Radiation Oncology at Celilo Cancer Center

Radiation oncology is the medical use of ionizing radiation as part of cancer treatment to control malignant cells. To spare normal tissues, shaped radiation beams are aimed from several angles to intersect at the tumor, providing a much larger dose there than in the surrounding, healthy tissue.

Celilo Cancer Center employs the most advanced radiation therapy technology available, intensity modulated radiation therapy (IMRT). Our Elekta Synergy linear accelerator combines CT scanning with IMRT to help Celilo’s radiation specialists even more precisely and effectively deliver the advanced IMRT technology.

The Synergy linear accelerator’s CT technology provides “3-D image-guided” (IGRT) capabilities that enable higher doses of radiation to be delivered more precisely to cancer tumors. This increases the daily accuracy of treatment and reduces the effect on surrounding tissue.  IGRT allows staff to more efficiently and effectively adjust for the body and organ movements that can occur during treatment


For many women diagnosed with breast cancer, radiation therapy is an effective, and far less physically and emotionally taxing, alternative to mastectomy. Several studies have shown that treatment combining tumor removal with external radiation therapy has produced the same cure rate as total breast removal.

Yet, despite the obvious advantages of radiation treatment, many women still choose to have mastectomies – often because of the long treatment regimen required for external radiation treatment.

At Celilo, however, breast cancer patients may benefit from a procedure called brachytherapy, which dramatically shortens the radiation therapy process to only five days, compared with the six weeks required for external radiation therapy. The procedure enables radiation specialists to deliver higher doses of radiation to very defined areas of the breast without affecting surrounding tissue.

For more information about Celilo Radiation Oncology please call (541) 296-7204.

Meet Dr. Keith Stelzer, Radiation Oncologist

Dr. Keith Stelzer, Radiation OncologistKeith Stelzer, MD, PhD

Dr. Keith Stelzer is a leading expert in the application of intensity modulated radiation therapy (IMRT) the technology used at Celilo that shapes radiation beams more precisely to spare surrounding tissue.

Dr. Stelzer graduated from the University of California Davis in 1981.  He received his Ph.D. in toxicology from the University of Kansas Medical Center in 1985 and his medical degree from the University of California, Los Angeles, in 1989.  Dr. Stelzer completed an internal medicine internship at St. Vincent Hospital in Portland and a radiation oncology residency at the University of Washington in Seattle, where he was chief resident from 1992 to 1993.

Dr. Stelzer was associate professor in the Radiation Oncology and Neurological Surgery departments at the University of Washington, and he continues as a clinical associate professor of Radiation Oncology at UW Medical Center.

Board certified by the American Board of Radiology (Therapeutic), Dr. Stelzer also is a member of the American Radium Society, the American Society for Therapeutic Radiology and Oncology, and the North American Society for Neuro-Oncology.

Survivor Stories

“They treat you like a person, not just a patient. When you are worrying about having cancer, you need people around you who are going to give you the best support possible. These are those people.”

Click here to read Misty’s story.

Misty Martin
Misty MartinCancer Survivor and Celilo Cancer Center patient

“I had the best care. It couldn’t have been better. I felt like I was their only patient.”

Click here to read TJ’s story.

TJ Miles
TJ MilesCancer Survivor and Celilo Cancer Center patient

“All the fear I had at first went away soon because everyone was so positive and supportive. No one ever told me Don’t do this or Don’t do that. They never told me my life was going to be changing completely. They just encouraged me to go ahead and do the things that were important to me.”

Click here to read Nadine’s story.

Nadine Brack
Nadine BrackCancer Survivor and Celilo Cancer Center patient

“They’ve really treated me well. It’s been everything you could want.”

Click here to read Dale’s story.

Dale Harris
Dale HarrisCancer Survivor and Celilo Cancer Center patient

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Contact Us

Celilo Cancer Center

1800 E. 19th St, The Dalles, OR

Ph: 541-296-7585