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Bladder cancer: management

An overview of the different types of bladder cancer, treatment options and the role of pharmacists in its management.
Article Supported By
Merck
Bladder cancer. Coloured X-ray of a large cancerous tumour

After reading this article, you should be able to:

  • Differentiate the types of bladder cancer;
  • Understand the treatment options for the most common forms of bladder cancer (transitional cell carcinoma/urothelial cancer); 
  • Be able to recognise common treatment side effects;
  • Understand the role of pharmacists in bladder cancer management.

Bladder cancer (BC) occurs when there is growth of abnormal tissue, known as a tumour, in the bladder lining. In some cases, the tumour spreads into the bladder muscle and can metastasise to distant parts of the body. There are around 10,000 new cases of BC each year in the UK (see Figure 1), which makes it the 11th most common cancer, accounting for 3% of all new cancer cases​[1–3]​.

The incidence of BC has decreased in the UK since the early 1990s by 41% in females and 47% in males, and it has decreased across the board by 16% between 2006–2008 and 2016–2018 and is anticipated to continue to decrease by a further 34% by 2035 (13 cases per 100,000 people)​[1]​

Figure 1: Bladder cancer cases and deaths in the UK​[3]​

Risk factors

Advanced age is the biggest risk factor for BC, with the highest incidence in those aged 85–89 years, and around 56% of all new cases are diagnosed in people aged over 75 years​[1]​. Data also show that BC affects twice as many males as females: 1 in 50 males and 1 in 133 females in the UK will be diagnosed with BC in their lifetime. It is also more common in white people than African, Caribbean or Asian people​[1]​.

A person’s risk of developing BC depends on many factors, including age, genetics and exposure to risk factors, including some avoidable lifestyle factors (see Figure 2). It is estimated that 49% of cases are preventable​[1]​.

Figure 2: Preventable cases and causes of bladder cancer​[1,4]​

Compared with the general population, BC risk is 1.8 times higher in people with a first degree relative who has the disease​[1,4]​. Around 980 cases of BC each year in England are linked with deprivation, with deaths more common in the most deprived areas. 

Smoking has been shown to triple the risk of BC compared to non-smokers and the risk in former smokers remains elevated for many years after quitting, even for people with moderate smoking histories​[5,6]​. Pharmacy teams should enquire on the smoking status of patients and offer them support and advice to support cessation and may find the resource ‘Pharmacy guide to smoking cessation consultations’ useful​[7]​.

Chronic inflammatory processes, such as bacterial infections, parasite infestation, having chronic indwelling catheters, or long-term use of cyclophosphamide, result in increased cellular proliferation and increase the risk of developing BC​[8]​

The spectrum of BC is diverse; however, urothelial cancers (UC) are the most common and make up 90% of all BC​[9]​. UC is derived from the cells of the bladder lining (urothelium) called transitional or urothelial cells that stretch from the bladder to the ureter, renal pelvis and renal collecting tubules​[10]​. Transitional cells come into contact with waste products in the urine that may cause cancer (e.g. chemicals from cigarette smoke or chemical industry). These chemicals increase the risk of BC by up to 50-fold, generating genetic mutations that cause the cells to change their behaviour and invade the basement membrane lying below the transitional layer (sometimes called transitional cell carcinoma [TCC] or UC)​[9]​

Cancer genomics

Around 58 genes have been identified in causing UC. High mutation burden can be of prognostic and predictive value in the era of immune checkpoint inhibition​[11]​.

The mRNA expression pattern can subdivide UC into distinct molecular subtypes, the simplest molecular classification results in luminal and basal or squamous subtypes, in addition to the neuronal subtype​[12]​.

Luminal UC tends to have a relatively good prognosis and responds better to chemotherapy. However, neuroendocrine differentiation is less common, but is a more aggressive disease with high mutational burden​[13]​.

Certain gene expressions can make the cancer either sensitive or resistant to drug treatment. Some mutations can make BC more sensitive (such as ERBB2) or resistant to cisplatin​[9,14–16]​. Some are enriched with programmed death 1 (PD-L1) T cells and are sensitive to immune checkpoint inhibitors (ICI), such as atezolizumab, pembrolizumab or avelumab​[16,17]​.

UC may also express activating FGFR3 mutations with activating ERBB2 and ERBB3 mutations allowing FGFR and ERBB drug targeting​[17]​.

UC can also enriched with epidermal growth factor receptors (EGFR) possibly susceptible to small molecule tyrosine kinase inhibitors (e.g. erdafitinib) and novel drugs that target hypoxia-inducible factor 1​[11,16]​.

