... currently unknown. The cell that gives rise to Barrett metaplasia is notknown. Recently, it has been hypothesized that intestinalmetaplasia may arise from a change in the differentia-tion pattern ... carcinogenesis of Barrett’s esophagus. However, todate there are no experimental data that support thishypothesis [11].Additionally, the findings of elevated gene and proteinexpression of MMP-1 by BE and ... accord-ing t o clinical visits of the patients (after 6 months, 12months, 18 months, and thereafter one clinical visit peryear). Information about patients who did not partici-pate in follow-up...