2025
Identifying multi-level social determinants for disparities in survival and patient-reported outcomes in national head and neck cancer trials.
Bai J, Borges M, Nguyen-Tan F, Rosenthal D, Caudell J, Gillison M, Mell L, Bruner D, Yeager K, Eldridge R, Thorstad W, Xu M, Medek S, Echevarria M, Awan M, Shin D, Pugh S, Yom S. Identifying multi-level social determinants for disparities in survival and patient-reported outcomes in national head and neck cancer trials. Journal Of Clinical Oncology 2025, 43: 11066-11066. DOI: 10.1200/jco.2025.43.16_suppl.11066.Peer-Reviewed Original ResearchSocial determinants of healthArea-level social determinants of healthQoL declineTravel burdenDesigning community-based interventionsHead and neck cancerOdds ratioHazard ratioNeighborhood socioeconomic deprivationDeterminants of healthCommunity-based interventionsConfidence intervalsLogistic regression assessed associationsImprove cancer outcomesPatient's zip codeCox proportional hazards regressionPatient-reported outcomesMultivariable Cox proportional hazards regressionProportional hazards regressionSocioeconomic deprivationSocial determinantsHead and neck cancer trialsNon-HispanicCancer outcomesZip codesRacial/Ethnic Differences and Effects of Clinical/Socioeconomic Factors on Time from Diagnosis to Treatment in Pancreatic Cancer
Sridharan A, Dotan E, Dorta M, Vemula N, Handorf E, Deng M, Renning A, Sorice K, Laderman L, Whittington K, Cukierman E, Astsaturov I, Vijayvergia N, Meyer J, Reddy S, Lynch S. Racial/Ethnic Differences and Effects of Clinical/Socioeconomic Factors on Time from Diagnosis to Treatment in Pancreatic Cancer. Journal Of Gastrointestinal Cancer 2025, 56: 67. PMID: 39954184, PMCID: PMC11829832, DOI: 10.1007/s12029-025-01188-x.Peer-Reviewed Original ResearchConceptsSocioeconomic statusHazard ratioConfidence intervalsSocioeconomic status populationsCancer CenterComprehensive cancer centerDiagnosis to first treatmentPatient-level variablesAcademic cancer centerCox proportional hazards regressionReceipt of chemotherapyMultivariable Cox proportional hazards regressionProportional hazards regressionT2TCancer disparitiesNeighborhood deprivationRace/ethnic disparitiesDisparity indicatorsRacial/Ethnic DifferencesHospital settingEffects of racePatient raceDiagnosis to treatmentUS CensusMetastatic PDAC
2024
Anticoagulation Alone vs Anticoagulation Plus Aspirin or DAPT Following Left Atrial Appendage Occlusion
Reinhardt S, Gibson D, Hsu J, Kapadia S, Yeh R, Price M, Piccini J, Nair D, Christen T, Allocco D, Freeman J. Anticoagulation Alone vs Anticoagulation Plus Aspirin or DAPT Following Left Atrial Appendage Occlusion. Journal Of The American College Of Cardiology 2024, 84: 889-900. PMID: 39197978, DOI: 10.1016/j.jacc.2024.05.067.Peer-Reviewed Original ResearchConceptsLeft atrial appendage occlusionRate of adverse eventsAdverse eventsLAA closure deviceAppendage occlusionAntithrombotic strategiesP2Y<sub>12</sub> inhibitorsDays of follow-upMultivariable Cox proportional hazards regressionClosure deviceRisk of adverse eventsCox proportional hazards regressionWatchman FLX deviceDual antiplatelet therapyDevice-related thrombusProportional hazards regressionStroke/transient ischemic attackAntithrombotic regimensFLX deviceAntiplatelet therapyDOACsGroup patientsFollow-upMultivariate analysisHazards regressionUrine Biomarkers of Kidney Tubule Health and Risk of Incident CKD in Persons Without Diabetes: The ARIC, MESA, and REGARDS Studies