Symptoms

Haematuria, either microscopic or grossly visible blood in the urine, is the most common presenting symptom of UC. It is usually intermittent, painless and presents throughout micturition. The likelihood of cancer increases when haematuria is visible (macroscopic) rather than microscopic (10–20% versus 2–5%, respectively)​[8]​

Other symptoms can include:

  • Pain (e.g. flank, suprapubic or abdominal pain);
  • Changes in daytime or nocturnal frequency, dysuria and urge incontinence (which can be signs of carcinoma in situ of the bladder);
  • Fatigue, weight loss and anorexia (usually signs of advanced or/metastatic disease)​[18]​.

As patients may present to community pharmacy with any of these symptoms, pharmacy teams should be aware of the ‘red flag’ symptoms requiring urgent referral and ensure patients consult with their GP to ensure the target to get these symptoms reviewed by a specialist within two weeks is met​[19]​.  

Diagnosis

Figure 3 outlines the diagnostic work-up for a patient with suspected BC​[2]​.

Figure 3: Diagnostic work-up for a patient with suspected bladder cancer​[2]​

While ultrasonography can identify a mass in the bladder, diagnosis requires cystoscopic examination of the bladder and histological evaluation of the tissue either by biopsy or transurethral resection of the bladder tumour (TURBT) (see Figure 4)​[2]​. Complete resection of all tumour tissue should be achieved when possible​[2]​.

Figure 4: Transurethral Resection of Bladder Tumour (TURBT)
Sources: Cancer Research UK and Macmillan Cancer Support

Presentation

BC can present as:

  • Early (superficial) cancers (non-muscle invasive bladder cancers [NMIBC]) that have not invaded the deeper layers of the bladder. Around 75% of BC presents as NMIBC, which includes stages pTa-pT1, pTis (see Table 1)​[5]​. Most patients with MIBC (pT2a-pT4b) are diagnosed with primary invasive BC, but up to 15% have a previous history of NMIBC, almost exclusively high-risk NMIBC​[5]​;
  • Those that have invaded deeper (muscle invasive bladder cancers [MIBC]) or; 
  • Metastatic disease where the cancer has spread to other parts of the body, such as lungs, liver, lymph nodes in pelvis/abdomen or bones​[22]​.

The pathological findings of a biopsy dictate the approach to management depending on the histology, grade and depth of invasion into the bladder wall (see Table 1)​[13,23–26]​.

If muscle invasion has been confirmed, regional and distant staging should be carried out with further imaging studies, such as contrast-enhanced computed tomography (CT) of the chest, abdomen and pelvis or magnetic resonance imaging (MRI) of the abdomen and pelvis, with CT of the chest​[2]​.

Table 1: Bladder cancer staging​[23–26]​

Survival

Survival rates at one, five and ten years for patients in England post-diagnosis of BC between 2013 and 2017 are shown in Figure 5​[3,15]​.

Figure 5: Survival at one, five and ten years for people in England diagnosed with bladder cancer (2013–2017)

Survival decreases with more extensive disease and ranges from 96% five-year survival for cancer in situ to 6% only when distant metastases are present​[26,27]​

Management 

Bladder confined disease or non-muscle invasive bladder cancers

Optimal management of NMIBC requires the complete removal of all visible lesions, followed by intravesical (directly into the bladder) instillations or radical cystectomy (see Figure 6)​[2]​.

Figure 6: Radical cystectomy
Sources: Cancer Research UK and Macmillan Cancer Support

Conservative management may allow preservation of a functional bladder based upon TURBT, potentially combined with adjuvant intravesical therapy (see Figure 4). Intravesical therapy is recommended (either with mitomycin C or bacillus Calmette-Guérin [BCG]) to decrease the risk of recurrence or progression to MIBC leading to cystectomy. Intravesical therapy permits high local concentrations of adjuvant within the bladder, potentially destroying viable tumour cells that remain following TURBT. 

In NMIBC, the risk of recurrence and/or disseminated disease after initial treatment is used to guide therapy. Risk stratification is based upon the European Association of Urologists (EAU) guidelines​[30]​. Risk of progression is stratified based upon tumour grade, invasion into the lamina propria, tumour size, and whether the tumour is recurrent and multifocal. This involves the staging of the BC (see Table 1). Patients are defined as ‘low’, ‘intermediate’ and ‘high’ risk (see Figure 7)​[30]​.

Some patients with clinical features suggestive of high risk for progression may have indications for initial cystectomy (e.g. unresponsive to BCG)​[31]​.

