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Radiation therapy
Source: Liver Cancer Treatment, National Cancer Institute.
Source updated: May 8, 2025 · Captured 2026-09-09.
Selected source text with whitespace normalised. This Triangle page is not an NCI PDQ summary. Independent clinical review is pending.
Context: Types of treatment
External radiation therapy uses a machine outside the body to send high-energy x-rays or other types of radiation toward the area of the body with cancer. Radiation is given in a series of treatments to allow healthy cells to recover and to make radiation more effective. The number of treatments is based on details about the cancer, such as the size and location of the tumor. Certain ways of giving external radiation therapy can help keep radiation from damaging nearby healthy tissue:
Conformal radiation therapy: Conformal radiation therapy uses a computer to make a 3-dimensional, or 3-D, picture of the tumor and shapes the radiation beams to fit the tumor. This allows a high dose of radiation to reach the tumor and causes less damage to nearby healthy tissue.
Stereotactic body radiation therapy: Stereotactic body radiation therapy uses special equipment to place the person in the same position for each radiation treatment. Once a day for several days, a radiation machine aims a larger than usual dose of radiation directly at the tumor. By having the person in the same position for each treatment, there is less damage to nearby healthy tissue. This procedure is also called stereotactic external beam radiation therapy and stereotaxic radiation therapy.
Proton beam radiation therapy: Proton beam radiation therapy is a type of high-energy, external radiation therapy that uses streams of protons (tiny particles with a positive charge) to kill tumor cells. This type of treatment can lower the amount of radiation damage to healthy tissue near a tumor.
Learn more about radiation therapy and its side effects at Radiation Therapy to Treat Cancer and Radiation Therapy Side Effects.
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Preserved source evidence · Independent clinical review pending · Not medical advice