Diagnosis and Prognosis of Kidney Cancer
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Diagnosis begins with a visit to the doctor. Most of the time, kidney cancer is noted when an imaging test, such as a ]]>CT scan]]> , is ordered for an unrelated reason. Kidney cancer may have many different symptoms, or no symptoms at all. Some of the symptoms include abdominal pain, blood in the urine, unexplained fever, and weight loss. However, each of these symptoms can be caused by conditions other than kidney cancer. The most common type of kidney cancer is called renal cell carcinoma, but there are several other types.
The diagnosis and prognosis of kidney cancer includes the following:
Your doctor will ask about your symptoms and medical history. He or she will ask when you first noticed the symptoms and how they have progressed. Your doctor will also ask about anything that may increase your risk of kidney cancer, including:
The doctor will perform a physical exam, paying careful attention to any signs that may indicate kidney cancer, such as swelling in the legs or a lump in the abdomen.
Diagnostic tests may include:
Blood and urine tests —These tests are used to check kidney function or to find substances that indicate kidney cancer may be present.
CT scan —This is a type of x-ray that uses a computer to produce cross-sectional images of the inside of the body.
Intravenous pyelogram (IVP)]]> —For this test, a dye is injected into one of your veins and a series of x-rays is taken. The dye courses through the urinary system, allowing x-ray pictures to be more clear and detailed.
Renal angiography —A dye is injected into an artery and a series of x-rays is taken of arteries that are leading to the kidney. The dye coats the blood vessels, making it easier to see abnormalities on the x-ray images. This test is useful in diagnosing renal cancers and can help in identifying arteries, which will help the surgeon during surgical treatment. This test is rarely used now, though.
]]>MRI scan]]> —This test uses magnetic waves to produce images of the inside of the body. Using a large magnet, radio waves, and a computer, an MRI produces 2D and 3D pictures.
Renal ultrasound —This involves the use of sound waves and the characteristic patterns they make bouncing off of various structures in the body to identify tumors and other conditions.
]]>Biopsy]]> —A biopsy is the removal of a sample of kidney tissue to test for cancer cells. This test is rarely needed, since imaging studies usually provide enough information. When a biopsy is done, the doctor inserts a needle through the skin to remove a sample of tissue from the tumor. This tissue is checked for cancer cells.
Cytology is the study of cells. The cytology of cancer cells differs significantly from normal cells, and physicians use the unique cellular features seen on biopsy samples to determine the diagnosis and assess the prognosis of a cancer.
Staging is the process by which physicians determine the prognosis of a cancer that has already been diagnosed. Staging is essential for making treatment decisions (eg, surgery vs. chemotherapy]]> ). Several features of the cancer are used to arrive at a staging classification, the most common being the size of the original tumor, extent of local invasion, and spread to distant sites (metastasis). Low staging classifications (0-1) imply a favorable prognosis, whereas high staging classifications (4-5) imply an unfavorable prognosis.
Additional tests to determine staging may include:
Blood tests —Blood tests may help determine possible cancer spread to other parts of the body and assess your overall health.
CT scan —A series of x-rays are put together by a computer to create images of internal areas where the cancer may have spread.
MRI scan —This test is used to help assess whether the cancer has spread.
Bone scan —For this test, an injection of a radioactive compound called technetium is given. Three hours later, you lie on a table as special cameras move slowly above and below the table taking pictures. These cameras detect small amounts of radioactivity in the injected technetium, allowing the doctor to see areas of the bone that may contain cancer cells.
Stages of Kidney Cancer
Renal cell carcinoma staging considers three categories: tumor, lymph nodes, and metastases (TNM).
Your doctor considers the following factors to determine the stage of renal cell carcinoma:
- The size of the tumor and if it has spread to fatty or connective tissue surrounding the kidney
- Whether the disease has spread to your lymph nodes
- Whether the disease has spread to the bone, liver, or other places outside the kidney
Specific TNM classifications
Kidney Cancer Tumor (T) Stages:
- TX —Primary tumor cannot be assessed (information not available).
- T0 —There is no evidence of a primary tumor.
- T1a —Tumor is 4 cm in diameter or smaller and is limited to the kidney.
- T1b —Tumor is larger than 4 cm but smaller than 7 cm and is limited to the kidney.
- T2 —Tumor is larger than 7 cm but is still limited to the kidney.
- T3a —Tumor has spread into the adrenal gland or into fatty tissue around the kidney, but not beyond a fibrous tissue called Gerota fascia, which surrounds the kidney and nearby fatty tissue.
- T3b —Tumor has spread into the large vein leading out of the kidney (renal vein) and/or the part of the large vein leading into the heart (vena cava) that is within the abdomen.
- T3c —Tumor has reached the part of the vena cava that is within the chest or invades the wall of the vena cava.
- T4 —Tumor has spread beyond Gerota fascia (fibrous tissue that surrounds the kidney and the fatty tissue next to the kidney).
Kidney Cancer Node (N) Stages:
- Stage NX —The lymph nodes near the kidneys cannot be assessed.
- Stage NO —The cancer has not spread to the lymph nodes.
- Stage N1 —The cancer has spread to one lymph node near the kidney.
- Stage N2 —The cancer has spread to more than one lymph node near the kidney.
Kidney Cancer Metastatic (M) Stages:
- Stage MX —It cannot be assessed if the cancer has spread to distant organs.
- Stage MO —The cancer has not spread.
- Stage M1 —The cancer has spread to other parts of the body beyond the kidney area.
Overall Cancer Stage Based on the American Joint Committee on Cancer (AJCC)
Stage I —T1a-T1b, N0, M0
- The tumor is 7 cm or smaller and limited to the kidney.
- There is no spread to lymph nodes or distant organs.
Stage II —T2, N0, M0
- The tumor is larger than 7 cm but is still limited to the kidney.
- There is no spread to lymph nodes or distant organs.
Stage III —T1a-T3b, N1, M0 or T3a-T3c, N0, M0
- There are several combinations of T and N categories that are included in this stage.
- These include any tumor that has spread to one nearby lymph node, but not to more than one lymph node or other organs.
- Stage III also includes tumors that have not spread to lymph nodes or distant organs but have spread to the adrenal glands, to fatty tissue around the kidney, and/or have grown into the large vein (vena cava) leading from the kidney to the heart.
Stage IV —T4, N0-N1, M0 or Any T, N2, M0 or Any T, Any N, M1
- There are several combinations of T, N, and M categories that are included in this stage.
|Overall Stage||T Stage||N Stage||M Stage|
|Stage III||T1a-T1b or T2||N1||M0|
|T3a||N0 or N1||M0|
|T3b||N0 or N1||M0|
|T3c||N0 or N1||M0|
|Any T||Any N||M1|
Prognosis is a forecast of the probable course and/or outcome of a disease or condition. Prognosis is most often expressed as the percentage of patients who are expected to survive over five or ten years. Cancer prognosis is a notoriously inexact process. This is because the predictions are based on the experience of large groups of patients suffering from cancers at various stages. Using this information to predict the future of an individual patient is always imperfect and often flawed, but it is the only method available.
The five-year survival rate for all renal cell cancers is 60%. The five-year survival rate by stage is as follows:
Stage I: 90% to 100%
Stage II: 65% to 75%
Stage III: varies widely, between 40% and 70%
Stage IV: less than 10%
It should be noted that this staging system applies only to renal cell carcinoma, and not to other, less common types of kidney cancer.
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Last reviewed November 2008 by ]]>Mohei Abouzied, MD]]>
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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