Data showed GG genotype at CCND1 A870G less prevalent in breast cancer patients younger than 55 years (OR=0.62, 95%CI=0.43–0.89, P=0.0362), with first menarche earlier than 12.2 years (OR=0.61, 95% CI=0.42–0.87, P=0.0241), with menopause earlier than 49.0 years (OR=0.57, 95%CI=0.39–0.82, P=0.0093), or with triple-negative breast cancer (OR=0.28, 95%CI=0.13–0.62, P=0.0006) (Tables 3-4). The gene discussed is CCND1; the disease is breast cancer.