Xavier Llor, MD, PhD

Associate Professor of Medicine (Digestive Diseases); Medical Director, Colorectal Cancer Prevention Program; Co-Director, Cancer Genetics and Prevention Program

Departments & Organizations

Internal Medicine: Digestive Diseases

Cancer Center, Yale: Gastrointestinal Cancers Program | Genomics, Genetics, and Epigenetics

Office of Student Research

Yale Medical Group


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 60 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 bound to make a decisive contribution to the understanding of disparities in colorectal cancer.

Dr. Llor is the Medical Director of the Colorectal Cancer Prevention Program at Yale University and Smilow Cancer Center and he sees patients at Yale. He is a member of the leadership council and Chair of the International 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
Board Certification AB of Internal Medicine, Gastroenterology (2007)

Honors & Recognition

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

Professional Service

  • International Committee American Gastroenterological Association (2012 - 2015)

  • Leadership Cabinet American Gastroenterological Association (2012 - 2015)

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Contact Info

Xavier Llor, MD, PhD
Patient Care Locations
Yale Digestive DiseasesTemple Medical Center
40 Temple Street, Ste Suite 1A

New Haven, CT 06510
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Smilow Cancer HospitalYale-New Haven Hospital
20 York Street, Ste 8th Floor

New Haven, CT 06510
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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
333 Cedar Street/LMP 1080
PO Box 208019

New Haven, CT 06520-8019

Curriculum Vitae