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Stephanie Yoon,

M.D.

Radiation Oncologist

5 (67 Ratings)
Biography photo
Location
City of Hope Comprehensive Cancer Center - Duarte
1500 East Duarte Road
Duarte, CA 91010
Specialties
Radiation Oncology
Education
Medical school:

2017, M.D., Temple University Lewis Katz School of Medicine, Philadelphia, PA

Residency:

2018 – 2022, Residency, Radiation Oncology, University of California, Los Angeles, CA

Academic Appointments
  • Assistant Professor, Department of Radiation Oncology
  • Associate Program Director, Radiation Oncology Residency Program
About Me

Radiation oncologist Stephanie Yoon, M.D., treats breast cancer as well as tumors in the brain and spine at City of Hope® Duarte Cancer Center. She chose to focus on these areas because they affect how people think, feel and experience the world — the very things that make each person unique. For Dr. Yoon, being a doctor is more than a career; it’s a way to help people live fuller, more meaningful lives. She feels honored to care for patients during such a personal and vulnerable time. 

Dr. Yoon uses advanced radiation techniques to precisely target cancer while protecting healthy tissue and reducing side effects. These include MRI-guided radiotherapy, stereotactic radiosurgery (SRS), stereotactic body radiotherapy (SBRT), 3D image-guided radiotherapy and high-dose rate brachytherapy. As a researcher, she has published more than a dozen peer-reviewed studies. 

Passionate about making medicine more inclusive, Dr. Yoon held leadership roles during her residency at the University of California Los Angeles, including executive chair of the Radiosurgery Society Resident Association and executive board member of the Society for Women in Radiation Oncology.

Patient reviews
The patient ratings and comments on this page are obtained from an external Press Ganey® outpatient survey provided to all eligible City of Hope 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. 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, City of Hope.
Apr 30, 2026
"[...] It was a very good and professional talk. I appreciated Dr. Yoon's expertise. [...]"
Jan 12, 2026
5.0
"I gladly recommend this doctor, he is very good"
Nov 3, 2025
5.0
"One of the best hospitals with amazing staff"
Nov 3, 2025
5.0
"Provider was very informative, professional and knowledgeable. Spent time with me and answered all questions."
Sep 15, 2025
5.0
"I gladly recommend this hospital and Dr. Yoon"
Aug 20, 2025
5.0
"Always a good experience with Dr. Yoon."
Aug 20, 2025
5.0
"Dr. Yoon is very kind and caring and knowledgeable. She's the best! I really trust her and feel comfortable in her care."
Jul 19, 2025
5.0
"She spoke to me in way I was able to understand what was going on and she answered all my questions with honesty. She seems like she really cares about me and wants to make sure im prepared and comfortable with everything that is happening"
Jul 4, 2025
5.0
"Dr. Yoon was amazing. She explained how procedure would work, the benefits but also long term and short term side effects. Explained why im Grey area, but why my specific case would definitely benefit me. She was awesome enough to even repeat herself."
Jun 21, 2025
5.0
"I came from [...]. The difference is amazing"