
At Prigge Radiation Oncology Center in Modesto, California, we strive to
offer the best in patient care, the latest in treatment
modalities, and the state-of-the-art technology
needed to provide outstanding care to cancer
patients in the San Joaquin Valley.
Dr. Peter K. Sien, M.D., M.S.H.A. leads our qualified
team of nurses, therapists, medical physicists,
dosimetrists and front office team members
who are devoted to providing personalized and
compassionate care in a comfortable environment.

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Dr. Peter K. Sien
Peter K. Sien, M.D., M.S.H.A., is a board-certified radiation oncologist with 30 years of clinical experience. He attended medical school at the Medical College of Wisconsin and did his internship and residency at the University of California in San Francisco. Dr. Sien later completed an Associate Fellowship in Integrative Medicine at the University of Arizona.
Dr. Sien became the Medical Director at Prigge Radiation Oncology Center in 2004 and is an active medical staff member at Doctor’s Medical Center, Memorial Medical Center, and Emanuel Medical Center. |

Prigge Radiation Oncology Center provides patients with some of the most advanced treatment technologies available in the healthcare industry. Some of the treatments and technologies available at Prigge Radiation Oncology Center include:
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Intensity Modulated Radiation Therapy (IMRT) – a sophisticated type of external beam radiotherapy which allows delivery of precisely targeted radiation beams to tumors, while sparing the surrounding healthy organs and tissues.
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Image Guided Radiotherapy (IGRT) – visualized CT scans that verify target locations immediately before treatment delivery. In conjunction with IMRT, this allows for unprecedented accuracy in delivering radiotherapy.
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Three-Dimensional Conformal Radiation Therapy (3D-CRT) – a sophisticated set of computer assisted tomography scans (CT or CAT scans) and/or magnetic resonance imaging scans (MR or MRI scans) that create detailed, three-dimensional representations of tumors and surrounding organs for precise delivery of radiation beams to the exact
size and shape of the tumor.
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High Dose Rate Brachytherapy (HDR) – an innovative form of internal radiotherapy that places radioactive materials directly
in contact with cancer tissues using catheters or wires, which are then removed when
a curative dose has been delivered to the cancer. This comprehensive, aggressive
approach to treatment ensures the maximum radiation dose is given where you need it
most, while sparing the healthy surrounding tissue.
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Accelerated Partial Breast Irradiation – a highly targeted procedure performed after
a lumpectomy that uses a catheter (or catheters) to insert a radiation seed directly into the
breast for a few minutes, twice a day for five days. After each treatment, the seed is
removed and no radiation remains in the breast between treatments.

Prigge Radiation Oncology Center
1316 Nelson Ave.
Modesto, California 95350
Phone: (209) 575-5870
Fax: (209) 575-5872
Online: www.priggeradiationoncology.com
Map:
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