In addition, we could not find evidence to support heterogeneity in the association between the HER2 Ile655Val polymorphism and breast cancer risk according to recent physical activity (P = 0.45), cigarette smoking status (P = 0.66), adult height (P = 0.78), recent alcohol intake (P = 0.83), parity (P = 0.81), or age at menopause (P = 0.41) (data not shown). Here, ERBB2 is linked to breast cancer.