FABP1 and autoimmune pancreatitis: The kidney damage marker FABP-1 in plasma was higher in the group of AIP cases with high urine PBG (n = 30, median 49 pg/mL, IQR = 28–103) compared with the group of AIP cases with low urine PBG (n = 20, median 23 pg/mL, IQR 12–58, p = 0.02, Figure 4).