included 336 matched case–control pairs and found a borderline significant positive association between 8-oxodG and risk of all breast cancer (IRR: 1.08; 95% CI 1.00–1.17 per unit increase in nmol/mmol creatinine), which was significant with respect to the risk of oestrogen receptor-positive cancers (IRR: 1.11; 95% CI 1.01–1.23) and among women with low dietary iron intake (IRR: 1.10; 95% CI 1.06–1.37) [20] .
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