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RESEARCH PRODUCT
The clinical use of statistical permutation test methodology: a tool for identifying predictive variables of outcome.
Maurizio BrausiR. TenagliaVincenzo SerrettaRenzo ColomboPaolo GonteroRosa ArborettiSalvatore SiracusanoGiovanni CasettaMarco RacioppiChiara BrombinVincenzo AltieriGiuseppe MorgiaMassimo MaffezziniLuigi SalmasoPierfrancesco BassiRodolfo HurleRiccardo BartolettiDaniele D'agostinosubject
AdultMalemedicine.medical_specialtyUrologyStatistics as TopicHydronephrosisnonparametric combinationCystectomyOutcome (game theory)Statistics NonparametricBladder cancer; Permutation test; PrognosisSettore MED/24 - UrologiaBladder cancer Prognosis Permutation testPredictive Value of TestsResamplingMedicineHumansPermutation testRadical surgeryIntensive care medicineAgedNeoplasm StagingRetrospective StudiesAged 80 and overCarcinoma Transitional CellBladder cancerbusiness.industryBladder cancerProstatePermutation testsMiddle Agedmedicine.diseasePrognosisradical surgery for bladder; nonparametric combinationradical surgery for bladderSurgeryPatient Outcome Assessmentbladder cancer; Prognosis; Permutation testsItalyUrinary Bladder NeoplasmsBladdder Cancer Cystectomy outcome statistical methodologyData Interpretation StatisticalLymphatic MetastasisMultivariate AnalysisFemalePredictive variablesradical surgery for bladder nonparametric combinationbusinessdescription
<b><i>Objectives:</i></b> To identify the predictive variables affecting the outcome after radical surgery for bladder cancer by a newer statistical methodology, i.e. nonparametric combination (NPC). <b><i>Methods:</i></b> A multicenter study enrolled 1,312 patients who had undergone radical cystectomy for bladder cancer in 11 Italian oncological centers from January 1982 to December 2002. A statistical analysis<b> </b>of their medical history and diagnostic, pathological and postoperative variables was performed using a NPC test. The<b> </b>patients were included in a comprehensive database with medical history and clinical and pathological data. Five-year survival was used as the dependent variable, and p values were corrected for multiplicity using a closed testing procedure. The newer nonparametric approach was used to evaluate the prognostic importance of the variables. All of the analyses were performed using routines developed in MATLAB© and the significance level was set at α = 0.05. <b><i>Results:</i></b> A significant prognostic predictive value (p < 0.01) for tumor clinical staging, hydronephrosis, tumor pathological staging, grading, presence of concomitant carcinoma in situ, regional lymph node involvement, corpora cavernosa invasion, microvascular invasion, lymphatic invasion and prostatic stroma involvement was found. <b><i>Conclusions:</i></b> The NPC test could handle any type of variable (categorical and quantitative) and take into account the multivariate relation among variables. This newer methodology offers a significant contribution in biomedical studies with several endpoints and is recommended in presence of non-normal data and missing values, as well as solving high-dimensional data and problems relating to small sample sizes.
year | journal | country | edition | language |
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2015-01-01 |