Our gastrointestinal team includes preeminent experts in the study, diagnosis and treatment of anal cancer.

To make an appointment, please call The James Line at 614-293-5066 or 800-293-5066. The James Line is a free, confidential telephone service staffed by oncology nurses to provide callers with cancer information and physician referrals. The James Line is available weekdays from 8 a.m. to 4:30 p.m.

Gastroenterology

Samer El-Dika, MD

Director of Endoscopic Quality and Outcomes Skilled in advanced therapeutic endoscopy Special interest in pancreatic and biliary disorders . Read More

Somashekar Krishna, MBBS, MPH

Advanced endoscopy training at MD Anderson Cancer Center, 2012 Director of Clinical Research, Gastroenterology, Hepatology and Nutrition Department, 2013. Read More

Jon Walker, MD

Rated in the top 10 percent of physicians in the nation for patient satisfaction, 2014, 2015, 2016. Read More

Medical Oncology

Kristen Ciombor, MD

I’m a medical oncologist who treats patients with all types of gastrointestinal cancers, which include colorectal, small bowel, esophageal, gastric, liver, pancreatic, biliary, anal and neuroendocrine tumors. Read More

John Hays, MD, PhD

I specialize in treating peritoneal cancers stemming from gastrointestinal and gynecological origins such as ovarian, colorectal cancer and cancers of the appendix and small intestine. Read More

Anne Noonan, MBBCh

I’m a medical oncologist focusing on breast cancer and gastrointestinal malignancies such as esophageal, pancreatic and colorectal cancers, as well as hepatocellular carcinoma. Read More

Sameek Roychowdhury, MD, PhD

As a medical oncologist I specialize in treating patients with advanced prostate and colorectal cancers, including soft tissue sarcoma. Read More

Manisha Shah, MD

I’m a medical oncologist specializing in treating patients with neuroendocrine, thyroid and adrenal cancers. Read More

Surgical Oncology

Sherif Abdel-Misih, MD

Rated in the top 10 percent of physicians in the nation for patient satisfaction, 2016. Read More

Carl Schmidt, MD

Rated in the top 10 percent of physicians in the nation for patient satisfaction, 2014, 2016. Read More

Mary Dillhoff, MD

I’m a surgical oncologist with a specialty in diagnosing and treating patients with tumors of the liver, bile duct, pancreas and stomach. Read More

General Surgery

E. Christopher Ellison, MD

Rated in the top 10 percent of physicians in the nation for patient satisfaction, 2014, 2015 Zollinger’s Atlas of Surgical Operations Former Chair, American Board of Surgery Past Secretary, American Surgical Association Chair Advisory Council for General Surgery, American College of Surgeons. Read More

Kyle Perry, MD

Co-Director, Minimally Invasive and Bariatric Surgery Fellowship Associate Director for Research, Center for Minimally Invasive Surgery Fellow of the American College of Surgeons, 2011. Read More

Radiation Oncology