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Stanley R. Riddell, MD

Dr. Riddell is an expert at treating lymphoma and myelodysplastic syndrome with bone marrow transplantation.

Patient Care Philosophy:

The challenge in cancer care in coming years is to translate the exciting discoveries in cancer biology into new techniques for patients to achieve the higher cure rates without reducing the quality of life.

Dr. Riddell's Resume


  • Member, Clinical Research Division, Fred Hutchinson Cancer Research Center
  • Professor, Medical Oncology Division, University of Washington School of Medicine

Clinical Expertise

Graft-versus-Host disease, adoptive transfer of T cells to treat human leukemia, immunobiology of breast cancer, immunobiology of human cytomegalovirus (CMV) infection, human immunodeficiency virus infection

Education And Training

  • University of Manitoba, 1979

More Information

For more information about Dr. Stanley R. Riddell's clinical and research expertise, click here.

Dr. Riddell's Story

In a perfect world, cancer doesn't stand a chance of wreaking havoc. Like a soldier guarding the home shores, the immune system gives marching orders to white blood cells known as T-cells to remain vigilant for an invasion of foreign cells, including cancerous ones. When a T-cell recognizes an invader, it initiates a process that targets that cell for destruction.

But cancer is a formidable foe, one that Stanley Riddell, MD is all too familiar with after more than two decades of waging war against it.

"Tumors are very clever, and they utilize evasion strategies to limit the effectiveness of the immune response," he said.

So he's fortifying the immune system with better weapons: long-living T-cells specially engineered to seek and destroy cancer.

Through adoptive T-cell therapy, Dr. Riddell 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.

"When you see it work, it is so amazing-the bone marrow just goes from being full of leukemia to being in remission, and very large tumors simply melt away," Dr. Riddell said.

T-cells, however, have a fatal flaw. They die quickly. And if an immune response isn't sustained, cancer eventually comes back.

Dr. Riddell and his colleagues knew immunity could last a lifetime-that's how vaccines work. So the researchers reasoned that perhaps they were starting with the wrong T-cells. They began advanced testing on different types of T-cells and found that one type-central memory cells-had the staying power the scientists were seeking. They now had a sustainable starting point for cancer immunotherapy: T-cells with the capacity to survive.

The approach holds promise for fighting different types of leukemia, including chemotherapy-resistant acute lymphoblastic leukemia in children, and breast, ovarian and skin cancers. Dr. Riddell's team's insights may also strengthen the work of University of Washington researchers developing potential breast-cancer vaccines.

"We're really trying to move immunotherapy with central memory T-cells into the clinic quickly," Dr. Riddell said. "We are excited by the potential for success and believe that this therapy can be applied to several types of cancer."