Annabella Shewarega, MD
Hospital ResidentAbout
Research
Publications
2025
Noninvasive Tumor Profiling: Quantitative Contrast-Enhanced MRI Markers Predict PD-L1 and CTNNB1 Status in Hepatocellular Carcinoma.
Matuschewski N, Sobirey R, Revzin M, Zeevi T, Gross M, Kasolowsky V, Shewarega A, Meister E, Kao T, Tefera J, Bousabarah K, Batra R, Strazzabosco M, Lin M, Gebauer B, Savic L, Duncan J, Madoff D, Zhang X, Chapiro J. Noninvasive Tumor Profiling: Quantitative Contrast-Enhanced MRI Markers Predict PD-L1 and CTNNB1 Status in Hepatocellular Carcinoma. Radiology 2025, 316: e242750. PMID: 40762840, PMCID: PMC12405729, DOI: 10.1148/radiol.242750.Peer-Reviewed Original ResearchPortal and Hepatic Vein Embolization versus Portal Venous Embolization Alone in Cirrhotic and Noncirrhotic Swine: A Pilot Study
Tefera J, Kuhn T, Matuschewski N, Meister E, Nguyenová J, Kao T, Mutonga M, Bitar R, Kahl V, Zhang X, Shewarega A, Chapiro J, Madoff D. Portal and Hepatic Vein Embolization versus Portal Venous Embolization Alone in Cirrhotic and Noncirrhotic Swine: A Pilot Study. Journal Of Vascular And Interventional Radiology 2025, 36: 1042-1050.e2. PMID: 40043833, DOI: 10.1016/j.jvir.2025.02.028.Peer-Reviewed Original ResearchPost-embolizationCirrhotic groupPortal venous embolizationHepatic vein embolizationPortal venous phaseNon-cirrhotic groupStudent's t-testFLR hypertrophyFLR increaseVein embolizationVenous phaseEffects of PVELiver volumeCT scanVenous embolizationEmbolizationCirrhotic liverFour-week intervalsWeeksT-testFLRLiverPilot studyYorkshire pigsPVE
2024
Molecular MRI of T-cell immune response to cryoablation in immunologically hot vs. cold hepatocellular carcinoma
Santana J, Shewarega A, Nam D, Duncan J, Madoff D, Hyder F, Coman D, Chapiro J. Molecular MRI of T-cell immune response to cryoablation in immunologically hot vs. cold hepatocellular carcinoma. JHEP Reports 2024, 7: 101294. PMID: 40028344, PMCID: PMC11870164, DOI: 10.1016/j.jhepr.2024.101294.Peer-Reviewed Original ResearchT cell infiltrationHepatocellular carcinomaRadiological-pathological correlationImaging Mass CytometryImmune responseT1-weighted MRITumor-infiltrating CD8+ T lymphocytesAnti-tumor immune responseCD8+ T lymphocytesIncreased T lymphocyte infiltrationImaging biomarkersNon-immunogenic tumorsSystemic lymph nodesT lymphocyte infiltrationMurine tumor modelsImmune cell typesLocal tumor therapyPrimary liver cancerNon-invasive imaging biomarkerTesla MRI scannerInduce liver cirrhosisImmunogenic tumorsLocoregional therapySystemic immunotherapyHCC lesionsInvestigating synergy between beta-blockers and transarterial chemoembolization in the treatment of hepatocellular carcinoma: preliminary data from a propensity matched analysis
Mutonga M, Shewarega A, Gross M, Kahl V, Madoff D. Investigating synergy between beta-blockers and transarterial chemoembolization in the treatment of hepatocellular carcinoma: preliminary data from a propensity matched analysis. Clinical Imaging 2024, 115: 110283. PMID: 39278042, DOI: 10.1016/j.clinimag.2024.110283.Peer-Reviewed Original ResearchBeta-blockersTumor responseImaging timepointsTumor sizeEtiology of liver diseaseAssociated with high mortalityTransplant free survivalTransplant-free survivalTreatment of hepatocellular carcinomaFavorable clinical outcomesChild-Pugh scoreFirst-line treatmentBeta-blocker groupPredictors of survivalCox regression analysisTreatment of HCCStudent's t-testFree survivalTransarterial chemoembolizationChi-square testPost-TACETACE treatmentPugh scoreSurvival predictorsAdjunctive useHigh‐resolution extracellular pH imaging of liver cancer with multiparametric MR using Deep Image Prior
Dong S, Shewarega A, Chapiro J, Cai Z, Hyder F, Coman D, Duncan J. High‐resolution extracellular pH imaging of liver cancer with multiparametric MR using Deep Image Prior. NMR In Biomedicine 2024, 37: e5145. PMID: 38488205, DOI: 10.1002/nbm.5145.Peer-Reviewed Original ResearchDeep Image PriorU-NetUnsupervised deep learning techniquesU-Net parametersDeep learning techniquesHigh-resolution ground truthU-Net architectureSuper-resolution imagingImage priorsSuper-ResolutionGround truthMean absolute errorDeepSpatial resolutionPostprocessing methodDeep imagingAbsolute errorImagesAnatomical MR imagesMR spectroscopic imagingAnatomical informationSpectroscopic imagingInformationAcquisition timeErrorEffect of Incomplete Cryoablation and Matrix Metalloproteinase Inhibition on Intratumoral CD8+ T-Cell Infiltration in Murine Hepatocellular Carcinoma.
