CDH5 and breast cancer: The CDH5:HPA ratio data showed significant positive skew, and thus was considered as a categorical variable (according to tertiles: low=0.007–0.062 ng AU−1 (n=36), mid=0.062–0.117 ng AU−1 (n=37), high=0.117–0.586 ng AU−1 (n=37)) in the logistic regression model which predicted breast cancer metastasis in a statistically significant manner (P=0.036).