NCCN Guidelines for Patients® | Stages I and II Breast Cancer - page 52

NCCN Guidelines for Patients
®
Stages I and II Breast Cancer, Version 1.2014
1
Breast cancer
basics
6
Risk factors for mesothelioma
7
Webpages | Review
50
Radiation therapy is a local treatment
that uses high-energy rays to treat
cancer. The rays damage the genes
in cells. The damage either kills the
cancer cells or stops new cancer cells
from being made. Part 5 discusses how
radiation therapy is given and to whom.
External radiation therapy
The most common method
Radiation therapy is given after chemotherapy is
finished. It is okay to take trastuzumab during radiation
therapy. If you didn’t have chemotherapy, radiation
therapy follows surgery. If you are pregnant, you may
have radiation after your baby is born.
The most common type of radiation therapy used
for breast cancer is EBRT (
e
xternal
b
eam
r
adiation
t
herapy). This type of therapy uses a machine outside
the body to deliver radiation. Radiation beams are
aimed at the tumor with help from ink marks or tiny
tattoos on the skin.
Before EBRT, pictures (images) of the breast region
should be taken with a CT scan. See page 13 for
information on CT scans. Imaging the region and
designing the radiation treatment before EBRT is
called simulation. Your doctors will use the images to
decide the radiation dose and to shape the radiation
5
Radia ion th apy
50 External radiation therapy
52 Should I have radiation therapy?
55 Side effects of radiation
56 Review
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