Amatruda J, Katz R, Rebholz C, Sarnak M, Gutierrez O, Schrauben S, Greenberg J, Coresh J, Cushman M, Waikar S, Parikh C, Schelling J, Jogalekar M, Bonventre J, Vasan R, Kimmel P, Ix J, Shlipak M, Consortium C. Urine Biomarkers of Kidney Tubule Health and Risk of Incident CKD in Persons Without Diabetes: The ARIC, MESA, and REGARDS Studies. Kidney Medicine 2024, 6: 100834. PMID: 38826568, PMCID: PMC11141432, DOI: 10.1016/j.xkme.2024.100834.Peer-Reviewed Original ResearchAssociated with incident chronic kidney diseaseIncident chronic kidney diseaseChronic kidney diseaseUrine MCP-1Meta-analysisUrine biomarkersMCP-1A1M concentrationsMultivariable Cox proportional hazards regressionRisk of chronic kidney diseaseRisk of incident chronic kidney diseaseCox proportional hazards regressionIndependent of eGFRPrevalent chronic kidney diseaseCohort of adultsMeta-analysis of resultsA1MLong follow-up periodEarly chronic kidney diseaseFollow-up periodProportional hazards regressionUrine A1MARIC participantsREGARDS studyHealth markersImpact of immunotherapy time-of-day infusion on survival and immunologic correlates in patients with metastatic renal cell carcinoma: a multicenter cohort analysis
Patel J, Woo Y, Draper A, Jansen C, Carlisle J, Innominato P, Lévi F, Dhabaan L, Master V, Bilen M, Khan M, Lowe M, Kissick H, Buchwald Z, Qian D. Impact of immunotherapy time-of-day infusion on survival and immunologic correlates in patients with metastatic renal cell carcinoma: a multicenter cohort analysis. Journal For ImmunoTherapy Of Cancer 2024, 12: e008011. PMID: 38531662, PMCID: PMC10966813, DOI: 10.1136/jitc-2023-008011.Peer-Reviewed Original ResearchConceptsInfusions of immune checkpoint inhibitorsMetastatic renal cell carcinomaProgression-free survivalOverall survivalRenal cell carcinomaCell carcinomaInternational Metastatic RCC Database Consortium risk scoreAssociated with longer progression-free survivalLung cancerGroup BGroup ATime of ICI initiationLonger progression-free survivalNon-small cell lung cancerMultivariable Cox proportional hazards regressionImmune checkpoint inhibitorsPretreatment lactate dehydrogenaseCell lung cancerCox proportional hazards regressionAdaptive immune responsesProportional hazards regressionMulticenter cohort analysisCheckpoint inhibitorsICI initiationMetastatic melanomaRadioresistant Pulmonary Oligometastatic and Oligoprogressive Lesions From Nonlung Primaries: Impact of Histology and Dose-Fractionation on Local Control After Radiation Therapy
Verma N, Laird J, Moore N, Hayman T, Housri N, Peters G, Knowlton C, Jairam V, Campbell A, Park H. Radioresistant Pulmonary Oligometastatic and Oligoprogressive Lesions From Nonlung Primaries: Impact of Histology and Dose-Fractionation on Local Control After Radiation Therapy. Advances In Radiation Oncology 2024, 9: 101500. PMID: 38699671, PMCID: PMC11063223, DOI: 10.1016/j.adro.2024.101500.Peer-Reviewed Original ResearchLocal recurrence-free survivalNon-lung primaryAssociated with higher local recurrence-free survivalProgression-free survivalBiologically Effective DoseLocal controlRadioresistant metastasesOverall survivalPulmonary metastasesPrimary cancerColorectal carcinomaAssociated with superior local controlMultivariate analysisPatients treated with radiotherapyRisk of local recurrenceMedian follow-up timeMultivariable Cox proportional hazards regressionInferior local controlMedian total doseSuperior local controlAssociated with decreased riskImpact of histologyMetastasis-free survivalRecurrence-free survivalLocal failureImmunotherapy utilization in stage IIIA melanoma: less may be more
Frey A, Kerekes D, Khan S, Tran T, Kluger H, Clune J, Ariyan S, Sznol M, Ishizuka J, Olino K. Immunotherapy utilization in stage IIIA melanoma: less may be more. Frontiers In Oncology 2024, 14: 1336441. PMID: 38380358, PMCID: PMC10876869, DOI: 10.3389/fonc.2024.1336441.Peer-Reviewed Original ResearchStage IIIA melanomaHigh-volume centersRisk-adjusted survivalLow-volume centersImmunotherapy utilizationAdjuvant immunotherapyStage IIIATreatment of stage III melanomaAcademic centersMultivariable Cox proportional hazards regressionStage III melanomaNational Cancer DatabaseStage III diseaseFactors associated with receiptCox proportional hazards regressionCompare patient outcomesProportional hazards regressionIII melanomaImmunotherapy receiptReceiving immunotherapyIII diseaseImmunotherapy agentsOverall survivalSurvival benefitAdjuvant treatmentReal-world analysis of two ischaemic stroke and TIA systolic blood pressure goals on 12-month mortality and recurrent vascular events
