Katsuhiro Ito, MD
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Postdoctoral Fellow
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Postdoctoral Fellow
Biography
Katsuhiro Ito, M.D., is a urologic surgeon-scientist with a research focus on cancer immunology and immunotherapy. He received his M.D. from Kyoto University Faculty of Medicine, Japan, and completed his clinical training and board certification in urology through multiple academic and tertiary care hospitals in Japan. He has extensive experience as a practicing urologist, with a clinical background spanning urothelial carcinoma, renal cell carcinoma, and minimally invasive urologic surgery.
Driven by the unmet clinical need in advanced cancer treatment, Dr. Ito transitioned to translational and immunogenomic research. He is currently a Ph.D. candidate at Kyoto University Graduate School of Medicine, where his research focuses on identifying biomarkers and therapeutic targets for immune checkpoint blockade by integrating clinical outcomes with genomic and transcriptomic data. His doctoral work includes large-scale analyses of molecular subtypes of clear cell renal cell carcinoma and studies of circulating tumor-reactive T cells in non-small cell lung cancer.
Dr. Ito has led projects that revealed subtype-specific immune microenvironments and resistance mechanisms to immunotherapy, as well as the identification and validation of novel circulating T cell biomarkers using single-cell RNA sequencing and flow cytometry. His research expertise spans immunogenomics, single-cell and spatial transcriptomics, and functional immunology, including antigen-specific T cell assays, TCR-engineered T cells, patient-derived organoids, and in vivo mouse models.
Since 2025, Dr. Ito has been a postdoctoral associate at the Yale Cancer Center, Yale School of Medicine. In the Braun Lab, he applies integrative computational and experimental approaches to elucidate mechanisms of immunotherapy efficacy and resistance, with the goal of advancing biomarker-driven and personalized immunotherapy for renal cell carcinoma.
Departments & Organizations
- All Institutions
Education & Training
- Clinical Fellow
- Kyoto University (2017)
- Senior Resident
- Tenri Hospital (2016)
- Junior Resident
- Tenri Hospital (2013)
- MD
- Kyoto University, Faculty of Medicine (2011)
Research
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Overview
Medical Research Interests
Public Health Interests
ORCID
0000-0002-6322-9190
Research at a Glance
Publications Timeline
Research Interests
Immune Checkpoint Inhibitors
Carcinoma, Renal Cell
Publications
2026
Phenotype of circulating tumor-reactive T cells predicts immune checkpoint inhibitor response in non-small cell lung cancer
Ito K, Iida K, Hirano T, Man Long Leong M, Morii K, Menju T, Date H, Ozasa H, Yoshida H, Hirai T, Kawashima S, Aoyama K, Saeki Y, Inozume T, Kobayashi T, Chamoto K, Yaguchi T. Phenotype of circulating tumor-reactive T cells predicts immune checkpoint inhibitor response in non-small cell lung cancer. Nature Communications 2026, 17: 2856. PMID: 41702949, PMCID: PMC13022356, DOI: 10.1038/s41467-026-69680-x.Peer-Reviewed Original ResearchAltmetricMeSH Keywords and ConceptsConceptsImmune checkpoint inhibitorsTumor-reactive T cellsNon-small cell lung carcinomaAssociated with therapeutic outcomesPeripheral bloodT cellsTumor infiltrationEfficacy of immune checkpoint inhibitorsOutcomes of immune checkpoint inhibitorsPeripheral CD8+ T cellsImmune checkpoint inhibitor responsePD-1 blockade therapyNon-small cell lung cancerCD8+ T cellsT-cell receptor (TCR) sequencingICI-treated cohortCheckpoint inhibitor responseLow expressionCell lung carcinomaCell lung cancerProgenitor-like phenotypeMouse tumor modelsStem-like phenotypeFlow cytometric analysisSingle-cell RNAActive aldehydes accelerate CD8+ T cell exhaustion by metabolic alteration in the tumor microenvironment
