Cancer Epidemiol Biomarkers Prev. 1994 Mar;3(2):173-5.

Statistical analysis of molecular epidemiology studies employing case-series.

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Memorial Sloan-Kettering Cancer Center, Department of Epidemiology and Biostatistics, New York, New York 10021.

Abstract

The case-series design is being used increasingly to explore associations between environmental risk factors and genetic markers. It is demonstrated that the odds ratio derived from a case-series study is the ratio of the relative risk for developing marker-positive disease to the relative risk for developing marker-negative disease. This parameter is an empirical manifestation of etiological heterogeneity with respect to the risk factor under study, and it can be used to construct a statistical significance test. Presence of etiological heterogeneity, as reflected in departures of this parameter from unity, could be a result of either the presence of distinct causal mechanisms for the two categories of cases, or a different strength of effect via the same mechanism. The case-series approach represents an efficient and valid approach for evaluating gene-environment associations, especially in referral centers where it is difficult to identify a valid control group.

PMID:: 8049640; [PubMed - indexed for MEDLINE]

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