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Gregory S. Sibley, MD

Radiation Oncologist

Portrait of Dr. Sibley for Virginia Cancer

Gregory S. Sibley, MD

Board Certifications

Radiation Oncology

Special Interests

Breast Cancer, Prostate Cancer, Lung Cancer, Radiation Oncology, Radiopharmaceuticals, Clinical Trials

Patient Reviews
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Fellowship

University of Chicago

Internship

St. Joseph Mercy Hospital

Medical School

University of Michigan

Residency

University of Chicago

Virginia Cancer Specialists office exterior at dusk
Address
8613 Route 29
Fairfax, VA 22031
Hours
Monday through Friday
7:30 a.m. to 5:00 p.m.
Phone
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TESTIMONIAL

“I place a high premium on customer service, and that starts with me. I insist that patients are seen on time, and that wait times for consultations and treatment start times are as short as possible. We are dealing with cancer, after all. At VCS we have the best of both worlds (private practice with close personal attention and also academic with cutting edge research and treatment options).”

Awards

Castle Connolly – 3 Years of Excellence – 2026
Castle Connolly #1 Physician Practice – 2025
Castle Connolly #1 Physician Practice – 2024
Virginia Top Doctor – 2025
Virginia Living Magazine Top Doctors – 2018
Northern Virginia Magazine Top Doctor – 2026
Northern Virginia Magazine Top Doctor – 2025
Northern Virginia Magazine Top Doctor – 2024
Northern Virginia Magazine Top Doctor – 2023
Northern Virginia Magazine Top Doctor – 2020
Northern Virginia Magazine Top Doctor – 2019
Northern Virginia Magazine Top Doctor – 2018
Arlington Magazine Awards Top Doctor – 2025
Arlington Magazine Awards Top Doctor – 2024
Washingtonian Top Doctor – 2025
Washingtonian Top Doctor – 2024
Washingtonian Magazine Top Doctor – 2023
Washingtonian Magazine Top Doctor – 2019
Washingtonian Magazine Top Doctor – 2018

Biography

Dr. Gregory S. Sibley joined Virginia Cancer Specialists after 14 years in Radiation Oncology at Sibley Memorial Hospital in Washington, D.C.  Throughout his career, Dr. Sibley has focused on providing the highest quality care in the field of radiation oncology. He has positioned himself as an expert in the multi-disciplinary treatment of cancer and in state-of-the-art radiation treatment planning techniques. Within the US Oncology Network, Dr. Sibley is a member of the Executive Committee for Radiation Oncology and Vice-Chair for the Technology Committee. Dr. Sibley has authored over 20 peer-reviewed publications, many while on faculty at Duke University Medical Center. Although well-versed in the treatment of multiple cancers, Dr. Sibley has special interest in breast cancer, brachytherapy for prostate cancer, and intensity-modulated radiotherapy for head and neck, and lung cancers.

In his spare time, Dr. Sibley is an avid hockey player and triathlete.

Physician Publications

David Walther

September 27, 2023

Finding the Right Kind of Care I was diagnosed with prostate cancer in April of

Tom N.

November 18, 2024

My name is Tom N.. I am a healthy 64-year-old male who was diagnosed with

A streamlined failure mode and effects analysis

June 1, 2014

Bronchial stenosis: an underreported complication of high-dose external beam radiotherapy for lung cancer?

January 1, 2005

Routine use of approximately 60 Gy once-daily thoracic irradiation for patients with limited-stage small-cell lung cancer

June 1, 2003

73.6 Gy and Beyond: hyperfractionated, accelerated radiotherapy for non-small cell lung cancer

February 1, 2001

What Patients Say

Portrait of Gregory S. Sibley, MD

Locations

8613 Route 29

Fairfax, VA 22031

703.934.5533

Ready to Make an Appointment?

If you have questions about whether this treatment or service may be right for you, make an appointment with the Virginia Cancer Specialists team.