Bladder cancer is any of several types of cancer arising from the tissues of the urinary bladder. It is a disease in which cells grow abnormally and have the potential to spread to other parts of the body. Symptoms include blood in the urine, pain with urination, and low back pain.
|Transitional cell carcinoma of the bladder. The white in the bladder is contrast.|
|Symptoms||Blood in the urine, pain with urination|
|Usual onset||65 to 85 years old|
|Types||Transitional cell carcinoma, squamous cell carcinoma, adenocarcinoma|
|Risk factors||Smoking, family history, prior radiation therapy, frequent bladder infections, certain chemicals|
|Diagnostic method||Cystoscopy with tissue biopsies|
|Treatment||Surgery, radiation therapy, chemotherapy, immunotherapy|
|Prognosis||Five-year survival rates ~77% (US)|
|Frequency||3.4 million current cases (2015)|
|Deaths||188,000 per year|
Risk factors for bladder cancer include smoking, family history, prior radiation therapy, frequent bladder infections, and exposure to certain chemicals. The most common type is transitional cell carcinoma. Other types include squamous cell carcinoma and adenocarcinoma. Diagnosis is typically by cystoscopy with tissue biopsies. Staging of the cancer is typically determined by medical imaging such as CT scan and bone scan.
Treatment depends on the stage of the cancer. It may include some combination of surgery, radiation therapy, chemotherapy, or immunotherapy. Surgical options may include transurethral resection, partial or complete removal of the bladder, or urinary diversion. Typical five-year survival rates in the United States are 77%.
Bladder cancer, as of 2015, affects about 3.4 million people globally with 430,000 new cases a year. In 2015 it resulted in 188,000 deaths. Age of onset is most often between 65 and 85 years of age. Males are more often affected than females. In the United States in 2018 81,000 cases and 17,000 deaths are expected making it the 6th most common type of cancer in the region.
Signs and symptomsEdit
Bladder cancer characteristically causes blood in the urine (hematuria), which may be visible (gross/macroscopic hematuria) or detectable only by microscope (microscopic hematuria). Blood in the urine is the most common symptom in bladder cancer, and is painless. Visible blood in the urine may be of only short duration, and a urine test may be required to confirm non visible blood. Between 80-90% of people with bladder cancer initially presented with visible blood. Blood in the urine may also be caused by other conditions, such as bladder or ureteric stones, infection, kidney disease, kidney cancers or vascular malformations, though these conditions (except kidney cancers) would typically be painful.
Other possible symptoms include pain during urination (dysuria), frequent urination, or feeling the need to urinate without being able to do so. These signs and symptoms are not specific to bladder cancer, and may also be caused by non-cancerous conditions, including prostate infections, overactive bladder or cystitis.
Patients with advanced disease refer pelvic or bony pain, lower-extremity swelling, or flank pain. Rarely, a palpable mass can be detected on physical examination.
Tobacco smoking is the main known contributor to urinary bladder cancer; in most populations, smoking is associated with over half of bladder cancer cases in men and one-third of cases among women, however these proportions have reduced over recent years since there are fewer smokers in Europe and North America. There is an almost linear relationship between smoking duration (in years), pack years and bladder cancer risk. A risk plateau at smoking about 15 cigarettes a day can be observed (meaning that those who smoke 15 cigarettes a day are approximately at the same risk as those smoking 30 cigarettes a day). Quitting smoking reduces the risk, however former smokers will most likely always be at a higher risk of bladder cancer compared to people who have never smoked. Passive smoking does not appear to be a risk.
Thirty percent of bladder tumors probably result from occupational exposure in the workplace to carcinogens such as benzidine. 2-Naphthylamine, which is found in cigarette smoke, has also been shown to increase bladder cancer risk. Occupations at risk are bus drivers, rubber workers, painters, motor mechanics, leather (including shoe) workers, blacksmiths, machine setters, and mechanics. Hairdressers are thought to be at risk as well because of their frequent exposure to permanent hair dyes.
In addition to these major risk factors there are also numerous other modifiable factors that are less strongly (i.e. 10–20% risk increase) associated with bladder cancer, for example, obesity. Although these could be considered as minor effects, risk reduction in the general population could still be achieved by reducing the prevalence of a number of smaller risk factor together.
Currently, the best diagnosis of the state of the bladder is by way of cystoscopy, which is a procedure in which a flexible or rigid tube (called a cystoscope) bearing a camera and various instruments is introduced into the bladder through the urethra. The procedure allows for a visual inspection of the bladder, for minor remedial work to be undertaken and for samples of suspicious lesions to be taken for a biopsy. A rigid cystoscope is used under general anesthesia in the operating room and can support remedial work and biopsies as well as more extensive tumor removal.
