2014
Prophylactic Cranial Irradiation for Patients With Locally Advanced Non–Small-Cell Lung Cancer at High Risk for Brain Metastases
Park HS, Decker RH, Wilson LD, Yu JB. Prophylactic Cranial Irradiation for Patients With Locally Advanced Non–Small-Cell Lung Cancer at High Risk for Brain Metastases. Clinical Lung Cancer 2014, 16: 292-297. PMID: 25499149, DOI: 10.1016/j.cllc.2014.11.005.Peer-Reviewed Original ResearchConceptsProphylactic cranial irradiationLA-NSCLC patientsSequential landmark analysesCell lung cancerBrain metastasesHigh riskCranial irradiationSurvival benefitLung cancerLandmark analysisEffect of PCICox proportional hazards regressionNon-PCI patientsOverall survival benefitEnd Results (SEER) databaseHigh-risk patientsStage III NSCLCGroup of patientsProportional hazards regressionLog-rank testSignificant survival differenceImmortal time biasPopulation-based analysisAdult patientsOnly patients
2012
Immortal Time Bias: A Frequently Unrecognized Threat to Validity in the Evaluation of Postoperative Radiotherapy
Park HS, Gross CP, Makarov DV, Yu JB. Immortal Time Bias: A Frequently Unrecognized Threat to Validity in the Evaluation of Postoperative Radiotherapy. International Journal Of Radiation Oncology • Biology • Physics 2012, 83: 1365-1373. PMID: 22342097, DOI: 10.1016/j.ijrobp.2011.10.025.Peer-Reviewed Original ResearchConceptsSequential landmark analysesPostoperative radiotherapyImmortal time biasLandmark analysisTumor typesEnd Results (SEER) databaseObservational cohort studyTime biasObservation cohortCohort studyHazard ratioProspective trialImproved survivalResults databaseConditional survivalRoutine useSurvivalApparent benefitRadiotherapyCohort