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Summary
William Breen, M.D., is a radiation oncologist at Mayo Clinic in Rochester, Minnesota, and Associate Research Chair in the Department of Radiation Oncology. He specializes in the treatment of brain tumors, lung cancer, lymphoma, and other central nervous system disorders using advanced radiation therapies, including proton therapy, intensity-modulated radiation therapy (IMRT), stereotactic body radiotherapy (SBRT), total skin electron beam therapy, and orthovoltage radiotherapy. Dr. Breen is actively involved in clinical research and clinical trials focused on immunotherapy and advanced imaging technologies, helping advance innovative, personalized cancer care within Mayo Clinic’s multidisciplinary cancer program.
Quick Facts
- accepting new patients
- 9 years of experience
- speaks English
- Mayo Clinic Alix School Of Medicine
- 2 specialties
- 1 area of expertise
- 2 hospital affiliations
- 1 office location
- Male
Office Location
William Breen
200 1st St SwRochester, MN 55905 Tel: (507) 512-8726
Mon7:00 am - 6:00 pm
Tue7:00 am - 6:00 pm
Wed7:00 am - 6:00 pm
Thu7:00 am - 6:00 pm
Fri7:00 am - 6:00 pm
SatClosed
SunClosed
Compare with Similar Doctors
 |  |  | |
| William Breen, MD | Daniel Keith Ebner | Jessica Frances Burlile | Keaton Rummel |
| Radiation Oncology | Radiation Oncology | Radiation Oncology | Radiation Oncology |
| Accepts New Patients | Accepts New Patients | Accepts New Patients | Accepts New Patients |
| 9 Years of Experience | 6 Years of Experience | 6 Years of Experience | 3 Years of Experience |
| No Virtual Visit Option | No Virtual Visit Option | No Virtual Visit Option | No Virtual Visit Option |
| Speaks English | |||
| Rochester , MN | Rochester , MN | Rochester , MN | Rochester , MN |
| Med School: Mayo Clinic Alix School Of Medicine | Med School: Warren Alpert Medical School Of Brown University | Med School: Georgetown University School Of Medicine | Med School: University Of North Dakota School Of Medicine & Health Sciences |
Current Profile | View Profile | View Profile | View Profile |
Insurance Plans Accepted by William Breen
Medical Specialties
William Breen has the following 2 specialties
Specialty Expertise
William Breen has the following area of expertise
Certifications, License, & Education
9 Years Experience
William Breen holds an expired medical license in the state of Minnesota.
Medical License
Medical Doctor with an expired medical license in the state of Minnesota that expired in 2025.
Education & Training
Medical School
Graduated from Mayo Clinic Alix School Of Medicine in 2017.
NPI Number
William Breen's NPI number is 1437683562.
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Frequently Asked Questions
- Does William Breen accept my insurance?
- You can see the insurance plans that William Breen accepts on their Vitals profile.
- Is William Breen accepting new patients?
- William Breen is accepting new patients on Vitals. View William Breen's profile on Vitals to make an appointment.
- Which hospitals is William Breen affiliated with?
- William Breen is affiliated with Mayo Clinic Hospital Methodist Campus and Mayo Clinic Hospital Saint Marys Campus.
- Does William Breen accept virtual/telehealth appointments?
- William Breen has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
- What languages does William Breen speak?
- William Breen speaks English.
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