PHB1 and autoimmune pancreatitis: Anti-PHB antibodies were present in the sera of patients with a different subtype of IgG4-RD (Fig 4B) including definite AIP (25/34; 73.5%), MD (8/15; 53.3%), RPF (6/11; 54.5%), and other probable IgG4-RD (26/29; 89.7%).