FUT4 and Bartsocas-Papas syndrome 1: Significant positive correlations were found between the following cell markers in biopsies of IC/BPS patients with Hunner lesions: CD20 and CD3, CD20 and CD14, CD20 and CD138, CD3 and CD14, CD14 and CD15, and CD14 and CD138 (p < 0.05) (Additional file 1: Table S3).