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R. Alex Hsi, MD


Radiation Oncology

Call 425-899-1860

R. Alex Hsi, MD is accepting new patients.

Procedures Performed

SpaceOAR treatment for prostate cancer, stereotactic radiotherapy, prostate seed brachytherapy for prostate cancer, and radiation treatment for prostate cancer

Contact Information

  • Office: 425-899-1860
  • Fax: 425-899-1859







Interpretation Services Available

Board Certification

Board Certified in Radiation Oncology
Board Certified in Internal Medicine


Dr. R. Alex Hsi is a nationally recognized, board-certified radiation oncologist with more than 20 years of experience in cancer care, including prostate, lung, brain, GI, head and neck cancers.
Dr. Hsi is highly skilled in Prostate Seed Brachytherapy, and is one of the first physicians in the nation to use SpaceOAR gel, a device that advances the protection of healthy tissue during radiation therapies.
He is very involved in research for prostate cancer treatment, and shares his ongoing findings at
Dr. Hsi co-founded the Peninsula Cancer Center and spent 10 years in the Department of Radiation Oncology at Virginia Mason Medical Center in Seattle.

Clinical Expertise

Prostate cancer
SpaceOAR treatment for prostate cancer
Prostate seed brachytherapy
Lung cancer GI cancer
Skin cancer
Stereotactic body radiation therapy

Philosophy of Care

Radiation Oncology is a challenging and rewarding field. In the modern era of scientific, technology-oriented medicine, it's vital that we, as physicians, also remember to practice the art of medicine by perfecting our listening skills and working to understand all of your needs.

Medical School

University of Michigan Medical School | Ann Arbor, MI


University of Michigan (neurological surgery) | Ann Arbor, MI University of Pennsylvania Health System (radiation oncology) | Philadelphia, PA

Community Involvement

I give numerous volunteer hours to several patient advocacy groups.