Kidney Cancer (cont.)
In this Article
- Kidney cancer facts*
- What are the kidneys?
- What is cancer?
- What are kidney cancer causes and risk factors?
- What are kidney cancer symptoms and signs?
- How is kidney cancer diagnosed?
- How is kidney cancer staging determined?
- Methods of kidney cancer treatment
- What are the side effects of treatment for kidney cancer?
- What happens after treatment for kidney cancer?
- What does the future hold in the field of kidney cancer?
- What resources are there for patients with kidney cancer?
- Find a local Oncologist in your town
What are the kidneys?
The kidneys are a pair of organs on either side of the spine in the lower abdomen. Each kidney is about the size of a fist. Attached to the top of each kidney is an adrenal gland. A mass of fatty tissue and an outer layer of fibrous tissue (Gerota's fascia) enclose the kidneys and adrenal glands.
The kidneys are part of the urinary tract. They make urine by removing wastes and extra water from the blood. Urine collects in a hollow space (renal pelvis) in the middle of each kidney. It passes from the renal pelvis into the bladder through a tube called a ureter. Urine leaves the body through another tube (the urethra).
The kidneys also make substances that help control blood pressure and the production of red blood cells.
What is cancer?
Cancerbegins in cells, the building blocks that make up tissues. Tissues make up the organs of the body.
Normally, cells grow and divide to form new cells as the body needs them. When cells grow old, they die, and new cells take their place.
Sometimes this orderly process goes wrong. New cells form when the body does not need them, and old cells do not die when they should. These extra cells can form a mass of tissue called a growth or tumor.
Tumors can be benign or malignant:
- Benign tumors are not cancer:
- Benign tumors are rarely life threatening.
- Usually, benign tumors can be removed, and they seldom grow back.
- Cells from benign tumors often look very much like normal cells. They do not invade tissues around them or spread to other parts of the body.
- Malignant tumors are cancer:
- Malignant tumors are generally more serious than benign tumors. They may be life threatening.
- Malignant tumors often can be removed, but they can grow back.
- Cells from malignant tumors often look very abnormal. They can invade and damage nearby tissues and organs. Also, cancer cells can break away from a malignant tumor and enter the bloodstream or lymphatic system. That is how cancer cells spread from the original cancer (primary tumor) to form new tumors in other organs. The spread of cancer is called metastasis.
Several types of cancer can start in the kidney. This booklet is about renal cell cancer, the most common type of kidney cancer in adults. This type is sometimes called renal adenocarcinoma or hypernephroma. Another type of cancer, transitional cell carcinoma, starts in the lining of the renal pelvis. It is similar to bladder cancer and is often treated like bladder cancer. Wilms tumor is the most common type of childhood kidney cancer. It is different from adult kidney cancer and requires different treatment. Information about transitional cell carcinoma and Wilms tumor is available from the Cancer Information Service at 1-800-4-CANCER and at http://cancer.gov.
When kidney cancer spreads outside the kidney, cancer cells are often found in nearby lymph nodes. Kidney cancer also may spread through the bloodstream to the lungs, bones, or liver. It may also spread from one kidney to the other.
When cancer spreads (metastasizes) from its original place to another part of the body, the new tumor has the same kind of abnormal cells and the same name as the primary tumor. For example, if kidney cancer spreads to the lungs, the cancer cells in the lungs are actually kidney cancer cells. The disease is metastatic kidney cancer, not lung cancer. It is treated as kidney cancer, not lung cancer. Doctors sometimes call the new tumor metastatic or "distant" disease.
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