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HERO ID
1597269
Reference Type
Journal Article
Title
Applications of the Poly-K Statistical Test to Life-Time Cancer Bioassay Studies
Author(s)
Gebregziabher, M; Hoel, D
Year
2009
Is Peer Reviewed?
Yes
Journal
Human and Ecological Risk Assessment
ISSN:
1080-7039
EISSN:
1549-7860
Volume
15
Issue
5
Page Numbers
858-875
Language
English
PMID
20508734
DOI
10.1080/10807030903153360
Web of Science Id
WOS:000271231700002
Abstract
The statistical analysis of cancer bioassay data has historically depended on the pathological determination of the experimental animal's cause of death. The poly-k statistical test has provided a method of statistical analysis of animal bioassay data without the need for cause of death information. The test has been shown to have good statistical properties in the typical 2-year cancer bioassay. However, while the poly-k test has been applied to chronic lifetime animal studies, it has not been formally evaluated with respect to the operating characteristics of this statistical test when applied to such studies. Thus, our objective is to assess the performance of the poly-k test for lifetime studies and to make comparisons with other tests. We observed in one recent lifetime study of the gasoline additive MTBE that the application of the poly-k test was not statistically robust. Simulation studies were subsequently conducted for a limited number of scenarios of lifetime cancer bioassays. These simulations showed that the poly-k test is not statistically robust for testing effect of increasing dose in some lifetime cancer studies.
Keywords
logistic regression score test; logrank test; survival adjusted trend tests; type-I error; re-weighted poly-k test; power
Tags
IRIS
•
Methanol (Non-Cancer)
Ramazzini
•
Ramazzini Institute
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