Haku Y, Kitaoka K, Ichimaru K, Hirano T, Wang J, Sonomura K, Maruo A, Hirose S, Wang Y, Ito K, Kozuki T, Yurimoto K, Kiyono M, Kosako H, Menju T, Date H, Kobayashi T, Omori K, Yaguchi T, Honjo T, Chamoto K. Active aldehydes accelerate CD8+ T cell exhaustion by metabolic alteration in the tumor microenvironment. Nature Immunology 2026, 27: 281-294. PMID: 41501155, DOI: 10.1038/s41590-025-02370-w.Peer-Reviewed Original ResearchCitationsAltmetricMeSH Keywords and ConceptsConceptsT cell exhaustionCD8+ T cellsT cellsPD-1Fatty acid oxidationCD8+ T cell exhaustionCD8+ T cell differentiationFatty acid oxidation impairmentPD-1 blockadePD-1 expressionPD-1 signalingMetabolic imbalanceT cell differentiationAntitumor immunityTumor microenvironmentVicious cycleCD8Lipid peroxidationMetabolic alterationsProducts of lipid peroxidationMitochondrial fatty acid oxidationInhibitor of lipid peroxidationTumorFatty acid oxidation enzymesMetabolic balance
2025
Urothelial collective-gliding response acts as a toll-like receptor 4-associated defense mechanism
Zhang N, Sano T, Ito K, Ito S, Ikeuchi R, Takada H, Nakamura K, Sakatani T, Hamada A, Takeda M, Murakami K, Kita Y, Sumiyoshi T, Goto T, Saito R, Ogawa O, Matsuda M, Kobayashi T. Urothelial collective-gliding response acts as a toll-like receptor 4-associated defense mechanism. IScience 2025, 28: 113553. PMID: 41079633, PMCID: PMC12508895, DOI: 10.1016/j.isci.2025.113553.Peer-Reviewed Original ResearchAltmetricConceptsCollective cell migrationToll-like receptor 4Tumor growthDefense mechanismsEscherichia coliRecurrent non-muscle invasive bladder cancerNon-muscle invasive bladder cancerCell-to-cell cohesionMatrix metalloproteinase (MMP)-8Bladder cancer cellsIntegrin signalingInvasive bladder cancerMature epithelial cellsResponse to external stimuliCell migrationPotential therapeutic strategyIntravesical instillationUPECCancer cellsBladder disordersEndoscopic resectionExtracellular matrixBladder infectionBladder cancerReceptor 4Assessing Response Durability and Survival After Second‐Line Pembrolizumab in Advanced Urothelial Carcinoma: A Multicenter Validation of a Risk Model
Salah S, Ito K, Kita Y, Kobayashi T, Alshangiti A, Azam F, Abdeljalil O, Ibnshamsah F, Alselwi W, Horani M, Abu Hijlih R, Abuhijla F, Alrabi K. Assessing Response Durability and Survival After Second‐Line Pembrolizumab in Advanced Urothelial Carcinoma: A Multicenter Validation of a Risk Model. International Journal Of Urology 2025, 32: 1569-1575. PMID: 40679106, DOI: 10.1111/iju.70178.Peer-Reviewed Original ResearchCitationsMeSH Keywords and ConceptsConceptsSecond-line pembrolizumabTime to progressionPoor-risk groupOverall survivalUrothelial carcinomaMedian durationResponse durabilityImpact of risk groupInferior time to progressionMedian duration of responseRisk groupsAdvanced urothelial carcinomaPerformance status >Metastatic urothelial carcinomaDuration of responseKaplan-Meier methodMultivariate Cox regressionAdvanced UCMedian OSLiver metastasesPoor riskOS timeValidation cohortPembrolizumabResponse durationRisk Stratification for the Prognosis of Patients With pT3aN0M0 Clear Cell Renal Cell Carcinoma
