Meet the Gastrointestinal Cancer Team

The Gastrointestinal Oncology Program specializes in treating and caring for patients with cancers in the digestive system. The program's multidisciplinary team includes gastroenterologists, surgical oncologists, medical oncologists, radiation oncologists, radiologists, interventional radiologists, nurses, and a genetic counselor.


H. Richard Alexander Jr., MD
Professor of Surgery

Cherif Nazmy Boutros, MD, MSc
Associate Professor of Surgery

Steven I. Hanish, MD
Associate Professor of Surgery

Nadar N. Hanna, MD, FACS, FICS
Professor of Surgery

Andrea Chao Bafford, MD
Assistant Professor of Surgery

Richelle Williams, MD
Assistant Professor of Surgery

Medical Oncology:

Yixing Jiang, MD, PhD
Associate Professor of Medicine

Petr F. Hausner, MD, PhD
Associate Professor of Medicine

Dan Zandberg, MD
Assistant Professor of Medicine

Radiation Oncology:

Adeel Kaiser, MD
Assistant Professor of Radiation Oncology


William F. Regine, MD, FACR, FACRO
Isadore and Fannie Schneider Foxman Chair and Professor of Radiation Oncology


Peter E. Darwin, MD
Associate Professor of Medicine


Bruce Greenwald, MD
Professor of Medicine
Associate Head for Clinical Affairs


Barry D. Daly, MD
Professor of Diagnostic Radiology and Nuclear Medicine

GI Program Coordinator:

Medhat M. Nagib, MBBCh

Nurse Practitioner:

William Setley, CRNP

LaToya Taylor, CRNP

Core Resources

Genetic Counseling:


Jessica Scott
Certified Genetic Counselor

Clinical Nutrition Services:


Jenny Taylor, RD, LDN, CNSD
Senior Dietitian

Psychosocial Services:


Patricia Widra, MD
Clinical Assistant Professor of Psychiatry

If you would like to schedule an appointment, or if you are a physician with a patient who would benefit from the Center's expertise and treatment, call us at 1-800-888-8823.