Missense single-nucleotide polymorphism in the SIAE gene has also been associated with the anti-PIT-1 antibody syndrome, a novel clinical entity related to autoimmune polyglandular syndrome ( APS ).
2.
:A quick check of PubMed turned up which says that cholecystokinin autoantibodies can be a result of autoimmune polyglandular syndrome type I . But the fault seems to be more at the autoimmunity level, with multiple hormones becoming neutralized.