Bladder Cancer

Updated: Apr 24, 2026
  • Author: Samuel G Deem, DO; Chief Editor: Bradley Fields Schwartz, DO, FACS  more...
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Overview

Background

Bladder cancer is a common urologic cancer. Almost all bladder cancers originate in the urothelium, which is a 3- to 7-cell mucosal layer within the muscular bladder.

Urothelial carcinoma

In North America, South America, Europe, and Asia, the most common type of urothelial tumor is urothelial carcinoma (UC), which is also called transitional cell carcinoma; it constitutes more than 90% of bladder cancers in those regions. UC can arise anywhere in the urinary tract, including the renal pelvis, ureter, bladder, and urethra (see Urothelial Tumors of the Renal Pelvis and Ureters), but it is usually found in the urinary bladder. Carcinoma in situ (CIS) is frequently found in association with high-grade or extensive UC. (See the image below.)

Bladder cancer. The classic appearance of carcinomBladder cancer. The classic appearance of carcinoma in situ is as a flat, velvety patch. However, using special staining techniques such as 5-aminolevulinic acid, it has been shown that significant areas of carcinoma in situ are easily overlooked by conventional cystoscopy. Courtesy of Abbott and Vysis Inc.

Squamous cell carcinoma

Squamous cell carcinoma (SCC) is the second most common cell type associated with bladder cancer in industrialized countries. In the United States, around 5% of bladder cancers are SCCs. [1] Worldwide, however, SCC is the most common form of bladder cancer, accounting for 75% of cases in developing nations.

In the United States, the development of SCC is associated with persistent inflammation from long-term indwelling Foley catheters and bladder stones, as well as, possibly, infections. In developing nations, SCC is often associated with bladder infection by Schistosoma haematobium.

Other types of bladder cancer

Approximately 2% of bladder cancers are adenocarcinomas. Nonurothelial primary bladder tumors are extremely rare and may include small cell carcinoma, carcinosarcoma, primary lymphoma, and sarcoma. Small-cell carcinoma of the urinary bladder accounts for only 0.3-0.7% of all bladder tumors. High-grade urothelial carcinomas can also show divergent histologic differentiation, such as squamous, glandular, neuroendocrine, and sarcomatous features.

Phenotypes

Clinical and pathologic data indicate that at least 3 different phenotypes, as follows, exist in urothelial carcinoma [1, 2] :

  • Low-grade proliferative lesions that develop into non–muscle-invasive tumors; these account for approximately 80% of bladder cancers
  • Highly proliferative invasive tumors with a propensity to metastasize
  • CIS, which can penetrate the lamina propria and eventually progress

Go to Oncology Decision Point for expert commentary on bladder cancer treatment decisions and related guidelines. To view a multidisciplinary tumor board case discussion, see Memorial Sloan Kettering e-Tumor Boards: Muscle Invasive Bladder Cancer.

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Anatomy

The bladder is an extraperitoneal muscular urine reservoir that lies behind the pubis symphysis in the pelvis. At the dome of the bladder lies the median umbilical ligament, a fibrous cord that is anchored to the umbilicus and that represents the obliterated urachus (allantois).

The ureters, which transport urine from kidney to bladder, approach the bladder obliquely and posterosuperiorly, entering at the trigone (the area between the interureteric ridge and the bladder neck). The intravesical ureteral orifices are roughly 2-3 cm apart and form the superolateral borders of the trigone. 

In males, the seminal vesicles, vas deferens, ureters, and rectum border the inferoposterior aspect of the bladder. Anterior to the bladder is the space of Retzius, which is composed of fibroadipose tissue and the prevesical fascia. The dome and posterior surface of the bladder are covered by parietal peritoneum, which reflects inferiorly to the seminal vesicles and is continuous with the anterior rectal peritoneum. In females, the posterior peritoneal reflection is continuous with the uterus and vagina.

The vascular supply to the bladder arrives primarily via the internal iliac (hypogastric) arteries, branching into the superior, middle, and inferior vesical arteries, which are often recognizable as lateral and posterior pedicles. The arterial supply also arrives via the obturator and inferior gluteal artery and, in females, via the uterine and vaginal arteries. Bladder venous drainage is a rich network that often parallels the named arterial vessels, most of which ultimately drain into the internal iliac vein.

