Anal Cancer (cont.)
Certain factors affect the prognosis (chance of
recovery) and treatment options.
The prognosis (chance of recovery) depends on the following:
- The size of the tumor.
- Where the tumor is in the anus.
- Whether the cancer has spread to the lymph nodes.
The treatment options depend of the following:
- The stage of the cancer.
- Where the tumor is in the anus.
- Whether the patient has human immunodeficiency virus (HIV).
- Whether cancer remains after initial treatment or has recurred.
Stages of Anal Cancer
After anal cancer has been diagnosed, tests are done to find out if cancer
cells have spread within the anus or to other parts of the body.
The process used to find out if cancer has spread within the anus 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. The following tests may be used in the staging
process:
- CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, taken from different angles. The pictures are made by a computer linked to an x-ray machine. A dye may be injected into a vein or swallowed to help the organs or tissues show up more clearly. This procedure is also called computed tomography, computerized tomography, or computerized axial tomography. For anal cancer, a CT scan of the pelvis and abdomen may be done.
- Chest x-ray: An x-ray of the organs and bones inside the chest. An x-ray is a type of energy beam that can go through the body and onto film, making a picture of areas inside the body.
- Endo-anal or endorectal ultrasound: A procedure in which an ultrasound transducer (probe) is inserted into the anus or rectum and used to bounce high-energy sound waves (ultrasound) off internal tissues or organs and make echoes. The echoes form a picture of body tissues called a sonogram.
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 anal cancer:
Stage 0 (Carcinoma in Situ)
In stage 0, cancer is found only in the innermost lining of the anus. These abnormal cells may become cancer and spread into nearby normal tissue. Stage 0
cancer is also called carcinoma in situ.
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| Pea, peanut, walnut, and lime show tumor sizes. |
Stage I
In stage I, cancer has formed and the tumor is 2 centimeters or smaller.
Stage II
In stage II, the tumor is larger than 2 centimeters.
Stage IIIA
In stage IIIA, the tumor may be any size and has spread to either:
- lymph nodes near the rectum; or
- nearby organs, such as the vagina, urethra,
and bladder.
Stage IIIB
In stage IIIB, the tumor may be any size and has spread:
- to nearby organs and to lymph nodes near the rectum;
or
- to lymph nodes on one side of the pelvis and/or groin, and may have spread
to nearby organs; or
- to lymph nodes near the rectum and in the groin, and/or to lymph nodes
on both sides of the pelvis and/or groin, and may have spread to nearby organs.
Stage IV
In stage IV, the tumor may be any size and cancer may have spread to lymph
nodes or nearby organs and has spread to distant parts of the body.
Next: What is recurrent anal cancer? »
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