Ondrej Blaha, PhD
Associate Research Scientist in BiostatisticsCards
About
Research
Publications
2024
Global Disparities in the Characteristics and Outcomes of Leukemia Clinical Trials: A Cross-Sectional Study of the ClinicalTrials.gov Database.
Alhajahjeh A, Rotter L, Stempel J, Grimshaw A, Bewersdorf J, Blaha O, Kewan T, Podoltsev N, Shallis R, Mendez L, Stahl M, Zeidan A. Global Disparities in the Characteristics and Outcomes of Leukemia Clinical Trials: A Cross-Sectional Study of the ClinicalTrials.gov Database. JCO Global Oncology 2024, 10: e2400316. PMID: 39621951, DOI: 10.1200/go-24-00316.Peer-Reviewed Original ResearchAnalyzing determinants of premature trial discontinuation in leukemia clinical trials
Rotter L, Alhajahjeh A, Stempel J, Grimshaw A, Bewersdorf J, Blaha O, Kewan T, Podoltsev N, Shallis R, Mendez L, Stahl M, Zeidan A. Analyzing determinants of premature trial discontinuation in leukemia clinical trials. Leukemia & Lymphoma 2024, ahead-of-print: 1-9. PMID: 39440622, DOI: 10.1080/10428194.2024.2416565.Peer-Reviewed Original ResearchClinical trialsSlow accrualLeukemia trialsEarly-phase trialsNon-randomized trialsAcademic-sponsored trialsImprove patient outcomesLeukemia clinical trialsSingle-centerTrial discontinuationSponsored trialsSmall trialsLeukemiaEarly terminationPatient outcomesLate-phaseIndependent reviewersTermination ratesComprehensive searchTrialsPerioperative Modified FOLFIRINOX for Resectable Pancreatic Cancer
Cecchini M, Salem R, Robert M, Czerniak S, Blaha O, Zelterman D, Rajaei M, Townsend J, Cai G, Chowdhury S, Yugawa D, Tseng R, Arbelaez C, Jiao J, Shroyer K, Thumar J, Kortmansky J, Zaheer W, Fischbach N, Persico J, Stein S, Khan S, Cha C, Billingsley K, Kunstman J, Johung K, Wiess C, Muzumdar M, Spickard E, Aushev V, Laliotis G, Jurdi A, Liu M, Escobar-Hoyos L, Lacy J. Perioperative Modified FOLFIRINOX for Resectable Pancreatic Cancer. JAMA Oncology 2024, 10: 1027-1035. PMID: 38900452, PMCID: PMC11190830, DOI: 10.1001/jamaoncol.2024.1575.Peer-Reviewed Original ResearchProgression-free survivalPancreatic ductal adenocarcinomaOverall survivalCtDNA levelsPhase 2 nonrandomized controlled trialAnalysis of circulating tumor DNAMedian progression-free survivalResectable pancreatic ductal adenocarcinomaControlled trialsAssess surgical candidacyBaseline ctDNA levelModified 5-fluorouracilResectable pancreatic cancerPancreatic protocol computed tomographyAssociated with recurrenceTumor molecular featuresAggressive malignant tumorKaplan-Meier estimatesRandomized clinical trialsStandard of careCtDNA-positivePreoperative cyclesNonrandomized controlled trialsUnresectable diseaseModified FOLFIRINOXA Bayesian platform trial design with hybrid control based on multisource exchangeability modelling
Wei W, Blaha O, Esserman D, Zelterman D, Kane M, Liu R, Lin J. A Bayesian platform trial design with hybrid control based on multisource exchangeability modelling. Statistics In Medicine 2024, 43: 2439-2451. PMID: 38594809, PMCID: PMC11325877, DOI: 10.1002/sim.10077.Peer-Reviewed Original Research
2023
Validation of the Molecular International Prognostic Scoring System (IPSS-M) in Patients (Pts) with Myelodysplastic Syndromes/Neoplasms (MDS) Who Were Treated with Hypomethylating Agents (HMA)
