Liver enzymes and risk of all-cause mortality in general populations: a systematic review and meta-analysis
- PMID: 24585856
- DOI: 10.1093/ije/dyt192
Liver enzymes and risk of all-cause mortality in general populations: a systematic review and meta-analysis
Abstract
Background: Gamma glutamyltransferase (GGT), alanine aminotransferase (ALT), aspartate aminotransferase (AST) and alkaline phosphatase (ALP), commonly used as markers of liver dysfunction, have been implicated with risk of all-cause mortality. The prospective evidence on the associations in general populations has not been reliably quantified.
Methods: We conducted a systematic review and meta-analysis of published prospective cohort studies evaluating the associations of baseline levels of these enzymes with all-cause mortality in general populations. Relevant studies were identified in a literature search of MEDLINE, EMBASE and Web of Science up to March 2013. Authors of unpublished studies provided data on request.
Results: Nineteen unique cohort studies with aggregate data on over 9.24 million participants and 242 953 all-cause mortality outcomes were included. In a comparison of extreme thirds of baseline GGT and ALP levels, relative risks (RRs) (95% confidence intervals) for all-cause mortality were 1.60 (1.42-1.80) and 1.38 (1.17-1.63), respectively. The corresponding RRs for ALT were 0.82 (0.78-0.86) and 1.43 (1.08-1.90) in North American and Asian populations, respectively. There was no strong evidence of an association of AST with all-cause mortality: RR 1.23 (0.80-1.88). The pooled RRs per 5 U/l increment in GGT and ALP levels were 1.07 (1.04-1.10) and 1.03 (1.01-1.06), respectively.
Conclusions: Available data indicate positive independent associations of baseline levels of GGT and ALP with all-cause mortality, consistent with linear dose-response relationships. There were geographical variations in the association of ALT with all-cause mortality which require further investigation. The potential incremental prognostic values of GGT and ALP in mortality risk assessment need evaluation.
Keywords: Gamma glutamyltransferase; alkaline phosphatase; aminotransferases; meta-analysis; mortality.
Comment in
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Commentary: liver enzymes and all-cause mortality.Int J Epidemiol. 2014 Feb;43(1):202-3. doi: 10.1093/ije/dyt253. Epub 2013 Dec 27. Int J Epidemiol. 2014. PMID: 24374828 No abstract available.
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