1. Department of Pathology, University of Newcastle upon Tyne, Royal Victoria Infirmary, Queen Victoria Road, Newcastle upon Tyne NE1 4LP, U.K., Northern Institute for Cancer Research, School of Clinical and Laboratory Sciences, The Medical School, University of Newcastle upon Tyne, Newcastle upon Tyne NE2 4HH, U.K., and Northern Oesophago Gastric Cancer Unit, Royal Victoria Infirmary, Queen Victoria Road, Newcastle upon Tyne NE1 4LP, U.K.