Urine cytology can be obtained in voided urine or at the time of the cystoscopy ("bladder washing"). Cytology is not very sensitive (a negative result cannot reliably exclude bladder cancer). There are newer non-invasive urine bound markers available as aids in the diagnosis of bladder cancer, including human complement factor H-related protein, high-molecular-weight carcinoembryonic antigen, and nuclear matrix protein 22 (NMP22). NMP22 is also available as a prescription home test. Other non-invasive urine based tests include the CertNDx Bladder Cancer Assay, which combines FGFR3 mutation detection with protein and DNA methylation markers to detect cancers across stage and grade, UroVysion, and Cxbladder.
The diagnosis of bladder cancer may be assisted by blue light cystoscopy as an add on to conventional white-light cystoscopy.
However, visual detection in any form listed above, is not sufficient for establishing pathological classification, cell type or the stage of the present tumor. A so-called cold cup biopsy during an ordinary cystoscopy (rigid or flexible) will not be sufficient for pathological staging either. Hence, a visual detection needs to be followed by transurethral surgery. The procedure is called transurethral resection of bladder tumor (TURBT). Further, bimanual examination should be carried out before and after the TURBT to assess whether there is a palpable mass or if the tumour is fixed ("tethered") to the pelvic wall. The pathological classification obtained by the TURBT-procedure, is of fundamental importance for making the appropriate choice of ensuing treatment and/or follow-up routines.
95% of bladder cancers are transitional cell carcinoma. The other 5% are squamous cell carcinoma, adenocarcinoma, sarcoma, small cell carcinoma, and secondary deposits from cancers elsewhere in the body.
Bladder cancer is staged (classified by the extent of spread of the cancer) and graded (how abnormal and aggressive the cells appear under the microscope) to determine treatments and estimate outcomes.
T (Primary tumour)
- TX Primary tumour cannot be assessed
- T0 No evidence of primary tumour
- Ta Non-invasive papillary carcinoma
- Tis Carcinoma in situ ('flat tumour')
- T1 Tumour invades subepithelial connective tissue
- T2a Tumour invades superficial muscle (inner half)
- T2b Tumour invades deep muscle (outer half)
- T3 Tumour invades perivesical tissue:
- T3a Microscopically
- T3b Macroscopically (extravesical mass)
- T4a Tumour invades prostate, uterus or vagina
- T4b Tumour invades pelvic wall or abdominal wall
N (Lymph nodes)
- NX Regional lymph nodes cannot be assessed
- N0 No regional lymph node metastasis
- N1 Metastasis in a single lymph node 2 cm or less in greatest dimension
- N2 Metastasis in a single lymph node more than 2 cm but not more than 5 cm in greatest dimension, or multiple lymph nodes, none more than 5 cm in greatest dimension
- N3 Metastasis in a lymph node more than 5 cm in greatest dimension
M (Distant metastasis)
- MX Distant metastasis cannot be assessed
- M0 No distant metastasis
- M1 Distant metastasis.
- Stage 0a: Ta, N0, M0
- Stage 0is: Tis, N0, M0
- Stage I: T1, N0, M0
- Stage II: T2a or T2b, N0, M0
- Stage III: T3a, T3b, or T4a, N0, M0
- Stage IV; any of the following:
- T4b, N0, M0
- any T, N1 to N3, M0
- any T, any N, M1
By the WHO classification of 1973, bladder cancers are histologically graded into:
- G1 - Well differentiated,
- G2 - Moderately differentiated
- G3 - Poorly differentiated
In 2013 a preliminary, small study of 98 samples of urine, all from men—24 who had cancer, and 74 with bladder-related problems but no cancer yet used a gas chromatograph to successfully examine the vapor from heated urine samples to identify cancer.
A 2008 study commissioned by the World Health Organisation concluded that "specific fruit and vegetables may act to reduce the risk of bladder cancer." Fruit and yellow-orange vegetables, particularly carrots and those containing selenium, are probably associated with a moderately reduced risk of bladder cancer. Citrus fruits and cruciferous vegetables were also identified as having a possibly protective effect. However an analysis of 47,909 men in the Health Professionals Follow-Up Study showed little correlation between cancer reduction and high consumption of fruits and vegetables overall, or yellow or green leafy vegetables specifically, compared to the statistically significant reduction among those men who consumed large amounts of cruciferous vegetables.
