NCCN Guidelines for Patients
Stomach Cancer, Version 1.2016
Overview of cancer treatments Radiation therapy
are added to the radiation machine. Radiation beams
are aimed at the tumor with help from ink marks on
the skin or marker seeds in the tumor.
Do not eat a heavy meal 3 hours before treatment.
During treatment, you will lie on a table in the same
position as done for simulation. Devices may be used
to keep you from moving so that the radiation targets
You will be alone while the technician operates the
machine from a nearby room. He or she will be able
to see, hear, and speak with you at all times. As
treatment is given, you may hear noises. One session
can take less than 10 minutes.
There are multiple types of EBRT. For stomach
cancer, 3D-CRT (
herapy) is strongly advised. In 3D-CRT, the
radiation beams match the shape of your tumor to
avoid healthy tissues.
Sometimes vital organs may be within the field of
the radiation beam if 3D-CRT is used. Vital organs
include the heart, lungs, liver, and kidneys. In these
cases, IMRT (
may be used. IMRT is a more precise type of 3D-CRT
that may be used to avoid giving radiation to vital
organs. The radiation beam is divided into smaller
beams, and the strength of each beam can vary.
Side effects of radiation
Radiation therapy is likely to cause changes in your
skin. Skin that was exposed to radiation will look and
feel as if it has been sunburned. It will likely become
red and may also become dry, sore, and feel painful
Radiation therapy to a stomach tumor may also cause
GI symptoms. You may feel nauseated, vomit, and
have diarrhea. You may have pain in the area. Other
reactions may include extreme tiredness despite
sleep (fatigue) and loss of appetite.
Not all side effects of radiation therapy are listed here.
Please ask your treatment team for a complete list of
common and rare side effects. If a side effect bothers
you, tell your treatment team. There may be ways to
help you feel better.