In BP patients with mucosal involvement at baseline, anti-BP180 ELISA values were only correlated with the erythema/urticaria BPDAI score (P = 0.03). Within this subgroup of BP patients, only a correlation tendency was observed with the total BPDAI score (P = 0.09) and the skin BPDAI score (P = 0.06), whereas no correlation could be drawn with the blister/erosion BPDAI score (P = 0.30) (Figures 3E–H, Table 4A). Finally, no correlation was found between the mucous membrane part of BPDAI score and the anti-BP180-NC16A ELISA values.