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Advanced Primary Stroke Center
By the Joint Commission

Radiation Oncology

Detail about our service
Cancer Center

About Our Radiation Oncology Services

Within our hospital, our radiation oncology services stand as a cornerstone in the comprehensive care we provide for cancer patients. Our team of skilled radiation oncologists employs advanced technologies and treatment modalities to precisely target and eradicate cancer cells while minimizing impact on healthy tissues. From intensity-modulated radiation therapy (IMRT) to stereotactic radiosurgery, our state-of-the-art facilities enable us to deliver highly effective and individualized treatments. We prioritize a multidisciplinary approach, collaborating closely with medical oncologists, surgeons, and support staff to ensure seamless integration of radiation therapy into each patient’s overall care plan. Our commitment extends beyond treatment, encompassing ongoing monitoring, counseling, and support services to address the diverse needs of our patients throughout their cancer journey. In our radiation oncology department, we strive to combine expertise with empathy, providing not only cutting-edge technology but also a compassionate and supportive environment for individuals undergoing radiation therapy.

GRMC’s Radiation Oncology department uses the latest technologies which enable our specialists to treat cancerous cells with pinpoint accuracy and minimal damage to healthy tissues. Radiation therapy can damage normal cells, leading to side effects.

“TrueBeam” linear accelerator: This technology provides GRMC with the highest quality radiation therapy on Guam. The “TrueBeam” linear accelerator targets cancer cells with exact precision, protecting healthy cells and allowing our patients to resume their normal, healthy lives sooner.

The conditions we treat at Radiation Oncology include:

  • Bladder cancer
  • Bone tumors
  • Soft tissue sarcomas
  • Brain tumors
  • Breast cancer
  • Cervical cancer
  • Colon cancer
  • Esophageal cancer
  • Endometrial cancer
  • Kidney cancer
  • Liver cancer
  • Lymphomas
  • Ovarian cancer
  • Pancreatic cancer
  • Prostrate cancer
  • Sinus, Mouth
  • Skin Cancer
  • Stomach cancer
  • Testicular cancer

Our Doctors

Gregory Woodard

Nurse Practitioner

Elizabeth Tan-Chiu, M.D.

Oncologist, Hematologist

Sheri Tackett

Nurse Practitioner

William Ryan, M.D.


Aaron T. Ranck, DNP


Paul Coty, M.D.


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