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Xavier Llor, MD, PhD

Professor of Medicine; Associate CEHE Director for Cancer Screening, Smilow Cancer Hospital; Medical Director, Cancer Screening and Prevention Program, and Colorectal Cancer Prevention Program; Co-Director, Cancer Genetics and Prevention Program

Contact Information

Xavier Llor, MD, PhD

Patient Care Location

Mailing Address

  • Digestive Diseases

    333 Cedar Street/LMP 1080, PO Box 208019

    New Haven, CT, 06520-8019

    United States



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. Watch a video with Dr. Xavier Llor >>

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

AwardAwarding OrganizationDate
Mentor, Future Leaders ProgramAmerican Gastroenterological Association2016
Distinguished MentorHispanic Center of Excellence. University of Illinois at Chicago School of Medicine2012

Professional Service

American Gastrointestinal AsociationMember, Nominating Committee2016 - Present
American Gastroenterological AssociationChair, Education and Training Committee2016 - Present
American Gastroenterological AssociationLeadership Cabinet Member2012 - Present
American Association for Cancer Research2010 - Present

Departments & Organizations