Sico J, Hu X, Myers L, Levine D, Bravata D, Arling G. Real-world analysis of two ischaemic stroke and TIA systolic blood pressure goals on 12-month mortality and recurrent vascular events. Stroke And Vascular Neurology 2024, 9: 519-529. PMID: 38191185, PMCID: PMC11732840, DOI: 10.1136/svn-2023-002759.Peer-Reviewed Original ResearchTransient ischemic attackSystolic blood pressureVeterans Administration Medical CenterStroke/transient ischemic attackIntensive SBP goalRecurrent vascular eventsCardiovascular eventsVascular eventsSBP goalSBP groupRecurrent stroke/transient ischemic attackMultivariable Cox proportional hazards regressionGoal systolic blood pressureIndex emergency department visitStroke/TIA patientsSystolic blood pressure goalAverage systolic blood pressureLower systolic blood pressureCox proportional hazards regressionBlood pressure goalsRecurrent cerebrovascular eventsRetrospective cohort studyEmergency department visitsProportional hazards regressionSignificant higher risk
2023
Investigating the Relationship between the Dose to the Recto-Vaginal Reference Point and Vaginal Stenosis among Cervical Cancer Patients Treated at a North American Academic Institution
Adefres B, Wallington D, Tien C, Damast S. Investigating the Relationship between the Dose to the Recto-Vaginal Reference Point and Vaginal Stenosis among Cervical Cancer Patients Treated at a North American Academic Institution. International Journal Of Radiation Oncology • Biology • Physics 2023, 117: e501. DOI: 10.1016/j.ijrobp.2023.06.1746.Peer-Reviewed Original ResearchVaginal stenosisDose constraintsMedian doseMultivariable Cox proportional hazards regressionCox proportional hazards regressionCohort median ageAdvanced cervical cancerInterstitial needlesKaplan-Meier methodCervical cancer patientsProportional hazards regressionLog-rank testHR-CTV D90MATERIAL/METHODSImage-guided brachytherapyNorth American academic institutionsLACC patientsPrimary endpointCumulative incidenceOnly patientsPatient demographicsMedian ageCervical cancerCancer patientsSingle institutionSurvival Outcomes for Oligometastatic vs. Polymetastatic Extensive-Stage Small Cell Lung Cancer Following Consolidative Thoracic Radiotherapy
Verma N, Ninia J, Hayman T, Housri N, Peters G, Knowlton C, Campbell A, Park H. Survival Outcomes for Oligometastatic vs. Polymetastatic Extensive-Stage Small Cell Lung Cancer Following Consolidative Thoracic Radiotherapy. International Journal Of Radiation Oncology • Biology • Physics 2023, 117: e68-e69. DOI: 10.1016/j.ijrobp.2023.06.797.Peer-Reviewed Original ResearchLocal recurrence-free survivalProgression-free survivalES-SCLC patientsES-SCLCOligometastatic diseaseOligometastatic patientsImproved OSLung involvementExtensive-stage small-cell lung cancerMultivariable Cox proportional hazards regressionMultivariable Cox regression analysisCox proportional hazards regressionSmall cell lung cancerBilateral lung involvementConsolidative thoracic radiotherapyLimited metastatic burdenMetastasis-directed radiotherapyPlatinum-doublet chemotherapyCox regression analysisMetastasis-free survivalRecurrence-free survivalTime of diagnosisProportional hazards regressionCell lung cancerLog-rank testPrognostic significance of pericardial effusion in systemic sclerosis-associated pulmonary hypertension: analysis from the PHAROS Registry
