Breast Cancer Treatment (PDQ®)
NCI PDQ® Summaries for Patients
General Information About Breast Cancer
Stages of Breast Cancer
Inflammatory Breast Cancer
Recurrent Breast Cancer
Treatment Option Overview
Treatment Options by Stage
Treatment Options for Inflammatory Breast Cancer
Treatment Options for Recurrent Breast Cancer
To Learn More About Breast Cancer
Get More Information From NCI
Changes to This Summary (09/10/2009)
About PDQ
Breast Cancer Treatment
General Information About Breast Cancer
Breast cancer is a disease in which malignant (cancer) cells
form in the tissues of the breast.
The breast
is made up of lobes
and ducts
. Each breast has 15 to 20 sections called
lobes, which have many smaller sections called lobules
. Lobules end in dozens of tiny bulbs that
can produce milk. The lobes, lobules, and bulbs are linked by thin tubes called
ducts.

Anatomy of the breast, showing lymph nodes and lymph vessels.
Each breast also has blood
vessels
and lymph
vessels
. The lymph vessels carry an almost colorless fluid
called lymph
. Lymph
vessels lead to organs
called lymph
nodes
. Lymph nodes are small bean-shaped structures that are
found throughout the body. They filter substances in a fluid called lymph and help fight
infection
and disease. Clusters of lymph nodes are found near the breast in the
axilla
(under the arm), above the
collarbone, and in the chest.
The most common type of breast cancer
is ductal
carcinoma
, which begins in the cells
of the ducts. Cancer that begins in the
lobes or lobules is called lobular carcinoma
and is more often found in both
breasts than are other types of breast cancer. Inflammatory breast cancer
is an uncommon type of
breast cancer in which the breast is warm, red, and swollen.
See the PDQ
summary on Unusual Cancers of Childhood for information about childhood breast cancer.
Age and health history can affect the risk of developing breast
cancer.
Anything that increases your chance of getting a disease
is called a risk factor
. Having a risk factor does not mean that you will
get cancer
; not having risk factors doesn't mean that you will
not get cancer. People who think they may be at risk should
discuss this with their doctor. Risk factors for breast cancer include the following:
- Older age.
- Menstruating
at an
early age.
- Older age at first birth or never having given birth.
- A personal history of breast cancer or benign
(noncancer) breast disease.
- A mother or sister with breast cancer.
- Treatment with radiation therapy
to the breast/chest.
- Breast tissue
that is dense on a mammogram
.
- Taking hormones
such as estrogen
and progesterone
.
- Drinking alcoholic beverages.
- Being white.
NCI's
Breast Cancer Risk Assessment Tool uses a woman's risk factors to estimate her risk for breast cancer during the next five years and up to age 90. This online tool is meant to be used by a health care provider. For more information on breast cancer risk, see Estimating Breast Cancer Risk: Questions and Answers or call 1-800-4-CANCER.
Breast cancer is sometimes caused by inherited gene mutations
(changes).
The genes
in cells carry
the hereditary
information that is
received from a person’s parents. Hereditary breast cancer makes up
approximately 5% to 10% of all breast cancer. Some altered genes related to
breast cancer are more common in certain ethnic groups.
Women who have an altered gene related to breast cancer and who
have had breast cancer in one breast have an increased risk of developing
breast cancer in the other breast. These women also have an increased risk of
developing ovarian
cancer, and may
have an increased risk of developing other cancers. Men who have an altered
gene related to breast cancer also have an increased risk of developing this
disease. For more information, see the PDQ summary on
Male Breast Cancer Treatment.
Tests have been developed that can detect altered genes. These
genetic tests
are sometimes done for
members of families with a high risk of cancer. See the following PDQ summaries for
more information:
- Breast
Cancer Screening
- Breast Cancer Prevention
- Genetics of Breast and Ovarian Cancer
Tests that examine the breasts are used to detect (find) and
diagnose breast cancer.
A doctor should be seen if changes in the breast are noticed. The
following tests and procedures may be used:
- Mammogram
: An
x-ray
of the breast.

