BDNF and Bartsocas-Papas syndrome 1: When we divide IC/BPS patients into NHIC with MBC > 760 mL, NHIC with MBC ≤ 760 mL, and HIC subgroups, patients with HIC were found to have significantly higher urinary IL-8, CXCL10, BDNF, eotaxin, IL-6, MIP-1β, and RANTES levels than patients with NHIC.