NCT01035437 - Study for Determination of Feasibility and Toxicity of Pre-Treatment With HPPH (2-1[1-Hexyloxyethyl]-2 Devinyl Pyropheophorbide-a) Photodynamic Therapy Prior to Chemoradiation in Non-Operable Patients With Obstructive Esophageal Cancer | Crick | Crick