The relationship between eosinophilic esophagitis and esophageal cancer.
Eosinophilic esophagitis (EoE) is a disorder characterized by long-term chronic eosinophilic inflammation, which may predispose patients for malignant transformation. To determine if EoE is associated with an increased risk for esophageal cancer (EC) over time. This was a cross-sectional population-based study using the Explorys Platform. Data were collected from January 1999 to December 2014 and the search terms 'Eosinophlic esophagitis', gastroesophageal reflux disease, and Barrett's esophagus were used. The latter two served as comparison groups. The term 'malignant tumor of esophagus' was searched in Explorys and was accepted only if it was established after the aforementioned diagnoses. Analysis was performed using social science statistical software. A total of 27,183,310 subjects were included in the study. Of those 5,370 (0.02%) had the diagnosis of EoE, 25,610 (0.09%) BE, and 2,606,640 (9.59%) gastroesophageal reflux (GERD). In general, diagnosis of EC was rare prior to age 40. Therefore, subsequent analysis was done on subjects between 40 to 79 years of age (N = 20,257,480). The prevalence of EC was 0.05% (N = 2420), in BE (N = 19,640) 2.65%, and in GERD (N = 1,696,230) 0.22%. No cases of EC were identified among those with EoE. We found no significant difference or increased risk in the rate of EC in the EoE group (P = 0.575) when compared to the control population. In this largest study, we found no association between esophageal cancer and EoE. Further long-term prospective studies are needed to better characterize the relationship between EoE and esophageal malignancy.