David C. Beyer, M.D., F.A.S.T.R.O., F.A.C.R.O., F.A.C.R.

Dr. Beyer’s primary clinical interests focus on prostate cancer and prostate brachytherapy including seed implants, and high dose rate brachytherapy. He has comprehensive experience in intensity modulated radiation therapy and image guidance radiation therapy. He is a frequent lecturer at implant training courses and medical meetings, and has published extensively results in prostate treatment.
Dr. Beyer is the medical director for Arizona Oncology Services, Physicians. He is an editorial board member of the Journal of Brachytherapy and has served on the board of directors for the American Society for Radiology Oncology, the Board of Chancellors of the American College of Radiation Oncology, and is a past president of the American Brachytherapy Society. Currently he represents the specialty of radiation oncology on the Council Steering Committee of the American College of Radiology and serves as advisor to the Current Procedural Terminology Editorial Panel of the American Medical Association.

Dr. Beyer earned his medical degree from the University of Arizona, College of Medicine after studying electrical engineering at the Massachusetts Institute of Technology. He joined Arizona Oncology Services in 1985 after serving consecutive residencies in both internal medicine and radiation oncology at the University of Arizona Health Sciences Center and University of California, Los Angeles. He is a member of Alpha Omega Alpha Honorary Society. Dr. Beyer is a Fellow of the American College of Radiation Oncology, the American College of Radiology, and the American Society for Therapeutic Radiology and Oncology.

He is board certified in radiation therapy by the American Board of Radiology in in internal medical by the American Board of Internal Medicine. Although he holds a lifetime board certification, Dr. Beyer is a participant in Maintenance of Certification, a voluntary program that improves physician knowledge and demonstrates a commitment to lifelong learning.


Deborah Lindquist, M.D., F.A.C.P.

Deborah Lindquist, M.D., serves as research leader for the Arizona Oncology practices in Northern Arizona, which include locations in Sedona, Flagstaff and Prescott Valley. She was the principal investigator for the U.S. Oncology Network in clinical trials for metastatic breast cancer and adjuvant therapy for breast cancer, and is currently conducting a study for metastatic breast carcinoma. Dr. Lindquist is on the forefront of genetic testing for patients in the community, helping determine inherited tendencies toward developing a particular type of cancer.  
Dr. Lindquist received her medical degree from the University of Nebraska College of Medicine after earning a bachelor’s in zoology from the University of Nebraska-Lincoln and a bachelor’s in medical terminology from the University of Nebraska Omaha. She completed an internship and residency in internal medicine at the University of Minnesota Hospitals and Clinics, and a fellowship in hematology and medical oncology at the University of Iowa Hospitals & Clinics. Dr. Lindquist is board certified in internal medicine, medical oncology and hematology.

Before starting a practice in Sedona and the Verde Valley in 1989, Dr. Lindquist was an assistant professor at Boston University, and was on the medical staff of Boston Veterans Affairs Medical Center and Emerson Hospital. She is a past board member of the Sedona American Cancer Society and has been an I Can Cope® program facilitator.

Dr. Lindquist joined the Verde Valley Medical Center medical staff in 1989 and obtained admitting privileges at Flagstaff Medical Center in 1992. She has been a clinical lecturer at the University of Arizona College of Medicine since 1993.

Dr. Lindquist is a fellow of the American College of Physicians and a member of the American Society of Clinical Oncology, the American Society of Hematology and the American Society for Breast Disease. 

Ongoing Communication

  • The radiation oncologists keep your primary care and specialty physicians fully informed of your progress through consultation and progress notes on a weekly basis.
  • Physicians also participate in clinical patient rounds with other sub-specialists.
  • An office coordinator is available to quickly answer non-medical questions and facilitate the services you need.
  • You can reach the radiation oncologists at 800-304-3004 or 928-204-4160 .

Nursing case management
Radiation oncology nursing services provide case management services for patients and their families. Services include assessment, monitoring and appropriate medical intervention for actual and potential problems related to the disease process and treatment. Specially trained nurses are available to meet with patient and/or family members to assist with any medical needs that may arise during the course of treatment.