The Catechol-O-Methyltransferase Val158Met Polymorphism Contributes to the Risk of Breast Cancer in the Chinese Population: An Updated Meta-Analysis.

[ 21 ] reported a decreased risk of breast cancer among European populations in the recessive model, with borderline significance (OR, 0.96, 95% CI, 0.92-1.00; OR, 0.90, 95% CI, 0.90-1.00, respectively), but not in Asians.

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In the stratification analysis based on control source, we found a borderline significant increase in the risk of breast cancer among studies using population-based controls but not in those using hospital-based controls.

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