A 54-year-old man has had long-term GERD symptoms. He has been on proton pump inhibitors and has had fair control of his symptoms. Other past history is unremarkable. He is a non-smoker and drinks socially. Family history is significant for hypercholesterolemia in his father. Physical examination is unremarkable. An endoscopy a few years ago revealed Barrett's esophagus by biopsy of the esophageal mucosa. He was recommended to have follow-up endoscopy every 2-3 years with mucosal biopsy.What potential condition was the reason why this screening was recommended to him?

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