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ID 34963
file
creator
Dokhi, Mohammad
subject
Neuroblastoma
Weibull-distribution
Gamma-distribution
Maximum-likelihood
Information-matrix
NDC
Medical sciences
abstract
The log rank test and the Cox regression, or modifications thereof, emphasize the effect of covariates on survival rate parameter. In some cases, cured individuals, i.e., individuals who may not experience the event of interest may exist in the population of interest. In this situation, we may wish to examine the effect of covariates on both survival rate and cured fraction parameters. Motivated by the Japanese neuroblastoma dataset, we consider a cure model that accounted for the effect of covariates on both of the abovementioned parameters. To deal with heterogeneity that is not explained by covariates, as well as individual random heterogeneity, we perform a frailty variable. Moreover, some nested models are fitted to deal with the principle of parsimony. The effect of covariates was then evaluated by the best nested model. From a statistical point of view, we found that the model of analysis is flexible and adequate to describe the abovementioned dataset. From a medical point of view, we confirmed AGE and STAGE to be the most dominant prognosis factor of neuroblastoma. We also conclude that NMYC and FERRITIN are the other most important prognosis factors. The analysis designated that some of the prognosis factors of neuroblastoma probably just affected the median life of patients and some others are the fatal prognosis factor indicated by their effect which significance on both of survival rate and cured fraction parameters. The present model of analysis is also potentially extendable to facilitate other aspects of inferences.
journal title
Hiroshima Journal of Medical Sciences
volume
Volume 58
issue
Issue 1
start page
25
end page
35
date of issued
2009-03
publisher
Hiroshima University Medical Press
issn
0018-2052
ncid
language
eng
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
rights
(c) Hiroshima University Medical Press.
department
Graduate School of Biomedical Science
Research Institute for Radiation Biology and Medicine
Natural Science Center for Basic Research and Development
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