Radiation Oncology


Kaiser Permanente Northwest’s oncology team at Interstate Radiation Oncology Center (IROC) utilizes radiation therapy to treat many types of benign and malignant tumors, as well as some non-cancerous conditions. Radiation therapy is the use of high-energy rays to destroy abnormal cells, typically cancer cells.

Our Radiation Oncology physicians collaborate closely with colleagues in other departments, including Medical Oncology, Surgery, Plastic Surgery, Urology, Neurosurgery, Gynecologic Oncology, Dermatology, Gastroenterology, and Thoracic Medicine to provide the highest quality cancer care. All of our physicians, physicists, therapists, nurses, and staff have been selected from an extremely, high qualified applicant pool, and are committed to the delivery of the highest quality and service-orientated care for each and every patient we serve.

Several systems used at Kaiser Permanente Interstate Radiation Oncology Center target tumors precisely, minimizing damage to normal tissues. These techniques and systems include:

  • Three-dimensional conformal radiation therapy (3D-CRT)
  • Intensity-modulated radiation therapy (IMRT)
  • Image-guided radiation therapy (IGRT)
  • Brachytherapy
  • Electronic portal imaging device (EPID)
  • Multileaf collimator (MLC)
  • On-board imager (OBI)
  • Stereotactic radiosurgery (SRS)
  • Stereotactic ablative body radiotherapy (SABR), also known as stereotactic body radiotherapy (SBRT)

The Interstate Radiation Oncology Center is located on the Kaiser Interstate Campus, adjacent to the Interstate Medical Oncology Department building. There is parking located next to the front entrance. Additionally, the MAX Yellow Line conveniently serves this location (Overlook Park Station).

Please visit our cancer care website for additional detailed information about our comprehensive oncology services at www.kpnwcancercare.org as we are committed to caring for the whole you—body, mind, and spirit—at every point in your treatment journey.