PTGER4 and neoplasm: It was found that only for breast or ovarian tumors, ROC curves for (PTGIS, PTGES, and PTGER4) or (TBXAS1, PTGES, TBXA2R, and PTGDR2), respectively, had Area Under Curve (AUC) values > 0.75 at the tumor/normal fold changes ≥ 2 (Figure S2A,B).