MKI67 and breast cancer: At univariate logistic regression, age of breast cancer diagnosis and menopause age were found to be predictive factors for Ki67 < 20%, p = 0.005 (OR = 0.917; 95%CI: 0.862–0.974) and p = 0.028 (OR = 0.926; 95%CI: 0.865–0.992), respectively.