John L. Marshall, MDJohn L. Marshall, MD, is director of the Otto J. Ruesch Center for the Cure of Gastrointestinal Cancer; associate director for clinical care at the Lombardi Comprehensive Cancer Center; and professor and chief of the Division of Hematology/Oncology at Georgetown University, Washington, DC. A global leader in research for colon cancer and other GI cancers, he is the principal investigator of over 150 clinical trials.

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Marshall on Oncology