What is kidney cancer?
Most cancers are named after the part of the body where the cancer first begins, and kidney cancer is no exception. Kidney cancer begins in the kidneys--two large, bean-shaped organs--one located to the left, and the other to the right of the backbone. Renal is the Latin word for kidney, and kidney cancer may also be referred to as renal cancer. According to the American Cancer Society (ACS), about 65,000 people in the U.S. were expected to be diagnosed with kidney and renal pelvic cancers in 2012. The most common type is called renal cell cancer. The information contained on this page refers to renal cell cancer.
What are the risk factors for renal cell cancer?
The exact cause of renal cell cancer is unknown. However, there are certain risk factors that are linked to it. These risk factors, according to the ACS, are as follows:
Smoking. Smoking increases the risk of kidney cancer. The risk seems related to the amount you smoke.
Asbestos. Studies show a link between exposure to asbestos and kidney cancer.
Cadmium. There may be a link between cadmium exposure and kidney cancer. Cadmium may increase the cancer-causing effect of smoking.
Family history. Family history of kidney cancer increases a person's risk.
Gender. Men are twice as likely to develop renal cell cancer than women.
Von Hippel-Lindau syndrome. This is a disease caused by a gene mutation that increases the chances of renal cell cancer.
Birt-Hogg-Dube syndrome. Patients who have this disease are more likely to develop renal cell cancer.
Other hereditary syndromes. Patients with hereditary papillary renal cell carcinoma, hereditary leiomyoma-renal cell carcinoma, and hereditary renal oncocytoma are more likely to develop kidney cancer.
Obesity. Obesity increases a person's risk of kidney cancer.
Advanced kidney disease. Patients with advanced kidney disease who have been on dialysis for a long time may develop renal cell cancer.
High blood pressure. Patients who have high blood pressure have a higher risk for kidney cancer.
Diuretics (water pills). Drugs that eliminate excess body fluid may raise the risk of kidney cancer, although this is not clear.
Race. African-Americans have a slightly higher risk of kidney cancer.
What are the symptoms of renal cell cancer?
The following are the most common symptoms of renal cell cancer. However, each individual may experience symptoms differently. The symptoms of renal cell cancer may resemble other conditions or medical problems. Always consult your doctor for a diagnosis. Symptoms may include:
- Blood in the urine
- Rapid, unexplained weight loss
- Low back pain (not caused by an injury)
- Loss of appetite
- Swelling of ankles and legs
- Mass or lump on the side or lower back
- Recurrent fever (not caused by a cold or the flu)
- High blood pressure (less frequently)
- Anemia (less frequently)
- Unrelieved pain in the side
How is kidney cancer (renal cell cancer) diagnosed?
In addition to a complete medical history and physical examination, diagnostic procedures for kidney cancer may include the following:
Blood and urine laboratory tests
Intravenous pyelogram (IVP). A series of X-rays of the kidney, ureters, and bladder with the injection of a contrast dye into the vein to detect tumors, abnormalities, kidney stones, or any obstructions, and to assess renal blood flow.
Renal angiography (also called arteriography). A series of X-rays with the injection of a contrast dye into a catheter, which is placed into the blood vessels of the kidney, to detect any signs of blockage or abnormalities affecting the blood supply to the kidneys.
Other imaging tests (to show the difference between diseased and healthy tissues), including the following:
Computed tomography scan (also called a CT or CAT scan). A noninvasive type of X-ray procedure that takes horizontal, or axial, images of the brain or other internal organs to detect any abnormalities that may not show up on an ordinary X-ray.
Magnetic resonance imaging (MRI). A noninvasive procedure that uses radio waves and strong magnets to produce very detailed two-dimensional views of an internal organ or structure, especially the brain and spinal cord.
Ultrasound (also called sonography). A diagnostic imaging technique that uses high-frequency sound waves and a computer to create images of blood vessels, tissues, and organs. Ultrasounds are used to view internal organs as they function, and to assess blood flow through various vessels.
Chest X-ray. A diagnostic test that uses invisible electromagnetic energy beams to produce images of internal tissues, bones, and organs on film.
Bone scan. A nuclear imaging method to evaluate any degenerative and/or arthritic changes in the joints to detect bone diseases and tumors to determine the cause of bone pain or inflammation.
Based on results of other tests and procedures, a biopsy may be needed. A biopsy is a procedure in which a sample of the tumor is removed and sent to the laboratory for examination by a pathologist.
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