Shewarega A, Santana J, Nam D, Berz A, Tefera J, Kahl V, Mishra S, Coman D, Duncan J, Roberts S, Wetter A, Madoff D, Chapiro J. Effect of Incomplete Cryoablation and Matrix Metalloproteinase Inhibition on Intratumoral CD8+ T-Cell Infiltration in Murine Hepatocellular Carcinoma. Radiology 2024, 310: e232365. PMID: 38349244, PMCID: PMC10902598, DOI: 10.1148/radiol.232365.Peer-Reviewed Original ResearchConceptsT cell infiltrationCD8+ T cellsMatrix metalloproteinase inhibitionT cellsHepatocellular carcinomaMatrix metalloproteinase inhibitorsMatrix metalloproteinasesResidual tumorCXCR3+ CD8+ T cellsCytotoxic CD8+ T cell infiltrationIntratumoral CD8+ T cell infiltrationCD8+ T cell infiltrationCD8+ T cell infiltrationMouse model of hepatocellular carcinomaEarly-stage hepatocellular carcinomaImage-guided tumor ablationUnpaired Student's t testModel of hepatocellular carcinomaFirst-line therapyMurine hepatocellular carcinomaT cell subsetsTumor-associated macrophagesMurine HCC modelLocal immune responseFemale BALB/c mice
2023
Protrieve sheath utilization for capturing supra-filter thrombus during a retrieval of thrombosed and embedded IVC filter
Shewarega A, Powell T, Silin D. Protrieve sheath utilization for capturing supra-filter thrombus during a retrieval of thrombosed and embedded IVC filter. CVIR Endovascular 2023, 6: 52. PMID: 37882904, PMCID: PMC10602975, DOI: 10.1186/s42155-023-00397-4.Peer-Reviewed Original ResearchIVC filtersPulmonary embolismDeep vein thrombosisCase presentationA 54-year-old womanBackgroundInferior vena cavaEmbedded IVC filtersIndwelling IVC filterHigher transfusion requirementsRecurrent pulmonary embolismLower extremity swellingPreventing pulmonary embolismIron deficiency anemiaRisk of thromboembolismIn situ thrombosisRisk of embolismComplex medical historyIVC thrombosisTransfusion requirementsTemporary filterAnticoagulant therapyExtremity swellingVena cavaVein thrombosisGastrointestinal bleedingCase reportHepatic Hypertrophy in Normal and Cirrhotic Livers Following Portal Vein Embolization: Comparative Assessment of 2 Different Embolic Regimens in a Large Animal Model
Kuhn T, Kahl V, Wang Y, Berz A, Shewarega A, Santana J, Antoch G, Chapiro J, Schlachter T, Madoff D. Hepatic Hypertrophy in Normal and Cirrhotic Livers Following Portal Vein Embolization: Comparative Assessment of 2 Different Embolic Regimens in a Large Animal Model. Journal Of Vascular And Interventional Radiology 2023, 34: 2162-2172.e2. PMID: 37634850, DOI: 10.1016/j.jvir.2023.08.024.Peer-Reviewed Original ResearchConceptsPortal vein embolizationFuture liver remnantVein embolizationLiver remnantCirrhotic liverStandardized future liver remnantNon-cirrhotic groupImmune cell infiltrationNon-cirrhotic liverN-butyl cyanoacrylateT-testFemale Yorkshire pigsLarge animal modelLarge animal studiesStudent's t-testCirrhotic groupEmbolized lobeBaseline percentageHepatic hypertrophyCell infiltrationBaseline CTKi-67Preclinical studiesInstitutional Animal CareFLR increaseNon-Invasive Imaging Biomarkers to Predict the Hepatopulmonary Shunt Fraction Before Transarterial Radioembolization in Patients with Hepatocellular Carcinoma
Hamm C, Busch F, Pöhlmann A, Shewarega A, He Y, Schmidt R, Xu H, Wieners G, Gebauer B, Savic L. Non-Invasive Imaging Biomarkers to Predict the Hepatopulmonary Shunt Fraction Before Transarterial Radioembolization in Patients with Hepatocellular Carcinoma. Journal Of Hepatocellular Carcinoma 2023, 10: 27-42. PMID: 36660411, PMCID: PMC9842483, DOI: 10.2147/jhc.s391537.Peer-Reviewed Original ResearchHepatopulmonary shunt fractionArterial phase enhancementTransarterial radioembolizationHepatocellular carcinomaOverall survivalCE-CTShunt fractionTechnetium-99m macroaggregated albuminImaging biomarkersInstitutional review board approvalM macroaggregated albuminIndependent risk factorClinically applicable risk scoreDisease-specific clinical parametersNon-invasive predictorPoor overall survivalReview board approvalNon-invasive imaging biomarkerTumor diameterNon-invasive predictionPoor OSTumor extentVenous invasionClinical parametersRetrospective study
2022
Experimental VX2 Rabbit Liver Tumor Model in Carbon Tetrachloride–Induced Cirrhosis of the Liver
Santana J, Shewarega A, Nam D, Kahl V, Madoff D, Zhang X, Chapiro J. Experimental VX2 Rabbit Liver Tumor Model in Carbon Tetrachloride–Induced Cirrhosis of the Liver. Journal Of Vascular And Interventional Radiology 2022, 34: 404-408.e1. PMID: 36473611, PMCID: PMC11037556, DOI: 10.1016/j.jvir.2022.11.026.Peer-Reviewed Original ResearchConceptsLiver cirrhosisMale New Zealand white rabbitsRabbit liver tumor modelCirrhotic liver backgroundReproducible tumor growthVX2 liver cancerLeft hepatic lobeNew Zealand white rabbitsDuration of treatmentLiver tumor modelCross-sectional imagingVX2 rabbit liver tumor modelZealand white rabbitsHepatic lobeHistopathological evaluationMajor underlying factorHepatic tumorsIntragastric administrationHepatocellular carcinomaLiver tumorsLiver cancerCirrhosisUnmet needTumor growthVX2 tumors