Mammography of the right breast. - Biopsy
: The removal
of cells or tissues so they can be viewed under a microscope by a pathologist
to check for signs of cancer. If a lump in the breast is
found, the doctor may need to remove a small piece of the lump. Four types of
biopsies are as follows:
- Estrogen
and
progesterone receptor test
: A test to measure the amount of estrogen
and progesterone
(hormones) receptors in cancer tissue. If cancer is found in the breast, tissue from the tumor
is checked in the laboratory to find out whether estrogen and progesterone could affect the way cancer grows. The test results show whether hormone therapy
may stop the cancer from growing.
-
MRI
(magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body. This procedure is also called nuclear magnetic resonance imaging (NMRI).
Certain factors affect prognosis (chance of recovery) and treatment options.
The prognosis
(chance of recovery) and treatment options depend on the following:
- The stage
of the cancer (the size of the tumor and whether it is in the breast only or has spread to lymph nodes or other places
in the body).
- The type of breast cancer.
- Estrogen-receptor and progesterone-receptor levels in the tumor tissue.
- Whether the cells have high levels of human epidermal growth factor type 2 receptors
(HER2/neu).
- How fast the tumor is growing.
- A woman’s age,
general health, and menopausal
status (whether a woman
is still having menstrual periods
).
- Whether the cancer has just been diagnosed
or has recurred
(come back).
Stages of Breast Cancer
After breast cancer has been diagnosed, tests are done to find
out if cancer cells have spread within the breast or to other parts of the
body.
The process used to find out whether the cancer
has spread within the breast
or to other
parts of the body is called staging
.
The information gathered from the staging process determines the
stage
of the disease. It is
important to know the stage in order to plan treatment.
There are three ways that cancer spreads in the body.
The three ways that cancer spreads in the body are:
- Through tissue
. Cancer invades
the surrounding normal tissue.
- Through the lymph system
. Cancer invades the lymph system and travels through the lymph vessels
to other places in the body.
- Through the blood
. Cancer invades the veins
and capillaries
and travels through the blood to other places in the body.
When cancer cells
break away from the primary
(original) tumor
and travel through the lymph
or blood to other places in the body, another (secondary) tumor may form. This process is called metastasis
. The secondary (metastatic) tumor is the same type of cancer as the primary tumor. For example, if breast cancer
spreads to the bones, the cancer cells in the bones are actually breast cancer cells. The disease is metastatic breast cancer, not bone cancer
.
The following stages are used for breast cancer:
Stage 0 (carcinoma in situ)
There are 2 types of breast carcinoma in situ
:

Pea, peanut, walnut, and lime show tumor sizes.
Stage I
In stage I
, cancer has formed. The tumor
is 2 centimeters
or smaller and has not spread outside the
breast
.
Stage IIA
In stage IIA
:
- no tumor
is found in the breast
, but cancer
is found in the axillary lymph nodes
(the
lymph nodes
under the arm);
or
- the tumor is 2 centimeters
or smaller and has spread
to the axillary lymph nodes;
or
- the tumor is larger than 2 centimeters but not larger than 5 centimeters and has not
spread to the axillary lymph nodes.
Stage IIB
In stage IIB
, the tumor
is either:
- larger than 2 centimeters
but not larger than 5 centimeters and has spread
to the axillary lymph nodes
; or
- larger than 5 centimeters but has not
spread to the axillary lymph nodes.
Stage IIIA
In stage IIIA
:
- no tumor
is found in the breast
. Cancer
is found in axillary lymph nodes
that are attached to each other or to other structures, or cancer may be found in lymph nodes near the breastbone; or
- the tumor is 2 centimeters
or smaller. Cancer has spread
to axillary lymph nodes that are attached to each other or to other structures, or cancer may have spread to lymph nodes near the breastbone; or
- the tumor is larger than 2 centimeters but not larger than 5 centimeters. Cancer has spread to axillary lymph nodes that are attached to each other or to other structures, or cancer may have spread to lymph nodes near the breastbone; or
- the tumor is larger than 5 centimeters. Cancer has spread to axillary
lymph nodes that may be attached to each other or to other
structures, or cancer may have spread to lymph nodes near the breastbone.
Stage IIIB
In stage IIIB
, the
tumor
may be any size and cancer
:
- has spread to the chest wall
and/or the skin of the breast
; and
- may have spread to axillary lymph nodes
that may be attached to each other or to other structures, or cancer may have spread to lymph nodes near the breastbone.
