Eileen M. O'Reilly, MD - MSK Gastrointestinal Medical Oncologist

I am a surgeon who cares for people with cancers of the colon, rectum, anus, appendix, and peritoneum. I also serve as the Vice President of Quality and Safety where I am responsible for managing MSK’s clinical quality, patient safety, and infection control.

I am a medical oncologist who specializes in the treatment of patients with gastrointestinal cancers. My research interests focus on the development of new therapies. In particular, I am investigating innovative ways to use the immune system to treat cancer.

I am a board-certified medical oncologist caring for patients with cancer of unknown primary and gastrointestinal cancers, with a focus on pancreas cancer, colorectal cancer, and biliary cancers. I collaborate with a multidisciplinary team of medical oncologists, surgeons, radiation oncologists, pathologists, radiologists, and other specialists to provide the best treatment and personalized care for each patient.