Uterine cancer is cancer of the uterus, which is affixed at the top of
the vagina and is the organ that holds a baby during pregnancy and also
bleeds each month when not pregnant. There are different types of
uterine cancer, one of which is also referred to as endometrial cancer.
The types of uterine cancer are smooth muscle cancers called
leiomyosarcomas (there can also be a benign tumor of the smooth muscle
called a myoma or fibroid), sarcomas which occur in the endometrial
stroma, and adenocarcinomas which occur in the glandular lining of the
uterus. Ninety-five percent of uterine cancers are adenocarcinomas and
is referred to as either uterine cancer or endometrial cancer.
There are some pre-malignant changes that can occur in women, even young
women who do not ovulate regularly and it is called endometrial
hyperplasia. This is usually diagnosed by a biopsy of the endometrial
lining. It is not cancer but the normal treatment is usually a
hysterectomy or high dose progesterone therapy. In a young woman, the
treatment for the pre-malignancy may include medication that will cause
ovulation.
The adenocarcinomas are graded.
- Grade I means that the cells are easily
identified as coming from the glandular tissue and have easily
identifiable glandular structures.
- Grade II are intermediate and
moderately differentiated, meaning not as easily identified.
- Grade III
is indicated when there is a loss of glandular structure and it appears
as just solid cancer.
Grade I has the best prognosis and Grade III has
the worst prognosis.
There are two subtypes of uterine adenocarcinomas, papillary serous
adenocarcinomas and clear cell adenocarcinoma, which are considered
different because they have an increased potential to spread throughout
the abdomen and they behave similar to ovarian cancer.
There are several risk factors for uterine cancer.
- Age (considered most important risk factor) - This cancer can affect
both post and peri menopausal women.
- Estrogen - Uterine cancer has been associated with estrogen as estrogen
stimulates the endometrial glands to grow. If you do not ovulate, the
ovary will continue to make estrogen and increase the risk of cancer.
If a woman is post-menopausal and is taking estrogen, she will also have
an increased risk of developing cancer of the uterus and is normally why
progestin is also prescribed to post-menopausal women.
- Tamoxifen - If a woman is taking tamoxifen for breast cancer, she is
also at an increased risk for uterine cancer because Tamoxifen is a type
of estrogen. The increased risk is about five to twelve times more than
the normal risk.
Other risk factors include early start of menstration, late menopause,
no children, failure to ovulate and obesity.
Symptoms of Uterine Cancer
There are several symptoms of uterine cancer but the most common symptom
is abnormal bleeding. Other symptoms may include:
- abnormal vaginal
discharge
- difficult/painful urination
- pain during intercourse or pain
in the pelvic area
It is important to remember that these symptoms can
be caused by conditions that are not cancer but it is always best to see
your doctor if you have these symptoms to determine the cause.
Any woman who is post-menopausal that has bleeding should be seen by
her doctor and be checked for uterine cancer. This would be done by an
endometrial biopsy. Sometimes a doctor will perform the procedure by
using a scope that is inserted through the cervix so that the lining can
be seen and biopsied and this is called a hysteroscopy. With uterine
cancer, it is found that the abnormal bleeding is an early symptom and
if it is not ignored, diagnosis can be made early, which is why the
death rate for uterine cancer is low, despite that it is the most
frequently diagnosed gynecologic cancer.
At present there are no screening recommendations for uterine cancer.
The only screening procedure is an endometrial biopsy and some do
recommend that any woman taking estrogen only or taking Tamoxifen should
have a biopsy yearly. The pap test is not adequate for finding uterine
cancer though occasionally it can be found by a pap test.
If you suspect that you might have uterine cancer, you can expect your
dr to perform one or more of the following procedures. The first
procedure would most likely be an endometrial biopsy or hysteroscopy
(using a scope inserted in the cervix to view the lining and take a
biopsy). It is also possible that your doctor may wish to do a D&C.
Staging
There are several stages of uterine cancer:
- Stage I - Cancer is just in the lining of the uterus.
- Stage Ia - There is no invasive into the uterine wall.
- Stage Ib - There is invasion of less than one-half of the uterine wall.
- Stage Ic - There is invasion of more than one-half of the uterine wall.
- Stage II - The cancer extends into the cervix.
- Stage IIa - The cancer only extends superficially along the endocervix
- Stage IIb - The cancer extends deep into the cervix.
- Stage III - The cancer has spread beyond the uterus.
- Stage IIIa - The cancer involes the tubes or ovaries.
- Stage IIIb - The cancer has spread to the vagina.
- Stage IIIc - The cancer has spread to the pelvic or aortic lymph nodes.
- Stage IV - There are distant metastases present.
- Stage IVa - There is cancer present inside the bladder or rectum.
- Stage IVb - Cancer is present throughout the abdomen or distant sites.
Treatment
Uterine cancer is usually treated with a combination of surgery and
radiation. Women in the early stage will first undergo the removal of
their uterus, tubes and ovaries to confirm the stage. If there is just
limited invasion into the wall and only grade I or II, radiation will
not be recommended. Anything greater than that, the doctor will most
likely advise radiation of the pelvis. The advanced stages of uterine
cancer are sometimes treated by radiation (if possible) and chemotherapy
and progesterone is a good chemotherapy drug for uterine cancer. The
cure rate for uterine cancer does drop by 20% if a hysterectomy is not
performed.
Prognosis
The five year survival rate for uterine cancer varies according to the
stage of the disease. There is an 80% five year survival rate for women
with Stage I uterine cancer, 65% for those with Stage II, 30% for those
with Stage III, and 10% for those with Stage IV. It is also stated that
those who have Stage Ia, Grade I uterine cancer have a five year
survival rate over 95%.
Uterine Sarcomas are a rare cancer and there are several types that go
from low grade to high grade malignancies. At present there are no
standard treatments for uterine sarcomas. The other type of uterine
cancer, leiomyosarcomas are graded according to the number of cells that
are undergoing cell division. If there are not many dividing cells, it
would be considered either low grade cancer or not cancer at all, but if
the number is high, it would be considered an aggressive cancer. With
leiomyosarcomas, stage I can still be very aggressive if it is high
grade and most likely will recur. Research has not proved that
radiation or chemotherapy is effective in preventing a recurrence of
leiomyosarcomas.
Uterine cancer is not an easily prevented cancer, but there are some
recommendations. Women should try to maintain an ideal weight, make
sure to get annual pelvic exams, and have endometrial biopsies after
menopause if she is at high risk. Also the use of birth control pills
or other progeterone therapies can reduce the risk of uterine cancer.