PERM1 and autoimmune pancreatitis: Similar to the results of the mtDNA copy number, the AIP cohort exhibited significantly lower levels of PERM1 (t = 3.279, p < 0.01) than healthy individuals, with median values (and interquartile range) of 1.932 ng/mL (1.470–3.260) and 1.273 ng/mL (1.085–1.851), respectively.