Koterazawa S, Sumiyoshi T, Ito K, Masui K, Igarashi A, Inoue K, Ito N, Shibasaki N, Takuma T, Ueda M, Yamane T, Maekawa K, Kanamaru S, Hoshiyama A, Kanno T, Sugino Y, Hiramatsu K, Yoshida T, Koike S, Okubo K, Araki H, Masuda N, Nishizawa H, Yatsuda J, Saito R, Akamatsu S, Yamasaki T, Kamba T, Kobayashi T. Risk Stratification for the Prognosis of Patients With pT3aN0M0 Clear Cell Renal Cell Carcinoma. Clinical Genitourinary Cancer 2025, 23: 102400. PMID: 40744829, DOI: 10.1016/j.clgc.2025.102400.Peer-Reviewed Original ResearchMeSH Keywords and ConceptsConceptsDisease-free survivalInternational Metastatic RCC Database ConsortiumClear cell renal cell carcinomaCell renal cell carcinomaRenal cell carcinomaPostoperative recurrenceCell carcinomaFactors associated with poor disease-free survivalDisease-free survival ratesPoor disease-free survivalShorter disease-free survivalMultivariable Cox proportional hazards regressionTumor size >Nuclear grade 3Median Follow-UpKaplan-Meier methodPrognosis of patientsCox proportional hazards regressionArea under the curvePostoperative recurrence riskLow-risk groupHigh-risk groupProportional hazards regressionHigh-risk categoryAdjuvant immunotherapyThe impact of primary tumor resection on survival outcomes in de novo metastatic urothelial carcinoma patients: A multicenter retrospective study.
Abdeljalil O, Kobayashi T, Ito K, Kita Y, Alshangiti A, Azam F, Stecca C, Qudaih A, Ibnshamsah F, Alselwi W, Salah S. The impact of primary tumor resection on survival outcomes in de novo metastatic urothelial carcinoma patients: A multicenter retrospective study. Journal Of Clinical Oncology 2025, 43: e16557-e16557. DOI: 10.1200/jco.2025.43.16_suppl.e16557.Peer-Reviewed Original ResearchConceptsMetastatic urothelial carcinomaEastern Cooperative Oncology GroupPrimary tumor sitePredictors of OSFirst-line chemotherapyOverall survivalResponse to chemotherapyPrimary tumorUnivariate analysisLung metastasesTumor siteSurvival outcomesMultivariate analysisIndependent predictorsRetrospective cohortEastern Cooperative Oncology Group PS 0Impact of primary tumor resectionResponse to first-line chemotherapyDe novo metastatic diseaseMetastatic urothelial carcinoma patientsPredictors of superior OSSurvival outcomes of patientsCohort of ptsPrimary tumor resectionMulticenter retrospective analysisICOS+CD4 T cells define a high susceptibility to anti-PD-1 therapy-induced lung pathogenesis
Yokoi M, Murakami K, Yaguchi T, Chamoto K, Ozasa H, Yoshida H, Shirakashi M, Ito K, Komohara Y, Fujiwara Y, Yano H, Ogimoto T, Hira D, Terada T, Hirai T, Tsukamoto H. ICOS+CD4 T cells define a high susceptibility to anti-PD-1 therapy-induced lung pathogenesis. JCI Insight 2025, 10: e186483. PMID: 40198121, PMCID: PMC12128994, DOI: 10.1172/jci.insight.186483.Peer-Reviewed Original ResearchCitationsAltmetricMeSH Keywords and ConceptsMeSH KeywordsAgingAnimalsB-LymphocytesCD4-Positive T-LymphocytesDisease Models, AnimalFemaleImmune Checkpoint InhibitorsImmunotherapyInducible T-Cell Co-Stimulator LigandInducible T-Cell Co-Stimulator ProteinInterleukin-21InterleukinsLungLymphocyte ActivationMiceMice, Inbred C57BLProgrammed Cell Death 1 ReceptorConceptsAnti-PD-(L)1 