Abstract
BACKGROUND: Increasing prevalence of obesity has shown an associated increase in gastroesophageal reflux disease (GERD)-related diseases. Proton pump inhibitor (PPI) therapy has been demonstrated to reduce the incidence of such diseases. The study's aim was to analyze the Clinical Practice Research Datalink (CPRD) to determine factors that increase the propensity of obese patients on PPIs to develop Barrett's esophagus (BE) and esophageal carcinoma. METHOD: A case-control population study was carried out, including patients from the CPRD. Clinicopathological factors were extracted for each patient alongside clinical endpoints of GERD, BE, and esophageal carcinoma. Multivariate analysis was utilized to identify factors that increase the propensity to develop BE and esophageal carcinoma. Statistical significance was p < 0.050. RESULTS: One hundred sixty five thousand nine hundred twenty nine obese patients on PPI treatment were identified up until July 2017. Median follow-up time was 119.0 months (range 11.3-1397.9 months). In patients with GERD, the following were associated with increased BE risk: age ≥ 60 years (OR = 1.197; p = 0.039), male (OR = 2.209; p < 0.001), H2 antagonists (OR = 1.377; p < 0.001), D2 antagonists (OR = 1.241; p = 0.008), and hiatus hernias (OR = 6.772; p = 0.017). The following were associated with increased risk of esophageal carcinoma: age (OR = 2.831; p = 0.031), male sex (OR = 3.954; p = 0.003), and hiatus hernias (OR = 12.170; p < 0.001). Only D2 antagonists (OR = 2.588; p = 0.002) were associated with increased risk of developing esophageal carcinoma in BE patients. CONCLUSIONS: In obese patients on PPI therapy for reflux, higher BMIs were not associated with increased risk of BE or esophageal carcinoma. Males, older patients, and those with hiatus hernias are at increased risk of developing BE and carcinoma. Failure of PPI monotherapy is predictive of future metaplasia and dysplasia.