Luo Y, Gordon J, Xu J, Kolstad K, Chung L, Steen V, Bernstein E, Csuka M, Derk C, Domsic R, Fischer A, Frech T, Goldberg A, Hant F, Hinchcliff M, Horn E, Hummers L, Hsu V, Kafaja S, Khanna D, Molitor J, Saketkoo L, Shapiro L, Silver R, Simms R. Prognostic significance of pericardial effusion in systemic sclerosis-associated pulmonary hypertension: analysis from the PHAROS Registry. Rheumatology 2023, 63: 1251-1258. PMID: 37478347, PMCID: PMC11065440, DOI: 10.1093/rheumatology/kead368.Peer-Reviewed Original ResearchPersistent pericardial effusionPericardial effusionPulmonary hypertensionSSc-PHSystemic sclerosisPrognostic significanceEffusion statusSystemic sclerosis-associated pulmonary hypertensionMultivariable Cox proportional hazards regressionCox proportional hazards regressionKaplan-Meier survival analysisProspective multicentre registryPulmonary Hypertension AssessmentRight heart catheterizationPredictors of survivalMultivariable-adjusted analysesProportional hazards regressionLog-rank testRecognition of OutcomesMulticentre registryPrognosticate survivalHeart catheterizationIndependent predictorsPrognostic impactSerial echocardiograms
2022
Adipose tissue radiodensity and mortality among patients with nonmetastatic breast cancer
Cheng E, Caan BJ, Chen WY, Irwin ML, Prado CM, Cespedes Feliciano EM. Adipose tissue radiodensity and mortality among patients with nonmetastatic breast cancer. Clinical Nutrition 2022, 41: 2607-2613. PMID: 36306565, PMCID: PMC9722634, DOI: 10.1016/j.clnu.2022.09.016.Peer-Reviewed Original ResearchConceptsNonmetastatic breast cancerVisceral adipose tissueBreast cancerBreast cancer prognosisOverall mortalitySpecific mortalityAdipose tissueCancer prognosisTissue radiodensityMultivariable Cox proportional hazards regressionKaiser Permanente Northern CaliforniaCox proportional hazards regressionRole of adiposityBody mass indexProportional hazards regressionBreast cancer survivalNovel prognostic markerThird lumbar vertebraIntegrated healthcare systemNon-Hispanic whitesMultiple cancer typesHazard ratioNonmetastatic patientsPrognostic factorsClinicopathological characteristicsDiet- and Lifestyle‐Based Prediction Models to Estimate Cancer Recurrence and Death in Patients With Stage III Colon Cancer (CALGB 89803/Alliance)
Cheng E, Ou FS, Ma C, Spiegelman D, Zhang S, Zhou X, Bainter TM, Saltz LB, Niedzwiecki D, Mayer RJ, Whittom R, Hantel A, Benson A, Atienza D, Messino M, Kindler H, Giovannucci EL, Van Blarigan EL, Brown JC, Ng K, Gross CP, Meyerhardt JA, Fuchs CS. Diet- and Lifestyle‐Based Prediction Models to Estimate Cancer Recurrence and Death in Patients With Stage III Colon Cancer (CALGB 89803/Alliance). Journal Of Clinical Oncology 2022, 40: 740-751. PMID: 34995084, PMCID: PMC8887946, DOI: 10.1200/jco.21.01784.Peer-Reviewed Original ResearchMeSH KeywordsAgedAntineoplastic Combined Chemotherapy ProtocolsChemotherapy, AdjuvantColonic NeoplasmsDietFemaleFollow-Up StudiesHumansLife StyleMaleMiddle AgedModels, StatisticalMulticenter Studies as TopicNeoplasm Recurrence, LocalNomogramsPrognosisRandomized Controlled Trials as TopicRisk FactorsSurvival RateConceptsStage III colon cancerDisease-free survivalLifestyle factorsSelf-reported dietPathologic featuresColon cancerPathologic characteristicsMultivariable Cox proportional hazards regressionCox proportional hazards regressionAdjuvant chemotherapy trialsProportional hazards regressionPredictive survivalChemotherapy trialsDFS eventsOverall survivalSurvival prediction modelHazards regressionSurvival outcomesVisual nomogramLifestyle habitsPatient outcomesCancer recurrenceLifestyle exposuresPatientsCancer
2021
Association of Syndemic Unhealthy Alcohol Use, Smoking, and Depressive Symptoms on Incident Cardiovascular Disease among Veterans With and Without HIV-Infection
