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Ureteral cancer is cancer of the , muscular tubes that propel urine from the to the urinary bladder. It is also known as ureter cancer, Ureter Cancer, Mayo Clinic renal pelvic cancer, and rarely ureteric cancer or uretal cancer. Cancer in this location is rare. Ureteral cancer becomes more likely in older adults, usually ages 70–80, who have previously been diagnosed with bladder cancer.
Ureteral cancer is usually a transitional cell carcinoma. Transitional Cell Cancer (Kidney/Ureter), National Cancer Institute Transitional cell carcinoma is "a common cause of ureter cancer and other urinary (renal pelvic) tract cancers." Because the inside of the ureters and the inside of the bladder contain the same cell type, people who have been diagnosed with ureteral cancer are more likely to also be diagnosed with bladder cancer, and vice versa.
Ureteral cancer oftentimes doesn't present with any unusual symptoms until the cancer has progressed. Once the cancer has progressed it often causes hematuria, frequent urination, nocturia, and many other urination problems, as well as unusual weight loss and fatigue. It has not become clear to doctors what specifically causes this disease but there are many well known risk factors, many of which are common to a variety of cancers.
A diagnosis can be made in different ways, but some of the most common diagnostic tools are intravenous pyelography and computed tomography urography. Once a diagnosis is made, there are many different treatment methods, which will be dependent upon the nature of the cancer and the patient's wishes.
The risk of developing ureteral cancer increases with age. In addition to increasing age, previous bladder or kidney cancer diagnoses may also increase the risk of developing ureteral cancer. HNPCC (hereditary nonpolyposis colorectal cancer), also known as lynch syndrome, leads to an increased risk of developing ureteral cancer, as well as various other cancers such as colon cancer. Aside from genetic factors and predisposition to developing cancer, there are also a few environmental factors and lifestyle choices that may significantly escalate the chances of being diagnosed with ureteral cancer. For example, taking an overabundance of pain medications such as phenacetin, a probable carcinogen, can lead to an increased risk. Exposure to certain chemicals used to produce leather goods, plastics, rubber, etc. have also been proven to influence the likeliness of developing ureteral cancer. As with many other types of cancer, tobacco smoking is also associated with an increased risk of ureteral cancer.
Stage 0 can be divided into stages 0a and 0is and occurs when abnormal cells appear in the tissue lining the inside of the ureter. Stage 0a (noninvasive papillary carcinoma) is when long, thin growths extend from the tissue lining the ureter. Stage 0is (carcinoma in situ) is a flat tumor located on the tissue lining.
Other classifications of transitional cell cancer of the ureter include localized, regional, metastatic, and recurrent. Localized means that the cancer has remained at the point of origin (ureter). Regional indicates that the cancer has spread to tissues, lymph nodes, or blood vessels in the vicinity. Metastatic cancer means that it has spread to other parts of the body. Recurrent means that the cancer has returned after treatment has been completed; this can occur in the same location or other parts of the body.
After a diagnosis of ureteral cancer, surgery is oftentimes recommended to help remove the infected ureter. For early stage ureteral patients, removing only a portion of the ureter can be successful, whereas in more advanced cases full removal of the ureter as well as the associated kidney (nephroureterectomy) and part of the bladder is sometimes necessary. In less advanced cases where the cancer is only on the surface of the ureter, electrosurgery or laser therapy may be performed to remove the affected cells. Electrosurgery uses an electric current, whereas laser therapy involves passing a ureteroscope through the bladder and into the urethra where a beam of the laser is used to destroy the cells.
Chemotherapy has many different uses in treating ureteral cancer. Prior to surgery, chemotherapy is sometimes used to help shrink the tumor so that it can be more easily removed. Chemo may also be used in more advanced cases to control the symptoms and side effects of the cancer. After surgery to remove the tumor, a single dose of chemotherapy injected into the bladder is helpful in reducing the rate of cancer recurrence in people who have cancer of the inner lining of the bladder (upper tract urothelial carcinoma). Serious side effects don't seem to be increased by chemotherapy.
Advanced ureteral cancer cases may often be treated with immunotherapy when other treatment methods are not successful. Immunotherapy uses the body's own immune system to fight the cancer by helping the immune system to recognize these cancer cells as foreign.
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