This is a multi-center prospective, randomized controlled trial conducted at 4 centers. The patients with high grade dysplasia(HGD) and/or esophageal cancer(EC) who meet the study criteria will be enrolled, undergo a baseline diagnostic EMR and then be randomized in a 1:1 ratio to undergo treatment by either S-EMR or radiofrequency ablation(RFA). The initial staging EMR will not extend more than 50% of the esophageal circumference or more than 2 cm in longitudinal extent. Patients in the S-EMR group will undergo step-wise eradication of the BE segment using the Duette multi-band mucosectomy kit (Cook Medical, FDA approved) whereas those in the RFA group will undergo BE ablation using the endoscopically-guided HALO radiofrequency ablation system (Barrx Medical, FDA approved).