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NCCN Guidelines for Patients


Stomach Cancer, Version 1.2016


Overview of cancer treatments Radiation therapy

Radiation therapy

Radiation therapy uses high-energy rays to treat

cancer. The rays damage DNA. This either kills the

cancer cells or stops new cancer cells from being

made. For stomach cancer, radiation therapy is

often given with chemotherapy. Chemotherapy may

improve how well radiation works. This combined

treatment is called chemoradiation.









herapy) is the

method used to treat stomach cancer. This method

delivers radiation from outside your body using a

large machine.

See Figure 12

. The radiation passes

through your skin and other tissue to reach the tumor.

Simulation session

To receive radiation therapy, you first must have a

planning (simulation) session. Do not eat a heavy

meal 3 hours beforehand. A 3D image of the tumor

will be made with a CT scan. Contrast may be used to

enhance images.

Images are taken after your body is moved into the

position needed for treatment. It is advised that you

lie on your back and be kept from moving with an

immobilization device. For some people, 4D-CT

planning and other methods to control movement may

be used.

Using the scans, your treatment team will plan the

best radiation dose, number and shape of radiation

beams, and number of treatment sessions. Beams

are shaped with computer software and hardware that

Figure 12.

External beam

radiation therapy

Radiation therapy is often delivered

from a large machine. The rays

pass through skin and travel

to the tumor. Healthy tissue is

protected by using modern types of