Cancer that has spread to the skin of the breast is inflammatory breast cancer
. See the section on Inflammatory Breast Cancer for more information.
Stage IIIC
In stage IIIC
, there may be no sign of cancer
in the breast
or the tumor
may be any size and may have spread to the chest wall
and/or the skin of the breast. Also, cancer:
Cancer that has spread to the skin of the breast is inflammatory breast cancer
. See the section on Inflammatory Breast Cancer for more information.
Stage IIIC breast cancer
is divided into operable
and inoperable
stage IIIC.
In operable stage IIIC, the cancer:
- is found in ten or more axillary lymph nodes
; or
- is found in lymph nodes below the collarbone; or
- is found in axillary lymph nodes and in lymph nodes near the breastbone.
In inoperable stage IIIC breast cancer, the cancer has spread to the lymph nodes above the collarbone.
Stage IV
In stage IV
, the cancer
has spread to other organs
of the body, most often the bones,
lungs
, liver
, or brain.
Inflammatory Breast Cancer
In inflammatory breast
cancer
, cancer
has spread to the skin of the breast and the breast
looks red and swollen and feels warm. The
redness and warmth occur because the cancer
cells
block the lymph vessels
in the skin. The skin of the breast
may also show the pitted appearance called peau
d’orange
(like the skin of an orange). There may not be any lumps in the breast that can be felt. Inflammatory breast cancer may be stage IIIB
, stage IIIC
, or stage IV
.

Inflammatory breast cancer of the left breast showing peau d’orange and inverted nipple.
Recurrent Breast Cancer
Recurrent
breast
cancer
is cancer
that has recurred
(come back) after it has been treated. The cancer may come back in
the breast, in the chest wall
, or
in other parts of the body.
Treatment Option Overview
There are different types of treatment for patients with breast
cancer.
Different types of treatment are available for patients with breast
cancer
. Some treatments are standard
(the currently used treatment), and some are being tested in
clinical trials
. A
treatment clinical trial is a research study meant to help improve current
treatments or obtain information on new treatments for patients with cancer
.
When clinical trials show that a new treatment is better than the
standard treatment, the new
treatment may become the standard treatment. Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment.
Five types of standard treatment are used:
Surgery
Most patients with breast cancer have surgery
to remove the cancer from the breast. Some
of the lymph nodes
under the arm
are usually taken out and looked at under a microscope to see if they contain
cancer cells
.
Breast-conserving
surgery
, an operation to remove the cancer but not the breast
itself, includes the following:

Breast-conserving surgery. Dotted lines show the area containing the tumor that is removed and some of the lymph nodes that may be removed.
Patients who are treated with breast-conserving surgery may also have some of the lymph nodes under the arm removed for biopsy
. This procedure is called lymph node dissection
. It may be done at the same time as the breast-conserving surgery or after. Lymph node dissection is done through a separate incision
.
Other types of surgery include the following:
- Total mastectomy
: Surgery to remove the whole breast that has cancer. This procedure is also called a simple mastectomy. Some of the lymph nodes under the arm may be removed for biopsy at the same time as the breast surgery or after. This is done through a separate incision.

Total (simple) mastectomy. The dotted line shows where the entire breast is removed. Some lymph nodes under the arm may also be removed. - Modified radical
mastectomy
: Surgery to remove the whole breast that has cancer, many of the lymph nodes under
the arm, the lining over the chest muscles, and sometimes, part of the
chest wall
muscles.

Modified radical mastectomy. The dotted line shows where the entire breast and some lymph nodes are removed. Part of the chest wall muscle may also be removed. - Radical
mastectomy
: Surgery to remove the breast that has cancer, chest wall muscles under the breast, and all of the lymph nodes under the arm. This procedure is sometimes called a Halsted radical mastectomy.
Even if the doctor removes all the cancer that can be seen at
the time of the surgery, some patients may be given radiation therapy
,
chemotherapy
, or
hormone therapy
after surgery to kill any cancer cells that are left. Treatment given after the surgery, to
lower the risk that the cancer will come back, is called adjuvant
therapy
.
