Concurrent chemoradiotherapy is the standard of care for esophageal cancer based on the results of phase III randomised trials. The current standard radiation therapy dose has remained 50 Gy at -2 Gy/fraction for decades.However, locoregional control remain problematic, with 25% of patients having persistence and 20% relapse of locoregional disease following the combined modality approach. New regimen is urgently needed for improving localregional control and survival.Investigators hypothesize that hyperfractionated radiation dose escalation to residual tumor volumes after standard chemoradiotherapy as defined by positron emission tomography (PET) /computed tomography (CT) would improve local control and overall survival while reducing the acute and late normal tissue toxicity.