Diabetes, Vol 31, Issue 12 1051-1055, Copyright © 1982 by American Diabetes Association

ARTICLES

Predictive value of gastric parietal cell autoantibodies as a marker for gastric and hematologic abnormalities associated with insulin-dependent diabetes

WJ Riley, PP Toskes, NK Maclaren and JH Silverstein

The frequency and significance of gastric parietal cell autoimmunity was assessed in 771 patients with insulin-dependent diabetes (IDD) of onset before 30 yr of age. Gastric parietal autoantibodies (PCA) were found 4 times more frequently in the patients with IDD (9%) than among 600 matched nondiabetic controls (2%). Caucasian female patients with IDD had PCA twice as frequently as male patients. Thyroid microsomal autoantibodies were more frequent in patients with IDD and PCA, than in those with IDD alone (Caucasian 46% versus 18%, black 25% versus 2.5%). A history of pernicious anemia and/or PCA was found in 25 or 40 families of IDD probands with PCA. Achlorhydria was demonstrated in 6 of 11 patients (54%) with PCA but in none of seven IDD patients without PCA. The six patients with achlorhydria had significantly lower uptakes of oral radiolabeled cobalamin, lower serum cobalamin levels, lower intrinsic factor-R protein ratios in their gastric aspirates, and lower plasma ferritin levels than patients with IDD but without PCA. None of the study group had IF antibodies in their serum or gastric juice. Overt pernicious anemia and neuropathy were found in one patient with PCA. Young patients with IDD at risk for atrophic gastritis and cobalamin deficiency can initially be identified by screening for PCA. Many of these young patients with PCA already have achlorhydria and evidence of decreased absorption of cobalamin. These patients can then be followed with cobalamin levels and/or with complete blood counts to identify those requiring therapy.
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