Patient Education - Endocrine Encyclopedia
Endocrine Surgery Encyclopedia
Definition:
Cancer involves the uncontrolled growth of abnormal cells that have mutated from
normal tissues. This growth can kill when these cells prevent normal function of
vital organs or spread throughout the body, damaging essential systems.
Alternative Names: Carcinoma; Malignant tumor
Causes, incidence, and risk factors:
There are many different kinds of cancers. Cancer arises out of normal cells in the
body, and can develop in almost any organ or tissue, such as the lung, colon, breast,
skin, bones, or nerve tissue.
In general, cancer appears to be caused by abnormal regulation of cell division.
Cancers can occur when cells divide too rapidly or when cells “forget” how
to die.
There are multiple causes of cancers such as:
- Radiation
- Sunlight
- Tobacco
- Certain viruses
- Benzene
- Certain poisonous mushrooms and aflatoxins (a poison produced by organisms that
can grow on peanut plants)
However, the cause of many cancers remains unknown. The three most common cancers in men in the U.S. are prostate cancer, lung cancer,
and colon cancer. In women here, the three most frequently occurring cancers are
breast cancer, lung cancer, and colon cancer.
The most common cause of cancer-related death is lung cancer.
Certain cancers are more common in particular geographic regions. For example,
in Japan, there are many cases of gastric cancer, while in the US this type of cancer
is relatively rare. Dietary differences may account for the variance.
Symptoms:
Symptoms of cancer depend on the type and location of the tumor. For example, lung
cancer can cause coughing, shortness of breath, or chest pain, while colon cancer
often causes diarrhea, constipation, and blood in the stool.
Some cancers may not have any symptoms at all. However, the following symptoms
are common with most cancers:
- Fever
- Chills
- Night sweats
- Weight loss
- Loss of appetite
- Fatigue
- Malaise
Signs and tests:
Like symptoms, the signs of cancer vary based on the type and location of the tumor.
Common tests include the following:
- CT scan
- Complete blood count (CBC)
- Blood chemistries
- Biopsy of the tumor
- Bone marrow biopsy (for lymphoma or leukemia)
- Chest x-ray
Most cancers are diagnosed by biopsy. Depending on the location of the tumor, the
biopsy may be a simple procedure or a serious operation. Most patients with cancer
undergo CT scans to determine the exact location of the tumor or tumors.
Treatment:
Treatment also varies based on the type of cancer and its stage. The stage of a cancer
refers to how much it has grown and whether the tumor has spread from its original
location.
- If the cancer is confined to one location and has not spread, the goal for treatment
would be surgery and cure. This is often the case with skin cancers.
- If the tumor has spread to local lymph nodes only, sometimes these can also
be removed.
- If all of the cancer cannot be removed with surgery, the options for treatment
include radiation, chemotherapy, or both. Some cancers require a combination of surgery,
radiation, and chemotherapy.
Support Groups:
The diagnosis of cancer often causes a lot of anxiety and can affect a person's entire
life. There are numerous support groups for cancer patients.
Expectations (prognosis):
The outlook varies widely among different types of cancer. Even among people with
one particular type of cancer, the outcome varies depending on the stage of the tumor
at diagnosis. Some cancers can be cured, some that are not curable can still be treated
well, and some patients can live for many years with the cancer. Other tumors are
rapidly fatal.
Complications:
One complication is that the cancer may spread. Other complications vary with the
type and stage of the tumor.
Calling your health care provider:
You should contact your doctor if you develop signs or symptoms suggestive of cancer.
Prevention:
One of the best ways to prevent cancer is to not smoke or chew tobacco. Many cancers
can be prevented by avoiding risk factors such as excessive exposure to sunlight
and heavy drinking.
Cancer screenings, such as mammography and breast examination for breast cancer
and colonoscopy for colon cancer, may help catch these cancers at their early, most
treatable stages. Some people at high risk for developing certain cancers can take
medication to reduce their risk.
Review Date: 6/3/2004
Reviewed By: Robert J. Green, M.D., M.S.C.E., Division of Oncology, Good Samaritan
Medical Center, West Palm Beach, FL. Review provided by VeriMed Healthcare Network.
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