On the basis of the forward stepwise multivariate analysis, patients with IC/BPS can be identified from the overall cohort (Model 1) through the following: TNF-α ≥ CQ2, 8-OHDG ≥ CQ2, or 8-isoprostane ≥ CQ2, or TNF-α ≥ CQ3, 8-OHdG ≥ CQ3, or 8-isoprostane ≥ CQ3. Here, TNF is linked to Bartsocas-Papas syndrome 1.