21st Century Oncology is Nevada's premier radiation oncology provider. Our team of physicians and staff takes great pride in offering the most compassionate, highest quality and advanced care available.

Radiation Oncologists

Samuel P. Au, M.D., Ph.D.
Mallinckrodt Institute, Washington University, St. Louis

Brian D. Lawenda, M.D.
Massachusetts General Hospital, Dana Farber Cancer Institute, Harvard Medical School

Tam T. Nguyen, M.D.
University of Arizona

Susan A. Reisinger, M.D.
Memorial Sloan-Kettering Cancer Center

Paul K. Treadwell, M.D.
University of California, Irvine

Why you should choose 21st Century Oncology as your radiation oncology provider:

21st Century Oncology is the premier radiation oncology provider of Southern Nevada, caring for more patients than any other practice in Las Vegas.
21st Century Oncology is the largest radiation oncology provider in the United States, enabling us to bring the latest advances in technology to our patients at the highest quality and lowest cost.
21st Century Oncology is the only radiation oncology provider to use "Gamma Function", a proprietary technology developed to ensure that each and every treatment is delivered safely, precisely and accurately.
Our expert team of physicians is recognized as the community leaders in the treatment of a wide-range of benign and malignant tumors.
To ensure that the highest quality of care is delivered to our patients, nationally recognized experts continuously assess, provide feedback and mentor each member of our patient care team.
All of our radiation treatment facilities are accredited by the American College of Radiation Oncology.

RapidArc-Varian Rapid Arc Prostate Cancer

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21st Century Oncology offers our patients the latest advance in precision radiation therapy:
Rapid Arc



21st Century Oncology is the most experience team in Southern Nevada in the use of Rapid Arc (by Varian).

Rapid Arc enables higher doses to be delivered more safely and quickly than any other modality.

A Rapid Arc treatment can be completed in as little as 3-minutes (compared with 15-45 minutes for other treatment technologies).

Read a testimonial about Rapid Arc from one of our patients in the Las Vegas Sun:


Rapid Arc in Las Vegas 21st Century Oncology

21st Century Oncology offers Integrative Oncology counseling and education to our patients

As a component of our overall care, our patients have access to Integrative Oncology counseling and education by Dr. Brian Lawenda, the only Harvard-trained radiation oncologist in Nevada and founding member of the Society for Integrative Oncology. As a Stanford/UCLA-trained medical acupuncturist and board member of Pacific College of Oriental Medicine and the Society for Integrative Oncology, Dr. Lawenda has a broad understanding of the value of combining evidence-based complementary and conventional therapies in cancer care.

If you are interested in learning more about how integrative oncology can help you better manage side effects or symptoms of your cancer or treatment, call us to schedule an appointment: (702) 990-4767
Dr Brian Lawenda discusses the "anti-cancer" lifestyle and diet on UNLV TV's "Cancer News Today" (segment starts at 19:41)

21st Century Oncology offers the most advanced Stereotactic Radiation Therapy and Image-Guided Radiation Therapy technologies

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We have treated more intracranial and extracranial tumors with these technologies than any other radiation oncology practice in our community.


Learn more about our Image-Guided Radiation Therapy and Stereotactic Radiation Therapy technologies, including Calypso "GPS for the body".

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