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Colorectal Cancer
In
the digestive system, the colon is the organ responsible for storing the body's
waste. The rectum is the canal connecting the colon and anus. Collectively,
these two organs are known as the large intestine. Cancers of the large
intestine can be referred to as colon cancer, rectal cancer or colorectal cancer
depending on the location of the cancer.
The incidence of colorectal cancer depends on the
existence of tumors, which are growths that begin on the lining or wall of the
large intestine. Not all tumors are cancerous. Non-cancerous, or benign tumors
are called polyps. These type of tumors are not life-threatening, and can be
treated with a procedure called a colonoscopy. However, if left untreated for a
period of time, polyps can transform into cancerous or malignant tumor cells.
Malignant tumors are very serious and life-threatening--especially if the cancer
has spread to other organs of the body. Colorectal cancer commonly spreads to
the liver and the lungs. In such cases, a cancer patients chances for survival
are very unlikely.
Fortunately, there are procedures available that can
help physicians detect cancer early, in addition to several treatments that can
help cancer patients return to a normal lifestyle. Also, being aware of risk
factors and symptoms can help you stay one step ahead of colorectal cancer,
catching it while treatment can still be highly effective.
Risk Factors
There are several risk factors for colorectal cancer:
 | Diet: eating foods that are high in fat and low in
fiber increases your risk of developing colorectal cancer. It is believed
that some of the elements present during the breakdown of fat can be
carcinogenic (cancer-causing). In contrast, diets that are rich in fiber
including grains and vegetables can help guard against colon cancer.
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 | Family history: individuals with first-degree
relatives (parents, children, siblings) who have had colorectal cancer are
more likely to develop this type of cancer themselves. |
 | Personal history: patients who have survived this
type of cancer are at risk for a recurrence. Research shows that women who
have had ovarian, uterine or breast cancer are also at greater risk of
developing colorectal cancer. |
 | Polyps: patients with a history of polyps in the
colon are at greater risk of developing cancer in this area. Removing benign
polyps can reduce a person's chance of developing colorectal cancer.
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 | Age: individuals above the age of 50 are at greater
risk of developing colon cancer. |
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Ulcerative Colitis: a
disease characterized by inflammation of the colon wall increases a person's
chance of developing colorectal cancer. |
In contrast to these factors, there are also steps an
individual can take to reduce their risk of developing colon cancer. In
addition to removing benign polyps and following a high-fiber/low fat diet,
individuals can also monitor any genetic change that may lead to colorectal
counselor. You may choose to see a genetic counselor to be screened for genetic
changes of this kind. Speak with your physician to see of you are a good
candidate. Also, studies show that reducing your consumption of aspirin and
alcohol as well as the cessation of smoking and an increase in physical activity
can reduce your chances of developing colorectal cancer.
Early Detection
If you are at risk for colon cancer or are over the age
of 40, early detection methods will be key in your fight against cancer. These
tests should be done regardless of whether there are symptoms present. Speak
with your physician to find out when you should begin any of the following
procedures:
 | Fecal Occult Blood Test (FOTB): this test analyzes
stool samples for the presence of blood. Blood in the stool may be a sign of
cancer; however, it may also be a symptom of other conditions as well
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Sigmoidoscopy: this
procedure can also be used to remove tissue samples that can be analyzed for
cancer. It is recommended that high risk patients and individuals over 40
have this procedure done as a precaution every 3-5 years. Discuss your time
frame with your physician. |
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Colonoscopy: this
procedure can also be used to remove tissue samples for further analysis.
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 | Double Contrast
Barium Enema (DCBE):
this procedure can be used to determine the presence of polyps and tumors in
the colon. |
 | Digital Rectal Exam: the physician will stick a
gloved, lubricated finger into your rectum to feel for abnormalities in the
lining. |
 | Carcinoembryonic Antigen (CEA) Test: this substance
is found in abundance when there is cancer present. |
Symptoms
Symptoms of colorectal cancer are variable and
non-specific. In some cases, it may take years for symptoms to develop
depending on where the original tumor is located. Therefore, you should discuss
any abnormalities with your physician in addition to discussing early detection
methods. The following are symptoms associated with colorectal cancer:
 | change in bowel habits |
 | diarrhea or constipation |
 | feeling that your bowel does not empty completely
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 | narrow stool |
 | blood in stool |
 | abdominal discomfort: cramps, painful gas, bloating
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 | weight loss for unknown reason |
 | fatigue |
 | vomiting |
Diagnosis
Many of the techniques used for diagnosing colorectal
cancer are similar to those used in early detection. Sigmoidoscopy, Colonoscopy
and barium enemas may all be used in combination in order to diagnose this type
of cancer. Biopsy, which involves the removal of a tissue sample from the colon
or rectum can also be performed during a colonoscopy or sigmoidoscopy. Another
procedure used to diagnose colorectal cancer is the polypectomy, which is the
removal of polyps during a colonoscopy of sigmoidoscopy.
