Our Physician

Peter K. Sien, M.D., M.S.H.A.

Dr. Sien is a board certified radiation oncologist with more than 31 years of clinical experience.  He attended medical school at the Medical College of Wisconsin, graduating in 1975.  He completed his internship and residency at the University of California, San Francisco, graduating in 1979.  Additionally, Dr. Sien completed an Associate Fellowship in Integrative Medicine at the University of Arizona, Tucson in 2004. 

Dr. Sien became the Medical Director at Prigge Radiation Oncology Center in 2004.  He is an active medical staff member at Doctor’s Medical Center in Modesto, Memorial Medical Center in Modesto, and Emanuel Medical Center in Turlock, California.