Kewan T, Bewersdorf J, Blaha O, Stahl M, Al Ali N, DeZern A, Sekeres M, Carraway H, Desai P, Griffiths E, Stein E, Brunner A, Amaya M, Zeidner J, Savona M, Stempel J, Chandhok N, Logothetis C, Ramaswamy R, Rose A, Roboz G, Rolles B, Wang E, Harris A, Shallis R, Xie Z, Padron E, Maciejewski J, Sallman D, Della Porta M, Komrokji R, Zeidan A. Validation of the Molecular International Prognostic Scoring System (IPSS-M) in Patients (Pts) with Myelodysplastic Syndromes/Neoplasms (MDS) Who Were Treated with Hypomethylating Agents (HMA). Blood 2023, 142: 3240. DOI: 10.1182/blood-2023-186340.Peer-Reviewed Original ResearchComplete remission rateOverall response rateOutcome of ptsMedian overall survivalOverall survivalHypomethylating agentHMA initiationHR-MDSC-indexRisk groupsScoring systemInternational Prognostic Scoring SystemResponse criteriaPrognostic scoring systemHigh-risk diseaseLarge multicenter cohortHigh-risk groupHarrell's C-indexLog-rank testPrediction of outcomeDifferent scoring systemsSubsequent validation studiesHMA cyclesMedian followAllogeneic HSCTValidation of the Molecular International Prognostic Scoring System (IPSS-M) in Patients (Pts) with Myelodysplastic Syndromes/Neoplasms (MDS) Who Underwent Allogenic Stem Cell Transplantation (HSCT)
Kewan T, Bewersdorf J, Blaha O, Stahl M, Al Ali N, DeZern A, Sekeres M, Uy G, Carraway H, Desai P, Griffiths E, Stein E, Brunner A, Amaya M, Zeidner J, Savona M, Stempel J, Chandhok N, Logothetis C, Cochran H, Rose A, Roboz G, Wang E, Rolles B, Harris A, Shallis R, Xie Z, Padron E, Maciejewski J, Sallman D, Della Porta M, Komrokji R, Zeidan A. Validation of the Molecular International Prognostic Scoring System (IPSS-M) in Patients (Pts) with Myelodysplastic Syndromes/Neoplasms (MDS) Who Underwent Allogenic Stem Cell Transplantation (HSCT). Blood 2023, 142: 4980. DOI: 10.1182/blood-2023-186578.Peer-Reviewed Original ResearchOverall survivalHigh-risk groupUnderwent HSCTC-indexRisk groupsHigh riskDonor typeInternational Prognostic Scoring SystemAllogenic stem cell transplantationTime of HSCTMedian overall survivalReduced-intensity conditioningSignificant OS differencePrognostic scoring systemRisk stratification toolTime of diagnosisStem cell transplantationSingle-institution analysisLog-rank testHarrell's C-indexDifferent overall survivalCox proportional hazardsHMA cyclesHaploidentical donorsMaintenance therapyEvaluation of the Molecular International Prognostic Scoring System (IPSS-M) in Patients (Pts) with Myelodysplastic Syndromes/Neoplasms (MDS) with Missing Molecular Data
Kewan T, Bewersdorf J, Blaha O, Stahl M, Al Ali N, DeZern A, Sekeres M, Carraway H, Desai P, Griffiths E, Stein E, Brunner A, Amaya M, Zeidner J, Savona M, Stempel J, Chandhok N, Logothetis C, Cochran H, Singh A, Roboz G, Rolles B, Wang E, Harris A, Shallis R, Xie Z, Padron E, Sallman D, Maciejewski J, Della Porta M, Komrokji R, Zeidan A. Evaluation of the Molecular International Prognostic Scoring System (IPSS-M) in Patients (Pts) with Myelodysplastic Syndromes/Neoplasms (MDS) with Missing Molecular Data. Blood 2023, 142: 4607. DOI: 10.1182/blood-2023-187053.Peer-Reviewed Original ResearchValidation of the Composite Complete Response (cCR) Definitions in the International Working Group (IWG) 2023 Criteria in Patients (Pts) with Higher-Risk Myelodysplastic Syndromes/Neoplasms (HR-MDS) Treated with Hypomethylating Agents (HMA) - a Large, Multicenter, Retrospective Analysis from the Validate Database