If a patient is going to have a mastectomy,
breast reconstruction
(surgery to
rebuild a breast’s shape after a mastectomy) may be considered. Breast
reconstruction may be done at the time of the mastectomy or at a future time.
The reconstructed breast may be made with the patient’s own (nonbreast) tissue
or by using implants
filled with saline
or silicone gel
. Before the decision to get an implant is
made, patients can call the Food and Drug Administration's (FDA) Center for Devices and Radiologic Health at
1-888-INFO-FDA (1-888-463-6332) or visit the FDA's Web site for more information on breast implants.
Radiation therapy
Radiation therapy is a cancer treatment that uses high-energy x-rays
or other types of radiation
to kill cancer cells or keep them from growing. There are two types of radiation therapy. External radiation
therapy uses a machine outside the body to send radiation toward the cancer. Internal radiation
therapy uses a radioactive
substance sealed in needles, seeds
, wires, or catheters
that are placed directly into or near the cancer. The way the radiation therapy is given depends on the type and stage
of the cancer being treated.
Chemotherapy
Chemotherapy is a cancer treatment that uses drugs
to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. When chemotherapy is taken by mouth or injected
into a vein
or muscle, the drugs enter the bloodstream and can reach cancer cells throughout the body (systemic chemotherapy
). When chemotherapy is placed directly into the spinal column
, an organ
, or a body cavity
such as the abdomen
, the drugs mainly affect cancer cells in those areas (regional chemotherapy
). The way the chemotherapy is given depends on the type and stage of the cancer being treated.
Hormone therapy
Hormone therapy
is a cancer treatment that removes hormones
or blocks their action and stops cancer cells from growing. Hormones are substances produced by glands
in the body and circulated in the bloodstream. Some hormones can cause certain cancers to grow. If tests show that the cancer cells have places where hormones can attach (receptors
), drugs, surgery, or radiation therapy is used to reduce the production of hormones or block them from working. The hormone estrogen
, which makes some breast cancers grow, is made mainly by the ovaries
. Treatment to stop the ovaries from making estrogen is called ovarian ablation
.
Hormone therapy with tamoxifen
is often given to patients with early
stages of breast cancer and those
with metastatic
breast cancer (cancer
that has spread to other parts of the body). Hormone therapy with tamoxifen or
estrogens can act on cells all over the body and may increase the chance of
developing endometrial
cancer.
Women taking tamoxifen should have a pelvic
exam every year to look for any
signs of cancer. Any vaginal
bleeding, other than menstrual
bleeding, should be reported to a doctor as soon as possible.
Hormone therapy with an aromatase inhibitor
is given to some postmenopausal
women who have hormone-dependent breast cancer. Hormone-dependent breast cancer needs the hormone estrogen
to grow. Aromatase inhibitors decrease the body's estrogen by blocking an enzyme
called aromatase from turning androgen
into estrogen.
For the treatment of early stage breast cancer, certain aromatase inhibitors may be used as adjuvant therapy instead of tamoxifen or after 2 or more years of tamoxifen. For the treatment of metastatic
breast cancer, aromatase inhibitors are being tested in clinical trials to compare them to hormone therapy with tamoxifen.
Targeted therapy
Targeted therapy
is a type of treatment that uses drugs or other substances to identify and attack specific cancer cells without harming normal cells. Monoclonal antibodies
and tyrosine kinase inhibitors
are two types of targeted therapies being studied in the treatment of breast cancer.
Monoclonal antibody therapy
is a cancer treatment that uses antibodies
made in the laboratory, from a single type of immune system
cell. These antibodies can identify substances on cancer cells or normal substances that may help cancer cells grow. The antibodies attach to the substances and kill the cancer cells, block their growth, or keep them from spreading. Monoclonal antibodies are given by infusion
. They may be used alone or to carry drugs, toxins
, or radioactive material directly to cancer cells. Monoclonal antibodies may be used in combination with chemotherapy as adjuvant therapy.
Trastuzumab
(Herceptin) is a monoclonal antibody that blocks the effects of the growth factor
protein
HER2
, which sends growth signals to breast cancer cells. About one-fourth of patients with breast cancer have tumors that may be treated with trastuzumab combined with chemotherapy.
Tyrosine kinase inhibitors are targeted therapy drugs that block signals needed for tumors to grow. Tyrosine kinase inhibitors may be used in combination with other anticancer drugs as adjuvant therapy.