therapyImmune-related adverse eventsAnti-PD-(L)1CD4+ T cellsT cellsAged miceAdoptive transferImmune-related adverse events’ management.Administration of IL-21Pathogenic CD4+ T cellsSingle-cell transcriptomicsAged host environmentICOS-ICOSL interactionLung-infiltrating cellsTCR-deficient miceInfiltration of TT cell activationAberrant immune responseB cell differentiationLocal administrationIrAE incidenceTherapy-inducedCancer immunotherapyIL-21Lung toxicityImpact of lymph node dissection during surgery on the efficacy of pembrolizumab in patients with metastatic urothelial carcinoma
Kanno T, Ito K, Kita Y, Mochizuki T, Sano T, Yokomizo A, Abe T, Tsuchihashi K, Tatarano S, Inokuchi J, Takahashi A, Matsui Y, Nishiyama H, Kitamura H, Saito R, Kobayashi T, Group T. Impact of lymph node dissection during surgery on the efficacy of pembrolizumab in patients with metastatic urothelial carcinoma. International Journal Of Urology 2025, 32: 593-597. PMID: 39930591, DOI: 10.1111/iju.70002.Peer-Reviewed Original ResearchCitationsMeSH Keywords and ConceptsMeSH KeywordsAgedAged, 80 and overAntibodies, Monoclonal, HumanizedAntineoplastic Agents, ImmunologicalCarcinoma, Transitional CellCystectomyFemaleHumansJapanLymph Node ExcisionLymphatic MetastasisMaleMiddle AgedNeoplasm Recurrence, LocalRetrospective StudiesSurvival RateTreatment OutcomeUrinary Bladder NeoplasmsConceptsLymph node dissectionEfficacy of pembrolizumabImpact of lymph node dissectionPrimary tumor resectionOverall survivalUrothelial carcinomaMetastatic UCNode dissectionTumor resectionUC treated with pembrolizumabAssociated with worse OSMultivariate Cox regression analysisNon-metastatic UCMetastatic urothelial carcinomaPredictors of OSAssociated with OSCox regression analysisRadical surgeryLiver metastasesRecurrent lesionsPrimary endpointJapanese cohort studyNo significant differencePembrolizumabRetrospective studyDeterminants of health-related quality of life in patients undergoing medical expulsion therapy for acute renal colic
Ito K, Takahashi T, Koterazawa S, Somiya S, Haitani T, Kanno T, Higashi Y, Yamada H. Determinants of health-related quality of life in patients undergoing medical expulsion therapy for acute renal colic. Urologia Journal 2025, 92: 209-215. PMID: 39902749, DOI: 10.1177/03915603251316740.Peer-Reviewed Original ResearchCitationsMeSH Keywords and ConceptsConceptsMedical expulsive therapyQuality of lifeRenal colic attacksAcute renal colicExpulsive therapyPain intensityRenal colicColic attacksDeterminants of health-related quality of lifeCumulative incidenceUreteral stonesAssociated with EQ-5D scoresProximal stonesAssociated with worse QOLHealth-related quality of lifeDeterminants of quality of lifeWorse quality of lifeHigher pain intensityMaximum pain intensityEuroQol-5 DimensionsEQ-5D scoresEuroQol-5Stone passageEQ-5DStone location
2024
2008P Assessing response durability and survival after second-line pembrolizumab in advanced urothelial carcinoma: A multicenter validation of a risk model
Salah S, Kobayashi T, Ito K, Kita Y, Horani M, Alshangiti A, Abu Hijlih R, Sammour M, Abuhijla F, Al-Rabi K. 2008P Assessing response durability and survival after second-line pembrolizumab in advanced urothelial carcinoma: A multicenter validation of a risk model. Annals Of Oncology 2024, 35: s1159. DOI: 10.1016/j.annonc.2024.08.2094.Peer-Reviewed Original Research
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