Bewersdorf J, Kewan T, Blaha O, Stahl M, Al Ali N, DeZern A, Sekeres M, Uy G, Carraway H, Desai P, Griffiths E, Stein E, Brunner A, McMahon C, Zeidner J, Savona M, Stempel J, Chandhok N, Logothetis C, Roboz G, Rolles B, Wang E, Harris A, Amaya M, Hawkins H, Grenet J, Shallis R, Xie Z, Maciejewski J, Sallman D, Della Porta M, Komrokji R, Zeidan A. Validation of the Composite Complete Response (cCR) Definitions in the International Working Group (IWG) 2023 Criteria in Patients (Pts) with Higher-Risk Myelodysplastic Syndromes/Neoplasms (HR-MDS) Treated with Hypomethylating Agents (HMA) - a Large, Multicenter, Retrospective Analysis from the Validate Database. Blood 2023, 142: 324. DOI: 10.1182/blood-2023-180299.Peer-Reviewed Original ResearchImproved OSHypomethylating agentHMA initiationMedian OSResponse assessmentTP53 mutationsResponse definitionsPartial hematologic recoveryPredictors of OSMultivariable Cox modelBone marrow blastsKaplan-Meier analysisLog-rank testOverall response rateEfficacy of therapyMultivariable regression modelsReal-world analysisAllo-HCTBM assessmentBM evaluationHemoglobin thresholdHematologic recoveryMarrow blastsMedian durationMedian ageClinical Implications of TP53 Mutations/Allelic State in Patients (Pts) with Myelodysplastic Syndromes/Neoplasms (MDS) Treated with Hypomethylating Agents (HMA)- a Multicenter, Retrospective Analysis from the Validate Database
Kewan T, Bewersdorf J, Blaha O, Stahl M, Al Ali N, DeZern A, Sekeres M, Carraway H, Desai P, Griffiths E, Stein E, Brunner A, Amaya M, Zeidner J, Savona M, Stempel J, Chandhok N, Cochran H, Ramaswamy R, Singh A, Roboz G, Rolles B, Wang E, Harris A, Shallis R, Xie Z, Padron E, Maciejewski J, Della Porta M, Komrokji R, Sallman D, Zeidan A. Clinical Implications of TP53 Mutations/Allelic State in Patients (Pts) with Myelodysplastic Syndromes/Neoplasms (MDS) Treated with Hypomethylating Agents (HMA)- a Multicenter, Retrospective Analysis from the Validate Database. Blood 2023, 142: 1002. DOI: 10.1182/blood-2023-186875.Peer-Reviewed Original ResearchOverall response rateMedian overall survivalOverall survivalComplete responseHMA initiationHMA therapyMultivariable Cox proportional hazards regression modelsCox proportional hazards regression modelHigh-risk disease featuresComplex karyotypeProportional hazards regression modelsWorse overall survivalLog-rank testHazards regression modelsSignificant differencesLogistic regression modelsAllogenic HSCTBM biopsyHMA cyclesMDS-EBTherapy initiationMedian ageRegression modelsCR ratePoor outcomeImpact of Type of Hypomethylating Agent (HMA) Used on Outcomes of Patients (Pts) with Higher-Risk Myelodysplastic Syndromes/Neoplasms (HR-MDS) - a Large, Multicenter, Retrospective Analysis
Bewersdorf J, Kewan T, Blaha O, Stahl M, Al Ali N, DeZern A, Sekeres M, Uy G, Carraway H, Desai P, Griffiths E, Stein E, Brunner A, McMahon C, Zeidner J, Savona M, Stempel J, Chandhok N, Ramaswamy R, Roboz G, Rolles B, Wang E, Harris A, Amaya M, Hawkins H, Grenet J, Gurnari C, Shallis R, Xie Z, Maciejewski J, Sallman D, Della Porta M, Komrokji R, Zeidan A. Impact of Type of Hypomethylating Agent (HMA) Used on Outcomes of Patients (Pts) with Higher-Risk Myelodysplastic Syndromes/Neoplasms (HR-MDS) - a Large, Multicenter, Retrospective Analysis. Blood 2023, 142: 4613. DOI: 10.1182/blood-2023-178728.Peer-Reviewed Original ResearchCox multivariable regression modelOverall survivalHMA initiationHypomethylating agentMultivariable regression modelsTP53 mutationsAllo-HCTComplete remissionComplex karyotypePartner drugsBone marrowSurvival analysisAllogeneic hematopoietic cell transplantMultivariable Cox regression modelsTreatment typeOverall responseAdverse genetic featuresMedian overall survivalOutcomes of patientsHematopoietic cell transplantAdverse overall survivalKaplan-Meier methodCox regression modelLog-rank testPredictors of response