Initial lymphatic drainage from the bladder is primarily into the external iliac, obturator, internal iliac (hypogastric), and common iliac nodes. Following the drainage to these sentinel pelvic regions, spread may continue to the presacral, paracaval, interaortocaval, and para-aortic lymph node chains.

Almost all bladder cancers originate in the urothelium, which is a 3- to 7-cell mucosal layer within the muscular bladder. Squamous cell carcinoma of the bladder can involve multiple sites; however, this tumor more commonly involves the lateral wall and trigone. All small cell carcinomas of the urinary system identified so far have been located in the urinary bladder, most commonly in the dome and vesical lateral wall. [3]

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Pathophysiology

Bladder cancer is often described as a polyclonal field change defect with frequent recurrences due to a heightened potential for malignant transformation. However, bladder cancer has also been described as resulting from implantation of malignant cells that have migrated from a previously affected site. The latter occurs less often and may account for only a small percentage of cases.

Use of the common term superficial bladder cancer should be discouraged. The term implies a harmless nature, which is misleading in many instances. Because it was used to describe the disparate disorders of low-grade papillary bladder cancer and the markedly more aggressive form, carcinoma in situ (CIS), the World Health Organization (WHO) has recommended it be abandoned.

In its place, the term non–muscle-invasive bladder cancer should be used and qualified with the appropriate American Joint Committee on Cancer stage (ie, Ta, T1, Tis). Stage T1 cancer invades lamina propria but not the muscle of the bladder. High-grade T1 tumor associated with CIS carries a relatively high risk for disease recurrence and progression (approximately 60%).

The current WHO/International Society of Urological Pathology (ISUP) system classifies bladder cancers as low grade or high grade. [4] Tumors are also classified by growth patterns: papillary (70%), sessile or mixed (20%), and nodular (10%). (See the images below.)

 

Bladder cancer. Papillary bladder tumors such as tBladder cancer. Papillary bladder tumors such as this one are typically of low stage and grade (Ta-G1). Courtesy of Abbott and Vysis Inc.
Bladder cancer. Sessile lesions as shown usually iBladder cancer. Sessile lesions as shown usually invade muscle, although occasionally a tumor is detected at the T1-G3 stage prior to muscle invasion. Courtesy of Abbott and Vysis Inc.

Urothelial carcinoma

Urothelial carcinoma (UC) arises from stem cells that are adjacent to the basement membrane of the epithelial surface. Depending on the genetic alterations that occur, these cells may follow different pathways in the expression of their phenotype.

The most common molecular biologic pathway for UCs involves the development of a papillary tumor that projects into the bladder lumen and, if untreated, eventually penetrates the basement membrane, invades the lamina propria, and then continues into the bladder muscle, where it can metastasize.

This progression occurs with high-grade cancers only. Low-grade cancers rarely, if ever, progress and are thought to have a distinct molecular pathway, different from the high-grade cancers and CIS.

CIS, which constitutes 10% of UCs, follows a different molecular pathway. This is a flat, noninvasive, high-grade UC that spreads along the surface of the bladder, staying superficial to the basement membrane. Over time, this may progress to an invasive form of cancer that behaves the same as invasive UC.

Many urothelial tumors are primarily UC but contain areas of squamous differentiation, squamous cell carcinoma (SCC), or adenocarcinoma.

Squamous cell carcinoma

SCC of the urinary bladder is a malignant neoplasm that is derived from bladder urothelium and has a pure squamous phenotype. [5] SCC of the bladder is essentially similar to squamous cell tumors arising in other organs. Because many urothelial carcinomas contain a minor squamous cell component, a diagnosis of SCC of the bladder should be rendered only when the tumor is solely composed of squamous cell components, with no conventional urothelial carcinoma component.

Reportedly, SCC has less of a tendency for nodal and vascular distant metastases than does urothelial carcinoma. [6, 7]

Rare forms of bladder cancer

Adenocarcinomas account for less than 2% of primary bladder tumors. These lesions are observed most commonly in exstrophic bladders and are often associated with malignant degeneration of a persistent urachal remnant.

