Past use of lower esophageal sphincter (LES)-relaxing drugs was positively associated with risk of esophageal adenocarcinoma. Among daily, long-term users (>5 years) of LES-relaxing drugs, the estimated incidence rate ratio was 3.8 (95% confidence interval [CI], 2.2-6.4) compared with persons who had never used these drugs. Gastric cardia adenocarcinoma and esophageal squamous cell carcinoma were not associated with use of LES-relaxing drugs.
There exists a strong relationship between body mass index (BMI) and esophageal adenocarcinoma. The adjusted odds ratio (OR) was 7.6 (95% CI, 3.8-15.2) among persons in the highest BMI quartile compared with persons in the lowest. Obese persons (those with BMI >30 kg/m2) had an OR of 16.2 (95% CI, 6.3-41.4) compared with the leanest persons (BMI <22 kg/m2). Esophageal squamous cell carcinoma was not associated with BMI.
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