Chichetto NE, Kundu S, Freiberg MS, Koethe JR, Butt AA, Crystal S, So-Armah KA, Cook RL, Braithwaite RS, Justice AC, Fiellin DA, Khan M, Bryant KJ, Gaither JR, Barve SS, Crothers K, Bedimo RJ, Warner A, Tindle HA. Association of Syndemic Unhealthy Alcohol Use, Smoking, and Depressive Symptoms on Incident Cardiovascular Disease among Veterans With and Without HIV-Infection. AIDS And Behavior 2021, 25: 2852-2862. PMID: 34101074, PMCID: PMC8376776, DOI: 10.1007/s10461-021-03327-4.Peer-Reviewed Original ResearchConceptsIncident cardiovascular diseaseUnhealthy alcohol useCardiovascular diseaseDepressive symptomsCVD riskHIV statusAlcohol useMultivariable Cox proportional hazards regressionCases of CVDCox proportional hazards regressionCVD-free participantsHIV-negative veteransProportional hazards regressionHIV-negativeHIV infectionHazards regressionSyndemic conditionsExcess riskRisk factorsDiagnostic codesHigh prevalenceObservational studyBaseline numberGreater riskSmoking
2020
A National Study of Surgically Managed Atypical Pulmonary Carcinoid Tumors
Walters SL, Canavan ME, Salazar MC, Resio BJ, Blasberg JD, Mase V, Boffa DJ. A National Study of Surgically Managed Atypical Pulmonary Carcinoid Tumors. The Annals Of Thoracic Surgery 2020, 112: 921-927. PMID: 33159862, DOI: 10.1016/j.athoracsur.2020.09.029.Peer-Reviewed Original ResearchConceptsAtypical pulmonary carcinoid tumorsPulmonary carcinoid tumorsCarcinoid tumorsCarcinoid patientsAtypical carcinoidStage IMultivariable Cox proportional hazards regressionNon-small cell lung cancerCox proportional hazards regressionAtypical carcinoid patientsTypical pulmonary carcinoidNational Cancer DatabasePredictors of survivalOptimal surgical managementAtypical carcinoid tumorCell lung cancerProportional hazards regressionKaplan-Meier survivalLong-term survivalNodal upstagingSurgical resectionMultivariable analysisSurgical managementHazards regressionLarge tumorsElectrocardiographic ST-T Abnormities Are Associated With Stroke Risk in the REGARDS Study
Sawano M, Yuan Y, Kohsaka S, Inohara T, Suzuki T, Okamura T, Howard G, Howard V, Judd S, Soliman E, Cushman M. Electrocardiographic ST-T Abnormities Are Associated With Stroke Risk in the REGARDS Study. Stroke 2020, 51: 1100-1106. PMID: 32126939, PMCID: PMC7122793, DOI: 10.1161/strokeaha.119.028069.Peer-Reviewed Original ResearchConceptsIschemic strokeREGARDS studyMultivariable Cox proportional hazards regressionIncident coronary artery diseaseCox proportional hazards regressionAge-adjusted incidence ratesCalculate hazard ratiosFuture ischemic strokeIncident ischemic strokeMinnesota ECG ClassificationStroke risk factorsRisk of strokeCoronary artery diseaseProportional hazards regressionCoronary heart diseaseMinor ECG abnormalitiesNonspecific ST-segmentT-wave abnormalitiesIncident strokePrior strokeArtery diseaseHazard ratioStroke riskHazards regressionBaseline ECGAssociation of Race With Disease Expression and Clinical Outcomes Among Patients With Hypertrophic Cardiomyopathy
Eberly LA, Day SM, Ashley EA, Jacoby DL, Jefferies JL, Colan SD, Rossano JW, Semsarian C, Pereira AC, Olivotto I, Ingles J, Seidman CE, Channaoui N, Cirino AL, Han L, Ho CY, Lakdawala NK. Association of Race With Disease Expression and Clinical Outcomes Among Patients With Hypertrophic Cardiomyopathy. JAMA Cardiology 2020, 5: 83-91. PMID: 31799990, PMCID: PMC6902181, DOI: 10.1001/jamacardio.2019.4638.Peer-Reviewed Original ResearchMeSH KeywordsAdultAgedAtrial FibrillationBlack or African AmericanCardiomyopathy, HypertrophicCohort StudiesDeath, Sudden, CardiacDefibrillators, ImplantableFemaleGenetic TestingHealth Services AccessibilityHealthcare DisparitiesHeart FailureHeart SeptumHeart TransplantationHeart-Assist DevicesHumansMaleMiddle AgedMortalityPhenotypeQuality of Health CareStrokeUnited StatesWhite PeopleConceptsNYHA class IIIAssociation of raceVentricular assist device implantationOverall composite outcomeSeptal reduction therapyAssist device implantationHeart failureBlack patientsHypertrophic cardiomyopathyCause mortalityWhite patientsAtrial fibrillationClass IIICardiac transplantationGenetic testingComposite outcomeClinical outcomesDisease expressionDevice implantationReduction therapyNew York Heart Association functional class IIIMultivariable Cox proportional hazards regressionInvasive septal reduction therapySarcomeric Human Cardiomyopathy RegistryImplantable cardioverter-defibrillator therapy