Other rare forms of bladder cancer include the following:

  • Leiomyosarcoma – The most common sarcoma of the bladder
  • Rhabdomyosarcomas – Most commonly occur in children
  • Lymphoma – Primary bladder lymphoma (eg, mucosa-associated lymphoid tissue [MALT] lymphoma, diffuse large B-cell lymphoma) arises in the submucosa of the bladder; it accounts for 0.2% of all bladder neoplasms and generally follows a silent course with good prognosis; secondary bladder lymphoma occurs in 1.8% of secondary bladder tumors and carries a poorer prognosis [8]
  • Carcinosarcomas – Highly malignant tumors that contain a combination of mesenchymal and epithelial elements.
  • Small cell carcinoma – A poorly differentiated, aggressive malignant neoplasm that originates from urothelial stem cells and has variable expression of neuroendocrine markers; morphologically, it shares features of small cell carcinoma of other organs, including the lung; it comprises less than 1% of bladder cancers; in more than two thirds of cases, small cell carcinoma is mixed with classic urothelial carcinomas, adenocarcinomas, or other histologic types of bladder cancer [9]
  • Paraganglioma – Originates from the paraganglion cells of the urinary bladder and is the same as paraganglioma at other anatomic sites; accounts for less than 0.06% of all bladder tumors and occurs in all age groups; can be functional or nonfunctional, with clinical manifestations of functional tumors caused by catecholamine secretion [10]

Genetic factors in pathogenesis

Divergent, yet interconnected and overlapping, molecular pathways are likely responsible for the development of noninvasive and invasive bladder tumors. Low-grade tumors arise from the more differentiated intermediate cell layer of the urothelium, while while high-grade tumors arise from KRT5+ stem cells in the basal layer. [11]

Low-grade papillary tumors are characterized by hyperproliferation and mutations in genes on chromosome 9 (eg, CDKN2A [p16INK4a] on  9p, PTCH1 and TSC1 on 9q) and in STAG2, KDM6A, FGFR3, RAS, and PI3KCA. High-grade tumors, especially muscle-invasive bladder cancer, feature genomic instability and mutations in TP53, MDM2, and PTEN. [11]

Alterations in the TP53 gene are noted in approximately 60% of invasive bladder cancers. Progression-free survival is significantly shorter in patients with TP53 mutations and is an independent predictor of death among patients with muscle-invasive bladder cancer. [12]

In addition to tumor cell alterations, the microenvironment may promote tumor growth by paracrine influences, including vascular endothelial growth factor (VEGF) production and aberrant E-cadherin expression. Finally, a growing body of research indicates that epigenetic alterations may silence tumor suppressor genes and that they represent important events in tumor progression. [13, 14, 15]

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Etiology

Up to 80% of bladder cancer cases are associated with environmental exposure. Tobacco use is by far the most common cause of bladder cancer in the United States and is increasing in importance in some developing countries. Smoking duration and intensity are directly related to increased risk. [16]  The risk of developing bladder carcinoma is 2-6 times greater in smokers than in nonsmokers. This risk appears to be similar in men and women. [17]  Nitrosamine, 2-naphthylamine, and 4-aminobiphenyl are possible carcinogenic agents found in cigarette smoke.

A number of occupations involve exposure to substances that may increase risk for bladder cancer. Of occupationally related bladder cancer cases, the incidence rate is highest in workers exposed to aromatic amines, while mortality is greatest in those exposed to polycyclic aromatic hydrocarbons and heavy metals. [18]

Numerous occupations associated with diesel exhaust, petroleum products, and solvents (eg, auto work, truck driving, plumbing, leather and apparel work, rubber and metal work) have also been associated with an increased risk of bladder cancer. In addition, increased bladder carcinoma risk has been reported in persons, including the following, who work with organic chemicals and dyes:

  • Beauticians
  • Dry cleaners
  • Painters
  • Paper production workers
  • Rope-and-twine industry workers
  • Dental workers
  • Physicians
  • Barbers

People living in urban areas are also more likely to develop bladder cancer. The etiology in these cases is thought to be multifactorial, potentially involving exposure to numerous carcinogens.

