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Gastrointestinal Cancer Program

Anschutz Medical Campus

Gastrointestinal Cancer Research Labs

Messersmith Lab                      Pitts Lab                       Weekes Lab 

Gastrointestinal Cancer Clinical & Research Faculty


 Aik-Choon Tan PhD

Associate Professor



 W.Thomas Purcell MD, MBA

Associate Professor/ Executive Medical Director



Professor With Tenure, Head, Division of Medical Oncology, Directir, GI Program

 John Tentler PhD

Associate Professor



Stephen Leong MD

Associate Professor



 Christopher Lieu MD

Assistant Professor



Alyce Kantner RN, BSN, MHA, ONC, NP-C

Instructor/Nurse Practitioner




Rebecca Powell BS, MMS, PA-C

Instructor/Nurse Practitioner




Colin D. Weekes MD, PhD

Associate Professor





 Anne L. Leyba ANP-BC, AOCNP





 Todd Pitts PhD

Assistant Research Professor