William Chapman Jr., MD, MPHS

Colorectal Surgeon

William Chapman Jr.

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

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

  • Colon and Rectal Surgery

Primary Academic Title

Assistant Professor of Surgery, Colon and Rectal Surgery, WashU Medicine

Training

  • 2023: Fellowship: Colon and Rectal Surgery, Cleveland Clinic, Cleveland, OH
  • 2018 - 2022: Residency: General Surgery, WashU Medicine, St. Louis, MO

Education

  • 2018: MPHS, WashU Medicine, St. Louis, MO
  • 2015: MD, 2015 Georgetown University School of Medicine, Washington, DC

Research & Selected Publications

Research Interest

Rectal cancer, colon cancer, patient reported outcomes in colorectal surgery

Research Publications

Brave New World: Analysis of Early Clinical Experience With Molecular Sequencing in the Treatment of Rectal Cancer
Authors:

Yee JT, Eltahir AA, Oduyale OK, one or more additional authors omitted Chapman WC

Journal & Year:

Dis Colon Rectum | 2025

Research Perspective on Role of Neoadjuvant Immune Checkpoint Inhibitors in Locally Advanced Rectal Cancer: A Systematic Review of Currently Available Studies
Authors:

Chapman WC

Journal & Year:

Dis Colon Rectum | 2025

ASO Author Reflections: De-escalation of Rectal Cancer Management and Expansion of Nonoperative Surveillance Protocols
Authors:

Zivanov CN, Chapman WC

Journal & Year:

Ann Surg Oncol | 2025

Nonoperative Management of Rectal Cancer: Is "Near-Complete" Response Safe to Surveil?
Authors:

Zivanov CN, Kau NS, Nalluri-Butz H, one or more additional authors omitted Chapman WC

Journal & Year:

Ann Surg Oncol | 2025

"Watch-and-Wait" or "Lost to Follow-Up"? Adherence to Nonoperative Management of Rectal Cancer
Authors:

Rubens M, Oduyale O, Eltahir AA, one or more additional authors omitted Chapman W

Journal & Year:

J Surg Res | 2025

ASO Visual Abstract: Nonoperative Management of Rectal Cancer: Is "Near-Complete" Response Safe to Surveil?
Authors:

Zivanov CN, Kau NS, Nalluri-Butz H, one or more additional authors omitted Chapman WC

Journal & Year:

Ann Surg Oncol | 2025