Abstract
The natural history of patients with potential autoimmune gastritis (AIG), defined by the presence of serum anti-parietal cell antibody (PCA) positivity and no gastric histopathological alterations, is unknown. We therefore aimed to assess the natural history and clinical correlates of potential autoimmune gastritis (AIG). In 2000-2019, we enrolled potential AIG patients by monitoring once a year (±6 months) histopathological evolution into overt AIG, defined as the occurrence of atrophy in the oxyntic mucosa. Factors affecting disease progression were assessed. Fifty-one potential AIG patients (median age 57 years, IQR 43-73, F:M ratio 1.7:1) were monitored for up to 15 years (median 6 years, IQR 3-8). Of them, 24 (47.1%) evolved into overt AIG in a median time of 2 years (IQR 2-4.5). Having a concomitant autoimmune disorder (HR 4.09, 95% CI 1.52-11.00; p=0.005), but not older age (HR 1.00, 95% CI 0.45-2.22; p=0.992) and female sex (HR 1.19, 95% CI 0.51-2.78; p=0.395), was associated with evolution into overt AIG. Roughly one in two potential AIG patients will evolve into overt AIG over a median time of two years, especially those with a concurrent autoimmune disorder.
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