Cassandra Fritz, MD, MPHS

Gastroenterologist

Cassandra Fritz

Appointment Options

Whether you’re seeking a new patient appointment or exploring treatment options and looking for a second opinion, our Siteman care coordinators are ready to assist you.

My Locations

Center for Advanced Medicine

Center for Advanced Medicine

On WashU Medicine Campus
4921 Parkview Place, Saint Louis, MO 63110
Siteman Cancer Center at Barnes-Jewish West County Hospital

Siteman Cancer Center at Barnes-Jewish West County Hospital

Medical Office Building 2, 10 Barnes West Drive, Creve Coeur, MO 63141

Expertise & Training

Clinical Expertise

  • Gastroenterology

Primary Academic Title

Assistant Professor, Department of Internal Medicine, Division of Gastroenterology, WashU Medicine

Board Certification

  • 2019: American Board of Internal Medicine, Internal Medicine
  • 2022: American Board of Internal Medicine, Gastroenterology

Training

  • 2015 - 2016: Internship, Internal Medicine, WashU Medicine, St. Louis, MO
  • 2016 - 2018: Resident, Internal Medicine, WashU Medicine, St. Louis, MO
  • 2018 - 2019: Chief Resident, Instructor of Medicine, Department Medicine, WashU Medicine, St. Louis, MO
  • 2019 - 2022: Fellowship, Gastroenterology, WashU Medicine, St. Louis, MO

Education

  • 2015: MD, The University of Chicago Pritzker School of Medicine, Chicago, IL
  • 2022: MPHS, WashU Medicine, St. Louis, MO

Research & Selected Publications

Research Interest

Dr. Fritz’s research interest focuses on improving disparities in luminal gastrointestinal(GI) cancers through health outcomes research and health equity educational initiatives for trainees. Dr. Fritz’s T32 research fellowship, under the mentorship of Dr. Yin Cao, included an assessment of risk factors and signs & symptoms associated with early-onset colorectal cancer. Current projects are focused on colorectal cancer screening and surveillance, specifically within underserved patient populations in St. Louis. Dr. Fritz’s long-term goals are to work to improve health outcomes in GI cancer prevention among historically marginalized racial/ethnic populations and high-risk populations.

Research Publications

Approach Toward Early Detection and Prevention of Early-Onset Colorectal Cancer
Authors:

Fritz CDL, George M, Carethers JM, Cao Y

Journal & Year:

Annu Rev Med | 2026

Characterizing racial disparities in follow-up care after open-access colonoscopy
Authors:

Lenyo A, Liu KS, Hornbuckle K, one or more additional authors omitted Fritz CDL

Journal & Year:

IGIE | 2025

Opportunities for Improving System-Level Barriers to Biomarker Testing for Metastatic Colorectal Cancer
Authors:

Adekunle AD, Coombs S, Fritz CDL

Journal & Year:

JAMA Netw Open | 2024

Overcoming Racial and Ethnic Disparities in Rectal Cancer Treatment
Authors:

Fritz CDL, Oduyale O, Cao Y

Journal & Year:

JAMA Netw Open | 2024

Red-flag signs and symptoms for earlier diagnosis of early-onset colorectal cancer
Authors:

Fritz CDL, Otegbeye EE, Zong X, one or more additional authors omitted Cao Y

Journal & Year:

J Natl Cancer Inst | 2023