RADIATION
THERAPY FOR GYNECOLOGIC CANCERS UNDERSTANDING YOUR TREATMENT
OPTIONS
Facts about Gynecologic Cancer Gynecologic
cancers include cancer of the uterus, ovaries, cervix, vagina, vulva and Fallopian
tubes. According to the American Cancer Society, nearly
83,000 women per year are diagnosed with some form of gynecologic or GYN cancer. The
most common gynecologic cancer is uterine cancer with more than 40,000 cases diagnosed
each year. Every year, more than 28,000 women die from a
type of gynecologic cancer. Widespread screening with the
Pap test has allowed doctors to find pre-cancerous changes in the cervix and vagina.
This has helped prevent the development of some invasive cancers.
Risk Factors for Gynecologic Cancer While all women are
at risk for gynecologic cancer, some factors can increase a woman's chances of
developing the disease. -
Uterine cancer:
Never pregnant, beginning menstruation early, late menopause, diabetes, use of
estrogen alone (called unopposed estrogen) for hormone replacement therapy, family
history of uterine cancer, high blood pressure and complex atypical hyperplasia.
Tamoxifen, a drug frequently used to treat breast cancer, increases the risk of
uterine cancer slightly. A genetic syndrome called hereditary nonpolyposis colon
cancer (HNPCC) may also increase a woman's risk. -
Cervical
cancer: Strongly associated with sexually transmitted diseases, especially
several strains of human papilloma virus (HPV), sexual activity at an early age,
multiple sexual partners, smoking and obesity. -
Ovarian
cancer: Obesity, never pregnant, unopposed estrogen, personal or family
history of breast or ovarian cancer, genetic mutations in the BRCA1 or BRCA2 gene,
HNPCC. -
Vaginal cancer: History of
genital warts or an abnormal Pap test. There is an increased risk of clear cell
carcinoma in women whose mothers took the drug diethylstilbestrol (DES) while
pregnant. Women previously treated for carcinoma in-situ or invasive cervical
cancer also have a higher risk of developing vaginal cancer.
Signs and Symptoms of Gynecologic Cancer There are often
no outward signs of gynecologic cancers. However, some common symptoms include:
-
Unusual bleeding, such as postmenopausal bleeding, bleeding
after intercourse or bleeding between periods. -
A sore
in the genital area that doesn't heal or chronic itching of the vulva. -
Pain or pressure in the pelvis. -
Persistent
vaginal discharge. Screening for Gynecologic
Cancer Gynecologic cancers are often detected through a series of
screening exams. -
Your doctor will first perform
a pelvic exam to evaluate your vulva, vagina, cervix, uterus, Fallopian tubes,
ovaries and rectum. -
During the pelvic exam, your doctor
will gently scrape some cells from the cervix and vagina to examine under a microscope.
This is called a Pap test. -
If the Pap test is abnormal,
your doctor may perform a test called a colposcopy to closely examine the cervix.
Scraping cells from the cervical canal (endocervical curettage) may also be necessary. -
A small sample of tissue may be taken from any suspicious area.
This test is called a biopsy. -
Occasionally, doctors
need to examine a larger sample of cervical tissue. It is obtained during a procedure
called conization or cone biopsy. -
In some situations,
your doctor may recommend an exam under anesthesia to better evaluate the extent
of a cancer. Tests requiring anesthesia include examination of the bladder (cystoscopy)
and rectum (sigmoidoscopy). -
Abnormal uterine bleeding,
a common symptom of uterine cancer, is usually evaluated by performing a dilatation
and curettage, also called a D and C. -
Your doctor may
also ask for MRI, CT, PET or ultrasound scans of the abdomen and pelvis to better
evaluate areas that cannot be directly viewed, such as the ovaries.
Treatment Options for Gynecologic Cancer Treatment for
gynecologic cancer depends on several factors, including the type of cancer, its
extent (stage), its location and your overall health. It is important to talk
with several cancer specialists before deciding on the best treatment for you,
your cancer and your lifestyle. -
A gynecologic
oncologist is a doctor who specializes in surgically removing gynecologic cancers. -
A radiation oncologist is a doctor specially trained to treat
cancer with radiation therapy. -
A medical oncologist
is a doctor who specializes in treating cancer with drugs (chemotherapy).
