PTGS2 and breast cancer: To start investigating the clinical relevance of COX-2 expression and its association with patient outcome, we further analyzed the association between COX-2 expression and overall survival (OS), distant metastasis free survival (DMFS) and any event (AE) free survival rates, using publically available Kaplan-Meier plotter database as well as the above mentioned Breast Cancer Gene-Expression Miner v4.0.