2019
Risk factors and safe contrast volume thresholds for postcontrast acute kidney injury after peripheral vascular interventions
Lee SR, Zhuo H, Zhang Y, Dahl N, Dardik A, Ochoa Chaar CI. Risk factors and safe contrast volume thresholds for postcontrast acute kidney injury after peripheral vascular interventions. Journal Of Vascular Surgery 2019, 72: 603-610.e1. PMID: 31843298, DOI: 10.1016/j.jvs.2019.09.059.Peer-Reviewed Original ResearchMeSH KeywordsAcute Kidney InjuryAgedCanadaContrast MediaDatabases, FactualEndovascular ProceduresFemaleHumansIncidenceKidneyMaleMiddle AgedPatient SafetyPeripheral Arterial DiseaseRadiography, InterventionalRenal Insufficiency, ChronicRetrospective StudiesRisk AssessmentRisk FactorsTreatment OutcomeUnited StatesConceptsAdvanced chronic kidney diseaseChronic kidney diseasePeripheral vascular interventionsStages of CKDPostcontrast acute kidney injuryBaseline kidney functionPC-AKIAcute kidney injuryContrast volumeVolume of contrastRisk factorsKidney injuryCumulative incidenceLimb ischemiaKidney functionVascular interventionsMultivariable Cox proportional hazards regressionCox proportional hazards regressionAcute limb ischemiaLong-term mortalityCritical limb ischemiaNormal kidney functionMultivariable logistic regressionProportional hazards regressionLong-term survivalOutcomes and relapse patterns of stage IB grade 2 or 3 endometrial cancer treated with adjuvant vaginal brachytherapy
Hochreiter A, Kelly JR, Young MR, Litkouhi B, Black JD, Stromberger C, Higgins S, Schwartz PE, Damast S. Outcomes and relapse patterns of stage IB grade 2 or 3 endometrial cancer treated with adjuvant vaginal brachytherapy. International Journal Of Gynecological Cancer 2019, 30: 48-55. PMID: 31722964, DOI: 10.1136/ijgc-2019-000675.Peer-Reviewed Original ResearchConceptsDisease-free survivalLower uterine segment involvementPelvic recurrence-free survivalStage IB grade 2Uterine segment involvementLymph node dissectionRecurrence-free survivalEndometrial cancerRisk factorsVaginal brachytherapyOverall survivalGrade 2Endometrioid histologyNode dissectionPelvic recurrenceSegment involvementLymph nodesMyometrial invasionMultivariable Cox proportional hazards regressionEarly-stage endometrial cancerUnderwent lymph node dissectionCox proportional hazards regressionReduced disease-free survivalAdjuvant vaginal brachytherapySole adjuvant therapyRefining the role of adjuvant chemotherapy in stage IB and IIA NSCLC.
Pathak R, Hoag J, Goldberg S, Monsalve A, Resio B, Boffa D. Refining the role of adjuvant chemotherapy in stage IB and IIA NSCLC. Journal Of Clinical Oncology 2019, 37: 8519-8519. DOI: 10.1200/jco.2019.37.15_suppl.8519.Peer-Reviewed Original ResearchNon-small cell lung cancerNational Cancer Data BaseHigh-risk featuresIIA non-small cell lung cancerAdjuvant chemotherapyStage IBGuideline recommendationsMultivariable Cox proportional hazards regressionBenefit of ACTMulti-agent adjuvant chemotherapyRole of ACSingle-agent adjuvant chemotherapyUse of ACCox proportional hazards regressionStage IB patientsCell lung cancerProportional hazards regressionImmortal time biasNon-academic centersPT2N0 patientsT2a patientsT2b patientsNSCLC patientsSurvival benefitAC patients
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