RESPONSE: Re: Population-Based, Case-Control Study of HER2 Genetic Polymorphism and Breast Cancer Risk

Abstract
We read with interest the letter by Drs. Baxter and Campbell regarding the association between HER2 genetic polymorphism and breast cancer risk. Drs. Baxter and Campbell found in a hospital-based, case–control study conducted among British women that genotype frequencies of the HER2 gene at codon 655 (Ile to Val) were similar between case patients with breast or ovarian cancer and control subjects. This finding was inconsistent with our finding in a population-based, case–control study conducted among Chinese women (1). In that study, we found that the Val/Val genotype was associated with an elevated risk of breast cancer, particularly among younger women (1).

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