Lapatinib
is a tyrosine kinase inhibitor that blocks the effects of the HER2 protein and other proteins inside tumor cells. It may be used to treat patients with HER2-positive breast cancer that has progressed
following treatment with trastuzumab.
New types of treatment are being tested in clinical trials.
This summary section describes treatments that are being studied in
clinical trials. It may not mention every new treatment being studied.
Information about clinical trials is available from the
NCI Web site.
Sentinel lymph node biopsy followed by surgery
Sentinel lymph node biopsy
is the removal of the sentinel lymph node
during surgery. The sentinel lymph node is the first lymph node to receive lymphatic drainage from a tumor. It is the first lymph node the cancer is likely to spread to from the tumor. A radioactive substance and/or blue dye is injected near the tumor. The substance or dye flows through the lymph ducts
to the lymph nodes. The first lymph node to receive the substance or dye is removed. A pathologist
views the tissue under a microscope to look for cancer cells. If cancer cells are not found, it may not be necessary to remove more lymph nodes. After the sentinel lymph node biopsy, the
surgeon
removes the tumor (breast-conserving surgery or mastectomy).



Sentinel lymph node biopsy. Radioactive substance and/or blue dye is injected near the tumor (first panel), the injected material is followed visually or with a probe (middle panel), and the first lymph nodes to take up the material are removed and checked for cancer cells (last panel).
High-dose chemotherapy with stem cell transplant
High-dose chemotherapy
with stem cell transplant
is a way of giving high doses
of chemotherapy and replacing blood
-forming cells destroyed by the cancer treatment. Stem cells
(immature blood cells) are removed from the blood or bone marrow
of the patient or a donor and are frozen and stored. After the chemotherapy is completed, the stored stem cells are thawed and given back to the patient through an infusion. These reinfused stem cells grow into (and restore) the body’s blood cells.
Studies have shown that high-dose chemotherapy followed by stem cell transplant does not work better than standard chemotherapy in the treatment of breast
cancer. Doctors have decided that, for now, high-dose chemotherapy should be tested only in clinical trials. Before taking part in such a trial, women should
talk with their doctors about the serious side
effects, including death, that may be caused by high-dose chemotherapy.
Patients may want to think about taking part in a clinical trial.
For some patients, taking part in a clinical trial
may be the best treatment choice. Clinical trials are part of the cancer research process. Clinical trials are done to find out if new cancer treatments are safe and effective or better than the standard treatment.
Many of today's standard treatments for cancer are based on earlier clinical trials. Patients who take part in a clinical trial may receive the standard treatment or be among the first to receive a new treatment.
Patients who take part in clinical trials also help improve the way cancer will be treated in the future. Even when clinical trials do not lead to effective new treatments, they often answer important questions and help move research forward.
Patients can enter clinical trials before, during, or after starting their cancer treatment.
Some clinical trials only include patients who have not yet received treatment. Other trials test treatments for patients whose cancer has not gotten better. There are also clinical trials that test new ways to stop cancer from recurring
(coming back) or reduce the side effects
of cancer treatment.
Clinical trials are taking place in many parts of the country. See the Treatment Options section that follows for links to current treatment clinical trials. These have been retrieved from NCI's
clinical trials database.
Follow-up tests may be needed.
Some of the tests that were done to diagnose
the cancer or to find out the stage
of the cancer may be repeated. Some tests will be repeated in order to see how well the treatment is working. Decisions about whether to continue, change, or stop treatment may be based on the results of these tests. This is sometimes called re-staging.
Some of the tests will continue to be done from time to time after treatment has ended. The results of these tests can show if your condition has changed or if the cancer has recurred
(come back). These tests are sometimes called follow-up
tests or check-ups.
Treatment Options by Stage
A link to a list of current clinical trials
is included for each treatment section. For some types or stages
of cancer, there may not be any trials listed. Check with your doctor for clinical trials that are not listed here but may be right for you.
