A comparison of Cox and logistic regression for use in genome-wide association studies of cohort and case-cohort design.
- Authors
- Staley, James R; Jones, Edmund; Kaptoge, Stephen; Butterworth, Adam S; Sweeting, Michael J; Wood, Angela M; Howson, Joanna M M
- Year
- 2017
- Journal
- European journal of human genetics : EJHG
- PMID
- 28594416
- DOI
- 10.1038/ejhg.2017.78
- PMCID
- PMC5520083
Logistic regression is often used instead of Cox regression to analyse genome-wide association studies (GWAS) of single-nucleotide polymorphisms (SNPs) and disease outcomes with cohort and case-cohort designs, as it is less computationally expensive. Although Cox and logistic regression models have been compared previously in cohort studies, this work does not completely cover the GWAS setting nor extend to the case-cohort study design. Here, we evaluated Cox and logistic regression applied to cohort and case-cohort genetic association studies using simulated data and genetic data from the EPIC-CVD study. In the cohort setting, there was a modest improvement in power to detect SNP-disease associations using Cox regression compared with logistic regression, which increased as the disease incidence increased. In contrast, logistic regression had more power than (Prentice weighted) Cox regression in the case-cohort setting. Logistic regression yielded inflated effect estimates (assuming the hazard ratio is the underlying measure of association) for both study designs, especially for SNPs with greater effect on disease. Given logistic regression is substantially more computationally efficient than Cox regression in both settings, we propose a two-step approach to GWAS in cohort and case-cohort studies. First to analyse all SNPs with logistic regression to identify associated variants below a pre-defined P-value threshold, and second to fit Cox regression (appropriately weighted in case-cohort studies) to those identified SNPs to ensure accurate estimation of association with disease.
Difference in power between the Cox and logistic regression models for an SNP with a risk allele frequency of 10% for the cohort study design. The red, blue and green lines represent the sample sizes 5000, 10 000 and 25 000, respectively. Complete (a), Survey (b) and Random (c) are the types of follow-up and 5, 10 and 15% are the cumulative disease incidences.
Difference in power between the Cox and logistic regression models for an SNP with a risk allele frequency of 10% for the case-cohort study design. The red, blue and green lines represent the sampling fractions of 5, 10 and 15%, respectively. Complete (a), Survey (b) and Random (c) are the types of follow-up and 5, 10 and 15% are the cumulative disease incidences.
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