Xavier Llor, MD, PhD

Professor of Medicine; Medical Director, Cancer Screening and Prevention Program, and Colorectal Cancer Prevention Program; Co-Director, Cancer Genetics and Prevention Program

Departments & Organizations

Internal Medicine: Digestive Diseases: GI Cancer Genetics & Prevention Program; Pancreatic Diseases Program

Yale Cancer Center: Gastrointestinal Cancers Program | Genomics, Genetics, and Epigenetics | Smilow Cancer Genetics & Prevention Program | Smilow Screening & Prevention Program

Yale Medicine


After obtaining his MD degree from the Autonomous University Barcelona, Dr. Llor trained in basic research and Internal Medicine at the University of Chicago and completed his GI fellowship at the University of Illinois at Chicago. He complemented his training with a PhD degree in molecular biology from the University of Barcelona. A clinically active gastroenterologist, Dr. Llor’s research and clinical interests relate to colorectal cancer. He has a very active basic and translational research program mainly focusing on two different aspects of colorectal cancer: hereditary and familial forms, and disparities in colorectal cancer. This work has resulted in over 70 scientific publications in this field. He has made seminal contributions to the field of Lynch syndrome diagnosis as well as in the definition of other non-polyposis syndromic colorectal cancer cases. Some of his most recent work is providing important clues to the understanding of the biological differences that contribute to disparities in colorectal cancer.

Dr. Llor is the Co-Director of the Smilow Cancer Genetics and Prevention Program and the Medical Director of the Colorectal Cancer Prevention Program at Yale University and Smilow Cancer Hospital and he sees patients at Yale. He is a member of the leadership council and Chair of the Education and Training Committee of the American Gastroenterological Association. He is commonly invited to lecture in colorectal cancer genetics in the US and abroad.

Education & Training

PhD University of Barcelona, Molecular Biology (1999)
MD University of Barcelona (1986)
Fellowship University of Illinois
Residency Lutheran General Hospital-University of Chicago Program C

Honors & Recognition

  • Mentor, Future Leaders ProgramAmerican Gastroenterological Association (2016)

  • Distinguished MentorHispanic Center of Excellence. University of Illinois at Chicago School of Medicine (2012)

Professional Service

  • American Gastrointestinal Asociation (2016 - Present) Member, Nominating Committee

  • American Gastroenterological Association (2016 - Present) Chair, Education and Training Committee

  • American Gastroenterological Association (2012 - Present) Leadership Cabinet Member

  • American Association for Cancer Research (2010 - Present)

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Contact Info

Xavier Llor, MD, PhD
Patient Care Location
Cancer Genetics and Prevention ProgramYale New Haven Hospital Saint Raphael Campus
1450 Chapel Street, Ste 107/109

New Haven, CT 06511
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Mailing Address
Digestive Diseases333 Cedar Street/LMP 1080
PO Box 208019

New Haven, CT 06520-8019