Arsenic exposure may be a factor in the development of bladder cancer. Results of a population-based case-control study in Maine, New Hampshire, and Vermont support an association between low-to-moderate levels of arsenic in drinking water and bladder cancer risk in those states, where incidence rates of bladder cancer have long been about 20% higher than in the United States overall. A likely source of the arsenic is residue of arsenic-based pesticides, which were used extensively on crops such as blueberries, apples, and potatoes in that region from the 1920s through to the 1950s. [19]

Several medical risk factors are associated with an increased risk of bladder cancer, including the following:

  • Radiation treatment of the pelvis

  • Chemotherapy with cyclophosphamide – Increases the risk of bladder cancer via exposure to acrolein, a urinary metabolite of cyclophosphamide, with a median latency of 10 years [20]

  • Spinal cord injuries requiring long-term indwelling urinary catheters – Risk attributed to repeated urinary tract infections and chronic bladder inflammation [21]

  • Bacillus Calmette-Guerin (BCG) treatment for bladder carcinoma in situ has rarely been reported to lead to development of SCC [22]

Although certain common genetic polymorphisms appear to increase susceptibility in persons with occupational exposure associated with increased bladder cancer risk, [23] no convincing evidence exists for a hereditary factor in the development of bladder cancer. Nevertheless, familial clusters of bladder cancer have been reported.

Disorders associated with increased risk of bladder cancer include the following:

  • High plasma fasting glucose [24]
  • Bladder diverticula [25]
  • Bladder exstrophy [26]  
  • Urachal remnants [27]

Coffee consumption does not increase the risk of developing bladder cancer. The International Agency for Research on Cancer classified coffee as possibly carcinogenic to humans in 1991, based on limited epidemiologic evidence of a positive association with bladder cancer, but  downgraded this classification in 2016. The apparent association has been atttributed to a confounding effect of smoking. [28]

Schistosomiasis

In many developing countries, particularly in the Middle East, Schistosoma haematobium infection causes most cases of bladder SCC. In a study from Egypt, 82% of patients with bladder carcinoma harbored S haematobium eggs in the bladder wall. In egg-positive patients, the tumor tended to develop at a younger age (with SCC predominant) than it did in egg-negative persons. A higher degree of adenocarcinoma has also been reported in schistosomal-associated bladder carcinomas. [29]

Along with S haematobium, the species S mansoni and S japonicum are responsible for schistosomiasis in humans. The eggs reside in the pelvic and mesenteric venous plexus. In the bladder, a severe inflammatory response and fibrosis secondary to the deposition of Schistosoma eggs is common. (See the image below.)

 

Bladder cancer. Histopathology of bladder shows egBladder cancer. Histopathology of bladder shows eggs of Schistosoma haematobium surrounded by intense infiltrates of eosinophils and other inflammatory cells.

The eggs are found embedded in the lamina propria and muscularis propria of the bladder wall. Many of the eggs are destroyed by host reaction and become calcified, resulting in a lesion commonly known as a sandy patch, which appears as a granular, yellow-tan surface lesion.

In normal epithelial cells, S haematobium total antigen reportedly induces increased proliferation, migration, and invasion and decreases apoptosis. [30]  Keratinous squamous metaplasia, which is associated with schistosomiasis and other sources of chronic bladder irritation, has a 26-30% risk of progression to SCC, with risk increasing with the extent of bladder wall involvement. [31]  The majority of schistosomiasis-related cases of SCC will arise in the setting of chronic cystitis. [32]

 

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Epidemiology

Occurrence in the United States

The American Cancer Society estimates that 84,530 new cases of bladder cancer will be diagnosed in the United States in 2026 and that 17,870 people will die of the disease. [33]  The incidence of bladder cancer increases with age, with the median age at diagnosis being 73 years; bladder cancer is rarely diagnosed before age 40 years. [34]

Bladder cancer is about 4 times more common in men than in women. [34]  Bladder cancer is the fifth most common cancer in men in the United States (after prostate, lung, and colorectal cancer and cutaneous melanoma), but it is not among the top 10 cancers in women. Accordingly, more men than women are expected to die of bladder cancer in 2026, with 12,640 deaths in men versus 5230 in women. [33]  Nevertheless, women generally have a worse prognosis than men.

The incidence of bladder cancer is almost twice as high in White men as in Black men in the United States. However, Blacks have a worse prognosis than Whites. [34]

From 2000 to 2019, incidence and death rates for bladder cancer decreased in most racial and ethnic groups in both men and women in the US. On average, incidence rates decreased by 1.88% annually in men and 1.34% in women; death rates decreased by 2.16% in men and 2.44% in women. However, incidence rates showed a steady increase in American Indian and Alaska Native men and women, and death rates stabilized in Asian American and Pacific Islander men and Hispanic women. [35]

Limited data indicate that small-cell carcinoma of the urinary bladder probably has the same epidemiologic characteristics as urothelial carcinoma. Patients are more likely to be male and older than 50 years. [36]

