Frequently asked questions about proton therapy

Proton therapy machine ProBeam 360
Question What is proton therapy?
Proton therapy is a cutting-edge form of radiation treatment that uses protons, or positively charged particles found within atoms, instead of X-rays to kill cancer cells.
Question How does proton therapy work?

From outside the body, a machine called a cyclotron delivers a high-energy proton beam painlessly through the skin to the tumor.

Question What are the advantages of proton therapy for cancer?

Proton therapy precisely targets tumor cells, limiting radiation exposure and consequent damage to healthy surrounding tissue and organs, and reducing the chance of short- and long-term side effects that could impact quality of life compared to conventional radiation. Because proton therapy results in fewer complications and side effects, clinicians can sometimes deliver higher doses of radiation to tumors, enhancing curative potential.

Question What types of cancer can be treated by proton therapy?

Proton therapy can be used alone or with therapies such as surgery and chemotherapy to treat many types of localized cancer (cancer that hasn’t spread). These include prostate, brain, breast, head-and-neck, lung, liver, pancreatic, spine and gastrointestinal cancers in adults, and brain cancer, lymphoma, retinoblastoma and sarcoma in children.

Read more about Chakravarti’s work with proton therapy

Question What is the success rate of proton therapy?

According to the National Association for Proton Therapy (NAPT), multiple studies have demonstrated that patients treated with proton therapy experience improved survival rates when compared to patients treated with other radiation treatment modalities. Proton therapy also significantly reduces a patient’s chances of later developing a secondary cancer due to radiation treatment.

Question Are there any side effects of proton therapy?

Although proton therapy reduces side effects by more precisely directing the radiation beam to the tumor and sparing surrounding tissue and organs, there still may be some side effects, albeit generally less than with conventional radiation.

Question What is FLASH treatment?

FLASH is an even newer and more highly targeted form of proton therapy that is being studied in preclinical models and is not yet approved by the U.S. Food and Drug Administration. Preclinical data have demonstrated that FLASH therapy could reduce a typical weeks-long treatment regimen to a single treatment delivered in less than a second. The Ohio State University’s forthcoming proton therapy center is being built with a dual-capability system that can deliver both conventional proton therapy and FLASH therapy, which will be investigated at the center in clinical trial participants with certain newly diagnosed, recurrent or advanced cancers.

Image courtesy of Varian Medical Systems, Inc. All rights reserved.

At The James, there is no routine cancer

Our experts develop and deliver the most advanced targeted treatments leading to better outcomes and more hope.

Learn More


Related websites

Subscribe. The latest from Ohio State Health & Discovery delivered right to your inbox.


Get articles and stories about health, wellness, medicine, science and education delivered right to your inbox from the experts at Ohio State.

Required fields

By clicking "Subscribe" you agree to our Terms of Use.
Learn more about how we use your information by reading our Privacy Policy.