellsNOD-SCIDImmune infiltrationPeritoneal samplesNormal peritoneumOncogenic aberrations in primary gastric cancer tumors to predict metachronous peritoneal metastasis.
Zhao J, Huang K, Chia D, Law J, Tan A, So J, Tan P, Sundar R. Oncogenic aberrations in primary gastric cancer tumors to predict metachronous peritoneal metastasis. Journal Of Clinical Oncology 2024, 42: 392-392. DOI: 10.1200/jco.2024.42.3_suppl.392.Peer-Reviewed Original ResearchPeritoneal metastasisPrimary tumorWhole-exome sequencingARID1A mutationsGastric cancerMedian follow-up durationGS tumorsPrimary tumors of patientsMetachronous peritoneal metastasesAssociated with PMFollow-up durationGastric cancer tumorsPoor survival outcomesPrimary GC tumorsMetachronous PMAdvanced tumorsCDH1 mutationsSurgical resectionOncogenic aberrationsSurvival outcomesClinical outcomesPoor prognosisFollowed-upProspective cohortRHOA mutations
2022
Single-Cell Atlas of Lineage States, Tumor Microenvironment, and Subtype-Specific Expression Programs in Gastric CancerSingle-Cell Atlas of Gastric Cancer Subtypes
Kumar V, Ramnarayanan K, Sundar R, Padmanabhan N, Srivastava S, Koiwa M, Yasuda T, Koh V, Huang K, Tay S, Ho S, Tan A, Ishimoto T, Kim G, Shabbir A, Chen Q, Zhang B, Xu S, Lam K, Lum H, Teh M, Yong W, So J, Tan P. Single-Cell Atlas of Lineage States, Tumor Microenvironment, and Subtype-Specific Expression Programs in Gastric CancerSingle-Cell Atlas of Gastric Cancer Subtypes. Cancer Discovery 2022, 12: 670-691. PMID: 34642171, PMCID: PMC9394383, DOI: 10.1158/2159-8290.cd-21-0683.Peer-Reviewed Original ResearchConceptsPatient-derived organoidsPlasma cell proportionsGastric cancer subtypesLineage statePredictors of poor clinical prognosisCancer subtypesSingle-cell atlasCell proportionCancer-associated fibroblasts' subtypesCell populationsDiffuse-type tumorsPoor clinical prognosisIn vivo modelsComprehensive single-cell atlasPrimary tumorHistological subtypesRNA-sequencing cohortsTumor microenvironmentClinical stageClinical prognosisGastric malignancyTumor ecosystemGastric cancerCancer heterogeneityTumor
2020
Spatial profiling of gastric cancer patient-matched primary and locoregional metastases reveals principles of tumour dissemination
Sundar R, Liu D, Hutchins G, Slaney H, Silva A, Oosting J, Hayden J, Hewitt L, Ng C, Mangalvedhekar A, Ng S, Tan I, Tan P, Grabsch H. Spatial profiling of gastric cancer patient-matched primary and locoregional metastases reveals principles of tumour dissemination. Gut 2020, 70: 1823-1832. PMID: 33229445, PMCID: PMC8458060, DOI: 10.1136/gutjnl-2020-320805.Peer-Reviewed Original ResearchConceptsPrimary gastric cancerLymph node metastasisPrimary tumorGastric cancerIntratumour heterogeneityNode metastasisMatched lymph node metastasesRegional lymph node metastasisMultiplex ligation-dependent probe amplificationLigation-dependent probe amplificationPatient-matchedProgressive genomic changesDNA copy number profilesEndoscopic mucosal biopsiesCopy number profilesTherapeutically relevant genesLocoregional metastasesTumor disseminationResected samplesTargeted therapyHistomorphological phenotypesProbe amplificationBiomarker testingClinical trialsNanoString results