Ductal Carcinoma In Situ (DCIS)
Treatment of ductal carcinoma in situ
(DCIS) may include the following:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with ductal breast carcinoma in situ. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Lobular Carcinoma In Situ (LCIS)
Treatment of lobular carcinoma in situ
(LCIS) may include the following:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with lobular breast carcinoma in situ. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Stage I, Stage II, Stage IIIA, and Operable Stage IIIC Breast Cancer
Treatment of stage I
,
stage II
, stage IIIA
, and operable
stage IIIC breast cancer
may include the following:
Adjuvant
therapy
(treatment given after surgery to
increase the chances of a cure
) may include the following:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with stage I breast cancer, stage II breast cancer, stage IIIA breast cancer and stage IIIC breast cancer. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Stage IIIB, Inoperable Stage IIIC, Stage IV, and Metastatic Breast CancerStage IIIB and inoperable stage IIIC breast cancer
Treatment of stage IIIB
and inoperable
stage IIIC breast cancer
may include the following:
Stage IV and metastatic breast cancer
Treatment of stage IV
or
metastatic
breast cancer
may include
the following:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with stage IIIB breast cancer, stage IIIC breast cancer and stage IV breast cancer. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Treatment Options for Inflammatory Breast Cancer
Treatment of inflammatory breast
cancer
may include the following:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with inflammatory breast cancer. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Treatment Options for Recurrent Breast Cancer
Treatment of recurrent
breast cancer
(cancer
that has come
back after treatment) in the breast or chest
wall
may include the following:
Check for U.S. clinical trials from NCI's PDQ Cancer Clinical Trials Registry that are now accepting patients with recurrent breast cancer. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
To Learn More About Breast Cancer
For more information from the National Cancer Institute
about breast cancer, see the following:
For general cancer
information and other resources from the National Cancer Institute, see the following:
Get More Information From NCI
Call 1-800-4-CANCER
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Search the NCI Web site
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There are also many other places to get materials and information about cancer treatment and services. Hospitals in your area may have information about local and regional agencies that have information on finances, getting to and from treatment, receiving care at home, and dealing with problems related to cancer treatment.
Find Publications
The NCI has booklets and other materials for patients, health professionals, and the public. These publications discuss types of cancer, methods of cancer treatment, coping with cancer, and clinical trials. Some publications provide information on tests for cancer, cancer causes and prevention, cancer statistics, and NCI research activities. NCI materials on these and other topics may be ordered online or printed directly from the NCI Publications Locator. These materials can also be ordered by telephone from the Cancer Information Service toll-free at 1-800-4-CANCER (1-800-422-6237).
Changes to This Summary (09/10/2009)
The PDQ
cancer
information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.
Editorial changes were made to this summary.
About PDQ
PDQ is a comprehensive cancer database available on NCI's Web site.
PDQ is the National Cancer Institute's (NCI's) comprehensive cancer information database. Most of the information contained in PDQ is available online at NCI's Web site. PDQ is provided as a service of the NCI. The NCI is part of the National Institutes of Health, the federal government's focal point for biomedical research.
PDQ contains cancer information summaries.
The PDQ database contains summaries of the latest published information on cancer prevention, detection, genetics, treatment, supportive care, and complementary and alternative medicine. Most summaries are available in two versions. The health professional versions provide detailed information written in technical language. The patient versions are written in easy-to-understand, nontechnical language. Both versions provide current and accurate cancer information.
The PDQ cancer information summaries are developed by cancer experts and reviewed regularly.
Editorial Boards made up of experts in oncology and related specialties are responsible for writing and maintaining the cancer information summaries. The summaries are reviewed regularly and changes are made as new information becomes available. The date on each summary ("Date Last Modified") indicates the time of the most recent change.
PDQ also contains information on clinical trials.
A clinical trial is a study to answer a scientific question, such as whether one treatment is better than another. Trials are based on past studies and what has been learned in the laboratory. Each trial answers certain scientific questions in order to find new and better ways to help cancer patients. During treatment clinical trials, information is collected about the effects of a new treatment and how well it works. If a clinical trial shows that a new treatment is better than one currently being used, the new treatment may become "standard." Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment.
Listings of clinical trials are included in PDQ and are available online at NCI's Web site. Descriptions of the trials are available in health professional and patient versions. Many cancer doctors who take part in clinical trials are also listed in PDQ. For more information, call the Cancer Information Service 1-800-4-CANCER (1-800-422-6237).
Date last modified: 2009-09-10