Stanley R. Riddell M.D. Accepting new patients

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Medical oncology




Stanley Riddell, M.D., is a board certified oncologist at SCCA.

Dr. Riddell is an expert at treating lymphoma and myelodysplastic syndrome with bone marrow transplantation. He working to fortify the immune system with better weapons: long-living T-cells specially engineered to seek and destroy cancer. 

Dr. Riddell earned his M.D. from the University of Manitoba. Through adoptive T-cell therapy, he and his fellow researchers extract white blood cells from a cancer patient and expose them to proteins made in abundance by tumor cells. Scientists then identify the few T-cells that recognize the tumor proteins and stimulate those to divide, generating a billions-strong population of cancer-fighting cells that can be infused back into the patient. Ideally, this unique population of T-cells will find its way to the tumor site and annihilate the cancer cells.

Personal Interests

In his free time Dr. Riddell enjoys cycling, running, theater and parenting.
Seattle Cancer Care Alliance at South Lake Union

Seattle Cancer Care Alliance at South Lake Union

825 Eastlake Ave. E Seattle, WA 98109


Breast cancer, Cancer care, Colorectal cancer, Gynecologic oncology

SCCA Outpatient Clinic at South Lake Union

825 Eastlake Ave E. Seattle, WA 98109


Cancer care, Oncology

Seattle Cancer Care Alliance Hospital at UWMC

825 Eastlake Ave. E Seattle, WA 98109-102


Cancer care, Oncology

Univ. of Manitoba Faculty of Med.

Medical education, 1979

UW - Medical Oncology Fellowship Program

Fellowship, Oncology

Manitoba Cancer Treatment & Research Foundation

Fellowship, Hematology

University of Manitoba, Dept. of Medicine

Internship, Internal Medicine

University of Manitoba, Dept. of Medicine

Residency, Internal Medicine


Board Certifications
  • Medical Oncology, 1987, American Board of Internal Medicine