During the chemoradiation phase, you will receive gemcitabine over about 35 minutes 1 time each week for 5 weeks. You will also receive radiation therapy 5 days a week (Monday through Friday) for 5 1/2 weeks (a total of 28 treatments). If you miss any of the days of radiation, they will be made up at the end of treatment so that you will receive the full amount of radiation. You will be given a separate consent form that explains the radiation procedure and the risks it may present.