In a 10-year study involving almost 49,000 men, researchers found that men who drank at least 1,44 L of water (around 6 cups) per day had a significantly reduced incidence of bladder cancer when compared with men who drank less. It was also found that: "the risk of bladder cancer decreased by 7% for every 240 mL of fluid added". The authors proposed that bladder cancer might partly be caused by the bladder directly contacting carcinogens that are excreted in urine, although this has not yet been confirmed in other studies.
The treatment of bladder cancer depends on how deeply the tumor invades into the bladder wall.
Superficial tumors (those not entering the muscle layer) can be "shaved off" using an electrocautery device attached to a cystoscope, which in that case is called a resectoscope. The procedure is called transurethral resection of bladder tumor—TURBT—and serves primarily for pathological staging. In case of non-muscle invasive bladder cancer the TURBT is in itself the treatment, but in case of muscle invasive cancer, the procedure is insufficient for final treatment.
Immunotherapy by intravesicular delivery of Bacillus Calmette–Guérin (BCG) is also used to treat and prevent the recurrence of superficial tumors. BCG is a vaccine against tuberculosis that is prepared from attenuated (weakened) live bovine tuberculosis bacillus, Mycobacterium bovis, that has lost its virulence in humans. BCG immunotherapy is effective in up to 2/3 of the cases at this stage, and in randomized trials has been shown to be superior to standard chemotherapy. The mechanism by which BCG prevents recurrence is unknown, but the presence of bacteria in the bladder may trigger a localized immune reaction which clears residual cancer cells.
Patients whose tumors recurred after treatment with BCG are more difficult to treat. Many physicians recommend cystectomy for these patients. This recommendation is in accordance with the official guidelines of the European Association of Urologists (EAU) and the American Urological Association (AUA) However, many patients refuse to undergo this life changing operation, and prefer to try novel conservative treatment options before opting to this last radical resort. Device assisted chemotherapy is one such group of novel technologies used to treat superficial bladder cancer. These technologies use different mechanisms to facilitate the absorption and action of a chemotherapy drug instilled directly into the bladder. Another technology - electromotive drug administration (EMDA) – uses an electric current to enhance drug absorption after surgical removal of the tumor. Another technology, thermotherapy, uses radio-frequency energy to directly heat the bladder wall, which together with chemotherapy shows a synergistic effect, enhancing each other's capacity to kill tumor cells. This technology has been studied by a number of different investigators.
Muscle invasive diseaseEdit
Untreated, superficial tumors may gradually begin to infiltrate the muscular wall of the bladder. Tumors that infiltrate the bladder wall require more radical surgery, where part or all of the bladder is removed (a cystectomy) and the urinary stream is diverted into an isolated bowel loop (called an ileal conduit or urostomy). In some cases, skilled surgeons can create a substitute bladder (a neobladder) from a segment of intestinal tissue, but this largely depends upon patient preference, age of patient, renal function, and the site of the disease.
To treat an invasive tumor, a combination of radiation and chemotherapy in conjunction with transurethral (endoscopic) bladder tumor resection can be used. Review of available large data series on this so-called trimodality therapy has indicated similar long-term cancer specific survival rates, with improved overall quality of life as for patients undergoing radical cystectomy with urinary reconstruction. These patients are usually highly selected and do not have multi-focal disease or carcinoma in-situ, which is associated with a higher rate of recurrence, progression, and death from bladder cancer versus patients who undergo radical cystectomy.
For muscle invasive urothelial urinary bladder cancer there are a number of treatment options. The best approach is radical cystectomy, as mentioned. In males, this usually includes also the removal of the prostate; and in females it involves removal of ovaries, uterus and parts of the vagina.
In order to address the problem of micrometastatic disease, which in itself has implications on longtime survival, new treatment options are needed. Micrometastatic dissemination is often not treatable with only major surgery and the concept of neoadjuvant chemotherapy has evolved. In this, people first receive systemic cisplatin-based combination chemotherapy in 3 or 4 cycles, and after that proceed to major surgery. Survival benefits are between 5–8%, in a typical follow up time of 5 years.
Globally, in 2010, bladder cancer resulted in 170,000 deaths up from 114,000 in 1990. This is an increase of 19.4%, adjusted for increase in total world population.
In the United States, bladder cancer is the fourth most common type of cancer in men and the ninth most common cancer in women. More than 50,000 men and 16,000 women are diagnosed with bladder cancer each year. Smoking can only partially explain this higher incidence in men. One other reason is that the androgen receptor, which is much more active in men than in women, plays a major part in the development of the cancer.
Bladder cancer is the seventh most common cancer in the UK (around 10,400 people were diagnosed with the disease in 2011), and it is the seventh most common cause of cancer death (around 5,200 people died in 2012).
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