a, ROC curve analysis shows LOX expression may be indicative of metastatic dissemination of ER-negative breast cancer (AUC 0.77, P<0.0001) but not ER-positive patients (AUC 0.55, P<0.1504). b, In an alternative second patient dataset (Van de Vijver et al. [pubmed ID: 12490681]) reporting data on 295 lymph node negative (LNN) patients who did not receive adjuvant therapy, with available site of relapse, LOX is significantly higher expressed in bone relapse ER-negative patients, compared to other groups confirming data from the original dataset.