My research goal is to improve treatment outcomes and reduce toxicity in patients with gastrointestinal malignancies by: (1) introducing and analyzing the use of cutting-edge radiation oncology technology, eg intensity-modulated radiotherapy, image-guided radiotherapy, and stereotactic body radiotherapy; (2) developing therapeutic protocols combining radiation, chemotherapy, and targeted agents for gastrointestinal cancer; and (3) investigating late effects of radiotherapy, including impact on quality of life.