FOLR1 and neoplasm: The sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and area under the curve (AUC) were calculated for EpCAM, αvβ6 and FRα based on either “overexpression” or “no overexpression” to determine the potential of correctly identifying tumor-positive and tumor-negative lymph nodes in primary debulking samples (Table 2).