International occurrence

Worldwide, there were an estimated 614,298 cases of bladder cancer in 2022, with 220,596 deaths. [37] In industrialized countries, 90% of bladder cancers are urothelial carcinomas. In developing countries—particularly in the Middle East and Africa—the majority of bladder cancers are SCCs, and most of these cancers are secondary to Schistosoma haematobium infection. Urothelial carcinoma is reported to be the most common urologic cancer in China. [38]

In Africa, the highest incidence of SCC has been seen in schistosomal-endemic areas, notably Sudan and Egypt, where SCC ranges from two thirds to three quarters of all malignant tumors of the bladder. Since the turn of the century, a few studies from Egypt have shown a reversal of this trend due to the better control of schistosomiasis in the region, whereas in other parts of Africa the association is unchanged. [39, 40]  Increased smoking incidence is believed to have contributed to the shift in Egypt toward urothelial carcinoma, which has a stronger smoking association.

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Prognosis

Untreated bladder cancer produces significant morbidity, including the following:

  • Hematuria
  • Dysuria
  • Irritative urinary symptoms
  • Urinary retention
  • Urinary incontinence
  • Ureteral obstruction
  • Pelvic pain

The recurrence rate for non–muscle-invasive bladder cancer (NMIBC) is high, with as many as 40-60% of patients experiencing recurrence within 2 years. [41] However, a study of patients with grade 3 NMIBC treated with intravesical bacillus Calmette-Guérin (BCG) reported that the risk of disease progression was 6.5% at 1 year after their first BCG instillation. In patients who continued with BCG maintenance treatments, the risk of progression was 4.6% after the first BCG maintenance instillation. [42]

The 5-year relative survival rate in bladder cancer decreases with increasing stage, as follows:

  • Localized – 73.0%
  • Regional metastasis – 41.8%
  • Distant metastasis – 9.6%

Prognosis in carcinoma in situ

The 5-year relative survival for patients with CIS is 98%. [34] However, CIS in association with T1 papillary tumor carries a poorer prognosis: It has a recurrence rate of 63-92% and a rate of progression to muscle invasion of 50-75% despite intravesical BCG. Diffuse CIS is an especially ominous finding; in one study, 78% of cases progressed to muscle-invasive disease. [43]

Prognosis in squamous cell carcinoma

Tumor stage, lymph node involvement, and tumor grade have been shown to be of independent prognostic value in SCC. However, pathologic stage is the most important prognostic factor. In one relatively large series of 154 schistosomiasis-associated cases, the overall 5-year survival rate was 56% for pT1 and 68% for pT2 tumors. However, the 5-year survival rate for pT3 and pT4 tumors was only 19%. [44]

Several studies have demonstrated that grade is a significant morphologic parameter in SCC. In one series, 5-year survival rates for grade 1, 2, and 3 SCC was 62%, 52%, and 35%, respectively. In the same study of patients undergoing cystectomy, the investigators suggested that a higher number of newly formed blood vessels predicts unfavorable disease outcome. [44]

A population-based study from Ontario, Canada, identified the following as risk factors for reduced cancer-specific survival in bladder SCC [45] :

  • Age > 70 years
  • Higher T category, N-positive disease, and lymphovascular invasion
  • Positive surgical margins

Prognosis in small cell carcinoma

Patients with small cell carcinoma of the bladder usually have disease in an advanced stage at diagnosis, and they have a poor prognosis. [9] Overall median survival is only 1.7 years. The 5-year survival rates for stage II, III, and IV disease are 64%, 15%, and 11%, respectively. [46]

Recurrent bladder cancer

Bladder cancer has the highest recurrence rate of any malignancy (ie, 70% within 5 y). Although most patients with bladder cancer can be treated initially with organ-sparing therapy, most experience either recurrence or progression. The underlying genetic changes that result in a bladder tumor occur in the entire urothelium, making the whole lining of the urinary system susceptible to tumor recurrence.

Risk factors for recurrence and progression include the following [47, 48] :

  • Female sex
  • Larger tumor size
  • Multifocality
  • Larger number of tumors
  • High tumor grade
  • Advanced stage
  • Presence of CIS

The time interval to recurrence is also significant. Patients with tumor recurrences within 2 years, and especially with recurrences within 3-6 months, have an aggressive tumor and an increased risk of disease progression.

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