Once cancer has been diagnosed, it is important for
your physician to determine the stage to which the cancer has progressed.
Determining the stage of cancer is necessary in order to recommend proper
treatment. The following is a general outline of the stages associated with
colorectal cancer:
 | Stage 0: cancer is only found in the
innermost lining of the colon. |
 | Stage 1: cancer involves more of the inner
wall but has not spread to any tissue outside the colon. |
 | Stage 2: cancer has spread to tissue outside
the colon but not the lymph nodes. |
 | Stage 3: cancer has spread to nearby lymph
nodes but not to other organs in the body. |
 | Stage 4: cancer has spread to other parts of
the body. Colorectal cancer commonly spreads to the liver and lungs.
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 | Recurrent: cancer has returned to the colon
or rectum after treatment. |
Treatment
Once the stage of cancer has been determined, a
physician can recommend treatment. The following are forms of treatment used to
fight colorectal cancer. A physician may use these types of treatment in
combination depending on the size, location and stage of cancer present.
 | Surgery: this is the most common form of
treatment for colorectal cancer. During surgery, the cancerous portion of the
colon and rectum is removed in addition to some healthy surrounding tissue and
nearby lymph nodes in order to determine if the cancer has spread. The colon
is then reconnected. In some cases, patients undergo an additional surgical
procedure called a
colostomy. In a colostomy, a surgical
opening is created through the abdomen to allow for the removal of waste. A
bag is attached to the surgical opening where waste can be collected. Most
patients. Sometimes a temporary colostomy is necessary to give time for the
patient's colon to heal. In approximately 15% of cases, when the colon cannot
be reattached a permanent colostomy is necessary. |
Depending on the outcome of the staging process, a
physician may also recommend additional treatment either before, after or in
place of surgery. These types of treatment include:
 | Chemotherapy: destroys cancer cells by using
special drugs-either one or a combination. These drugs may be given via
injection or by mouth. Chemotherapy is a systemic treatment which means the
drugs will flow through your blood to all parts of your body. For patients
undergoing chemotherapy, the side effects depend on the types of drugs used
and the dosages given. However, in general, chemotherapy mostly affects the
cells in the body which divide rapidly; therefore, chemotherapy patients may
experience a wide variety of effects. These include: infection, loss of hair,
poor appetite, nauseam vomiting and mouth sores. Patients may bruise and
bleed easily and have less energy. |
 | Radiation Therapy: bombards cancer-infected
areas with high energy rays to stop cancer cells from growing. This treatment
can be given externally using a machine or internally by placing radioactive
material in or around the affected area. This treatment may also be used
before surgery to decrease the size of the tumor. Patients undergoing
radiation therapy often feel tired; however, patients are encouraged to remain
active. Other side effects include: loss of hair and skin irritation. A
"bronzing" of the skin may also occur in the treated area. It is important to
keep the treated area out of the sun and to refrain from using creams or
lotions without the consent of your physician. Try to avoid wearing clothing
that rubs against the affected areas. Some patients may also experience
diarrhea and discomfort while urinating. |
 | Biological Therapy: designed to improve the
way your immune system fights cancer. This type of treatment is administered
through a vein or by mouth. |
Follow-up
Colorectal cancer patients are still at a higher risk
for cancer recurrence; therefore, it is necessary to continue examinations
proceeding surgery or any other cancer treatment. Cancer recurrence can occur
in or around the previously affected areas or in other organs such as the liver
and lungs. For proper follow-up a physician may perform one or more of the
following procedures:
 | physical examinations |
 | blood test for liver enzymes: elevated enzymes may
indicate that cancer has spread to the liver. |
 | CAT Scan of abdomen and pelvis: can be used to find
tumors in the colon, liver or other organs. |
 | chest x-rays: can be used to find tumors located in
the lungs. |
 | blood CEA levels: rising CEA levels can indicate
cancer recurrence. |
 | colonoscopy |
Patients who have suffered from colon cancer are also
at risk for developing cancer in other areas of the body like the prostate,
breast and ovary; therefore, these areas should be checked as well.
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