Katsuhiro Ito, MD, PhD
Cards
About
Titles
Postdoctoral Fellow
About
Copy Link
Titles
Postdoctoral Fellow
Biography
Katsuhiro Ito, M.D., Ph.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 received his Ph.D. 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.
Education & Training
- PhD
- Kyoto University, Department of Urology, Graduate School of Medicine (2025)
- Clinical Fellow
- Kyoto University (2017)
- Senior Resident
- Tenri Hospital (2016)
- Junior Resident
- Tenri Hospital (2013)
- MD
- Kyoto University, Faculty of Medicine (2011)
Research
Copy Link
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
Featured Publications
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 ResearchThis study investigates circulating tumor-reactive T cells in lung cancer, showing their unique markers and dynamic changes linked to immune therapy outcomes.Active 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 balanceICOS+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 locationReal‐world outcomes of pembrolizumab for platinum‐refractory advanced urothelial carcinoma: Efficacy, safety, and evidence for trial‐unfit patients
Ito K, Kita Y, Kobayashi T. Real‐world outcomes of pembrolizumab for platinum‐refractory advanced urothelial carcinoma: Efficacy, safety, and evidence for trial‐unfit patients. International Journal Of Urology 2022, 30: 696-703. PMID: 36482843, DOI: 10.1111/iju.15101.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsCitationsMeSH Keywords and ConceptsConceptsUrothelial carcinomaSurvival benefitPlatinum-refractory advanced urothelial carcinomaWell-designed phase III trialsPatient characteristicsProgrammed cell death 1Advanced urothelial carcinomaBenefit of pembrolizumabOutcomes of pembrolizumabCell death 1Real-world outcomesTrial-ineligible patientsPoor performance statusPhase III trialsClinical risk factorsDeath-1III trialsPerformance statusPembrolizumabOlder patientsRisk factorsPatientsMonoclonal antibodiesClinical practiceEligibility criteriaDiscontinuation of pembrolizumab for advanced urothelial carcinoma without disease progression: Nationwide cohort study
Ito K, Kita Y, Yokomizo A, Miki J, Yoshio Y, Matsumoto H, Segawa T, Karashima T, Nishiyama N, Imai K, Suekane S, Nagasawa S, Higashi S, Nishiyama H, Kitamura H, Kobayashi T. Discontinuation of pembrolizumab for advanced urothelial carcinoma without disease progression: Nationwide cohort study. Cancer Medicine 2022, 12: 2325-2332. PMID: 35864744, PMCID: PMC9939199, DOI: 10.1002/cam4.5057.Peer-Reviewed Original ResearchCitationsMeSH Keywords and ConceptsConceptsRelapse-free survivalMetastatic urothelial carcinomaComplete responsePartial responseUrothelial carcinomaTreatment durationAnti-programmed death-1 monoclonal antibodyPlatinum-refractory metastatic urothelial carcinomaTreatment of metastatic urothelial carcinomaEastern Cooperative Oncology Group performance statusAdvanced urothelial carcinomaDiscontinuation of pembrolizumabFavorable survival outcomesTreatment-free survivalOptimal treatment durationAssociated with significantly better RFSNationwide cohort studyHigher hemoglobin levelsPembrolizumab respondersOS ratesStable diseaseOS differencePerformance statusProgressive diseaseSurvival outcomesPembrolizumab for treating advanced urothelial carcinoma in patients with impaired performance status: Analysis of a Japanese nationwide cohort
Ito K, Kobayashi T, Kojima T, Hikami K, Yamada T, Ogawa K, Nakamura K, Sassa N, Yokomizo A, Abe T, Tsuchihashi K, Tatarano S, Inokuchi J, Tomida R, Fujiwara M, Takahashi A, Matsumoto K, Shimizu K, Araki H, Kurahashi R, Osaki Y, Tashiro Y, Uegaki M, Ogawa O, Kitamura H, Nishiyama H. Pembrolizumab for treating advanced urothelial carcinoma in patients with impaired performance status: Analysis of a Japanese nationwide cohort. Cancer Medicine 2021, 10: 3188-3196. PMID: 33931987, PMCID: PMC8124127, DOI: 10.1002/cam4.3863.Peer-Reviewed Original ResearchCitationsAltmetricMeSH Keywords and ConceptsConceptsNeutrophil-lymphocyte ratioOverall response rateAdvanced urothelial carcinomaImpaired performance statusOverall survivalPerformance statusUrothelial carcinomaPS 0Liver metastasesRisk factorsMedian overall survival of patientsEastern Cooperative Oncology Group PSOverall survival of patientsMultivariate Cox regression analysisBenefit of pembrolizumabPlatinum-refractory UCMedian overall survivalRetrospective nationwide cohort studyEfficacy of pembrolizumabMedian OS timeAssociated with OSCox regression analysisNationwide cohort studyPembrolizumab therapyOS time
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 ResearchCitationsAltmetricConceptsCollective 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 duration
Get In Touch
Copy Link
Contacts
Social Media