BACKGROUND: The free radical/oxidative stress theory of ageing has received considerable attention, but the evidence on the association of oxidative stress markers with mortality is sparse. METHODS: We measured derivatives of reactive oxygen metabolite (D-ROM) levels as a proxy for the reactive oxygen species concentration and total thiol levels (TTL) as a proxy for the redox control status in 10,622 men and women (age range, 45-85 years), from population-based cohorts from Germany, Poland, Czech Republic, and Lithuania, of whom 1,702 died during follow-up. RESULTS: Both oxidative stress markers were significantly associated with all-cause mortality independently from established risk factors (including inflammation) and from each other in all cohorts. Regarding cause-specific mortality, compared to low D-ROM levels (≤ 340 Carr U), very high D-ROM levels (>500 Carr U) were strongly associated with both cardiovascular (relative risk (RR), 5.09; 95 % CI, 2.67-9.69) and cancer mortality (RR, 4.34; 95 % CI, 2.31-8.16). TTL was only associated with CVD mortality (RR, 1.30; 95 % CI, 1.15-1.48, for one-standard-deviation-decrease). The strength of the association of TTL with CVD mortality increased with age of the participants (RR for one-standard-deviation-decrease in those aged 70-85 years was 1.65; 95 % CI, 1.22-2.24). CONCLUSIONS: In these four population-based cohort studies from Central and Eastern Europe, the oxidative stress serum markers D-ROM and TTL were independently and strongly associated with all-cause and CVD mortality. In addition, D-ROM levels were also strongly associated with cancer mortality. This study provides epidemiological evidence supporting the free radical/oxidative stress theory of ageing and suggests that d-ROMs and TTL are useful oxidative stress markers associated with premature mortality.

Department Epidemiology and Public Health University College London 1 19 Torrington Place London WC1E 6BT Great Britain

Division of Clinical Epidemiology and Ageing Research German Cancer Research Center Im Neuenheimer Feld 581 69120 Heidelberg Germany

Institute of Cardiology of Lithuanian University of Health Sciences Kaunas Lithuania

Jagiellonian University Medical College Faculty of Health Sciences Krakow Poland

Laboratory for Health Protection Research National Institute for Public Health and the Environment PO Box 1 3720 BA Bilthoven The Netherlands

National Institute of Public Health Prague Czech Republic

Network Aging Research University of Heidelberg Bergheimer Strasse 20 69120 Heidelberg Germany

Saarland Cancer Registry Präsident Baltz Strasse 5 66119 Saarbrücken Germany

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