This year, approximately 40% of the 28,300 patients diagnosed with pancreat
ic carcinoma in the United States will present with focally advanced diseas
e. Radiotherapeutic approaches are often employed, as these patients have u
nresectable tumors by virtue of local invasion into the retroperitoneal ves
sels in the absence of clinically detectable metastases, These treatments i
nclude external-beam irradiation with and without fluorouracil (5-FU)-based
chemotherapy, intraoperative irradiation, and more recently, external-beam
irradiation with new systemic agents, such as gencitabine (Gemzar).