Marnee Spierer,MD


Chief of Staff & Chief of Radiation Oncology, CTCA Phoenix

5 (43 Ratings)

14 Reviews
Marnee Spierer - Chief of Staff & Chief of Radiation Oncology

It is an honor to be part of such a dedicated team focused on the care of our patients.

CTCA Phoenix
Radiation Oncology
Medical school:
Columbia University College of Physicians and Surgeons, New York, NY
Internship - Saint Barnabas Medical Center, Livingston, NJ
Radiation Oncology - Memorial Sloan Kettering Cancer Center, New York, NY
Advanced degrees:

MA - Columbia University Teachers College, New York, NY
MBA - University of Michigan Ross School of Business, Ann Arbor, MI

Radiation Oncology - American Board of Radiology

“The dedication here not only to cancer medicine but also to quality cancer care is a rare gift,” says Dr. Marnee Spierer, a radiation oncologist and Chief of Staff and Chief of Radiation Oncology at Cancer Treatment Centers of America ® (CTCA), Phoenix. “I wanted to be part of the effort.”

Dr. Spierer completed a bachelor’s degree at the University of Michigan in Ann Arbor in 1991 and a master’s degree at Teachers College of Columbia University in New York City in 1994. Deciding to pursue a career in medicine, Dr. Spierer attended the post-baccalaureate premedical program at Bryn Mawr College in Bryn Mawr, Pennsylvania. She earned a medical degree from Columbia University College of Physicians Surgeons in 2000.

After completing a general residency at Saint Barnabas Medical Center in New Jersey, Dr. Spierer completed a radiation oncology residency at Memorial Sloan Kettering Cancer Center in New York City.

Dr. Spierer served as a residency training program director, assistant professor and radiation oncologist at a medical center in the Bronx, New York. Additionally, she was a partner in a private radiation oncology practice in New York City. She joined CTCA® in April 2014.

Dr. Spierer is board certified in radiation oncology by the American Board of Radiology. She is a member of the American Society for Therapeutic Radiology and Oncology and the American Board of Radiology. Over the years, Dr. Spierer has received several awards. She also serves as Clinical Assistant Professor in the Department of Interdisciplinary Oncology at the University of Arizona College of Medicine in Phoenix. 

A dedicated researcher, Dr. Spierer has presented study findings at numerous local and national clinical meetings. Her investigations have focused on post-mastectomy radiation, soft tissue sarcoma, women’s oncology and radiation for childhood sarcoma, among other areas. She has served as a principal investigator and co-principal investigator for clinical trials and has published research in prominent, peer-reviewed medical journals. She has also contributed chapters to several radiation oncology books. Over the years, she's been recognized many times as one of Castle Connolly's Top Doctors®, most recently in 2021.

Dr. Spierer was drawn to the environment at CTCA. “Cancer treatment can be difficult,” she says, “but the care teams at CTCA attempt to make it as pleasant as possible.”

Dr. Spierer credits the support of her family for playing an integral part in the care she provides to her patients every day.

Patient Ratings
The patient ratings and comments on this page are obtained from an external Press Ganey® outpatient survey provided to all eligible CTCA patients within one to two weeks of their treatment occurrence. Raw data from the answers to the survey questions about our physicians are calculated by Press Ganey into a one- to five- star rating. In the spirit of transparency, all patient comments are posted as written by the patient, whether they are positive or negative. We only exclude comments if they are deemed to be slanderous or libelous, contain profanity or vulgar language, or do not relate to the patient's experience with the doctor involved including comments directed at hospital COVID-19 policies and procedures. As a result, the comments are the views and opinions of the patients surveyed and are not endorsed by, and may not necessarily reflect the opinion of, CTCA.
About our ratings
Aug 2, 2021


"*Dr. Spierer is great!"
Jul 20, 2021


"*Dr. Spierer is very informative an excellent dr. She shows care & concern for her patients. Thanks *Dr. Spierer."
Jul 15, 2021


"*Dr. Spieres is knowledgeable, caring & communicates very well!"
Jul 2, 2021


Jun 25, 2021


"*Dr. Spierer is just the very best! She has my 100% confidence and gratitude!"
May 25, 2021


"*Dr. Spierer's compassion for and care was exceptional! After one procedure she stayed in Recovery with me for over 45 min. I had a bad reaction to anesthesia. Other than that time *Dr. Spierer would always listen and give clear explanations of what to expect! She is a GEM! 10+."
May 10, 2021


"*Dr. Spierer has a terrific sense of humor, is very kind and patient. Ultimate professional! Very knowledgeable."
Apr 29, 2021


"Love *Dr. Spierer!"
Apr 28, 2021


Apr 27, 2021


"Best ever. Always takes the time to answer questions and goes above and beyond."
Apr 26, 2021


"Explains everything how I can understand. Saw my test results of a blood clot and made oncologist aware of test results to do immediate action."
Apr 21, 2021


"Dr Spierer and staff was awesome!"
Mar 11, 2021


"*Dr. Spierer is very attentive. She talks with you not at you. She treats you as an individual."
Jan 15, 2021


"*Dr. Sperier could not have been kinder or more forth coming w/info."