Sometimes, your cancer may be cured by using only one type of treatment. In
other cases, your cancer may be best cured using a combination of surgery, radiation
therapy and chemotherapy. Understanding Radiation Therapy Radiation
therapy, sometimes called radiotherapy, is the careful use of radiation to safely
and effectively treat cancer. -
Radiation oncologists
use radiation therapy to try to cure cancer, to control cancer growth or to relieve
symptoms, such as pain. -
Radiation therapy works within
cancer cells by damaging their ability to multiply. When these cells die, the
body naturally eliminates them. -
Healthy tissues are
also affected by radiation, but they are able to repair themselves in a way cancer
cells cannot. External Beam Radiation
Therapy External beam radiation therapy involves a series of daily
outpatient treatments to accurately deliver radiation to the cancer. Each treatment
is painless and is similar to getting an X-ray. They are often given in a series
of daily sessions, each taking less than half an hour, Monday through Friday,
for five to six weeks. In some cases, you may receive more than one treatment
in a day, often several hours apart. -
3-dimensional
conformal radiotherapy, or 3D-CRT, combines multiple radiation treatment fields
to deliver precise doses of radiation to the affected area. Tailoring each of
the radiation beams to focus on the tumor delivers a high dose of radiation to
the tumor and avoids nearby healthy tissue. -
Intensity
modulated radiation therapy, or IMRT, is the most recent advance in the delivery
of radiation. IMRT improves on 3D-CRT by modifying the intensity of the radiation
within each of the radiation beams. This allows more precise adjustment of radiation
doses to the tissues within the target area.
Brachytherapy Brachytherapy (also called internal or intracavitary
radiotherapy) involves placing radioactive sources in or next to the cancer. This
is usually done at the same time or after external beam radiation therapy. Brachytherapy
is very important in the treatment of vaginal, cervical and uterine cancers. There
are two main types of brachytherapy: -
Low-dose
rate brachytherapy is delivered over the course of 48 to 72 hours. You will be
admitted into the hospital to receive this treatment. -
High-dose
rate brachytherapy is given over the course of several minutes, but the entire
procedure typically takes a few hours. You may be able to go home immediately
after this treatment. Depending of the type
of cancer you have, you may need to have several sessions of brachytherapy to
cure your cancer. Potential Side Effects The side effects
you may experience will depend on the area being treated, the type of radiation
used and whether or not you also received chemotherapy. Before treatment, your
doctor will describe what you can expect. -
Some
patients experience minor or no side effects and can continue their normal routines. -
Some patients may notice fatigue, skin irritation, vaginal irritation,
frequent urination, burning with urination and/or diarrhea. These will all resolve
after treatment ends. -
Some patients will have sexual
changes, such as changes in the vagina. -
If at any time
you develop side effects, tell your doctor or nurse. He or she can give you medicine
to help. Helpful Web Sites On Gynecologic
Cancer American Cancer Society http://www.cancer.org/ National
Cancer Institute http://www.cancer.gov/ National
Cervical Cancer Coalition http://www.nccc-online.org/ Women's
Cancer Network http://www.wcn.org/ Learning
About Clinical Trials The radiation oncology team is constantly exploring
new ways to treat gynecologic cancers through studies called clinical trials.
Today's standard radiation therapy treatments are a result of clinical trials
completed many years ago. For more information, please contact the following organizations: National
Cancer Institute www.cancer.gov/clinicaltrials Radiation
Therapy Oncology Group http://www.rtog.org/ About
the Radiation Oncology Team Radiation oncologists are the doctors
who oversee the care of each person undergoing radiation treatment. Other members
of the radiation oncology team include radiation therapists, radiation oncology
nurses, medical physicists, dosimetrists, social workers and nutritionists. To
locate a radiation oncologist in your area, visit
www.astro.org/patient. About ASTRO The American
Society for Therapeutic Radiology and Oncology is the largest radiation oncology
society in the world. ASTRO's mission is to advance the practice of radiation
oncology by promoting excellence in patient care, promoting research and disseminating
research results. |