Figure 7: Management pathway for bladder cancer confined disease/non-muscle invasive bladder cancer​[32]​

Low-risk non-muscle invasive bladder cancer

Usually managed by TURBT alone plus a single dose of perioperative intravesical mitomycin C​[33]​. In a 2007 meta-analysis of two randomised trials, single-dose, post-operative instillation of chemotherapy reduced early tumour recurrence rates by 17% compared with TURBT alone​[33]​. A randomised trial in 2,243 patients compared mitomycin instillation within 24 hours versus at two weeks and demonstrated definitively that early administration is more effective​[34]​. The National Institute for Health and Care Excellence (NICE) recommends cystoscopic follow-up of patients 3 months and 12 months after diagnosis​[35]​

Intermediate risk non-muscle invasive bladder cancer

BCG, a live attenuated form of Mycobacterium bovis, and mitomycin C are widely used as an intravesical agent. 

NICE recommends a course of at least six doses of intravesical mitomycin C. Patients should be offered cystoscopic follow up at 3, 9 and 18 months, and once a year thereafter​[35]​. The activity of mitomycin with extended maintenance therapy was illustrated in a multicentre trial in which 495 patients were randomly assigned to intravesical therapy with BCG (weekly for six doses), mitomycin (20mg weekly for six weeks), or mitomycin (20mg weekly for six weeks, then maintenance [monthly] for three years). The three-year recurrence-free rates with six-week courses of either BCG or mitomycin were inferior to that achieved with maintenance mitomycin (66 and 69% versus 86%)​[36]​.

In addition to intravesical mitomycin C, European Society for Medical Oncology (ESMO) guidelines recommend BCG and state patients should receive “12 months of BCG instillation therapy (induction therapy with six BCG instillations at weekly intervals), followed by maintenance therapy with three BCG instillations each at 3, 6 and 12 months after the start of the induction cycle”​[2]​

Other intravesical agents have been compared with BCG, but most are inferior or have not consistently proved to be superior. 

A meta-analysis comparing BCG to intravesical chemotherapy showed 68.1% of patients had a complete response with BCG compared to 51.1% on chemotherapy. After 3.6 years, 46.7% of patients on BCG had no evidence of disease compared to 26.2% who had received chemotherapy​[37]​

High-risk non-muscle invasive bladder cancer

NICE and ESMO recommend that another TURBT should be offered as soon as possible and no later than six weeks after the first resection owing to a significant risk of residual disease​[2,35,38]​. ESMO recommends full-dose intravesical BCG for one to three years (at least 1 year) with three-year maintenance is more effective than 1-year to prevent recurrences​[2,39]​. Induction consists of weekly instillations for 6 weeks while maintenance consists of weekly instillations for 3 weeks and then, instillations at 3, 6, 12, 18, 24, 30 and 36 months​[2]​. The three-year maintenance BCG schedule significantly reduces the risk or recurrence compared with one-year maintenance (hazard ratio [HR] for one versus three years: 1.61; 95% CI: 1.13-2.30; P=0.01). This benefit of three-year therapy does not occur for patients with intermediate-risk tumours​[39]​.

NICE recommends that people with high-risk NMIBC undergo regular cystoscopic follow-up​[35]​

Up to 85% of patients may experience minor non-infectious symptoms including fever, malaise and bladder irritation (urination frequency, dysuria, or mild haematuria) within a few hours of BCG administration​[40,41]​.  

Treatment after bacillus Calmette-Guérin failure

Up to 40% of patients with NMIBC will fail intravesical BCG therapy and there is subsequent recurrence or progression. Stratification of these patients can identify those with a better or worse prognosis​[42,43]​

Radical cystectomy should be offered first, with further intravesical therapy offered if radical cystectomy is unsuitable or declined by the patient, or if the BC that recurs is intermediate or low risk​[35]​.  

Pembrolizumab has been approved by the FDA for BCG-unresponsive, high risk, NMIBC with CIS, with or without papillary tumours, who are ineligible for or have elected not to undergo cystectomy following publication of KEYNOTE-057​[44,45]​. KEYNOTE-057 was an open-label, single arm, phase II study that showed a complete response rate of 41% with a median duration of response of 16.2 months. However, it is not currently approved for use in the UK​[44,45]​.

Muscle invasive bladder cancers

The treatment of both MIBC and metastatic UC (outlined below) involve systemic drug treatments (e.g. cisplatin or carboplatin-based regimen or immune checkpoint inhibitors). 

Optimal management of MIBC involves complete removal of all lesions to decrease the risk of recurrence or progression to metastatic disease (see Figure 8)​[2]​.

Figure 8: Management pathway for muscle invasive bladder cancer

Platinum eligibility (cisplatin or carboplatin)

Cisplatin-based combinations are first-line treatment options for MIBC and metastatic UC; however, around 50% of patients are ineligible for cisplatin and struggle to tolerate chemotherapy. Table 2 outlines the eligibility and approach to treatment​[46]​.

Table 2: Criteria used to define platinum eligibility​[13,47,48]​

Table 2 footnote: The benefit of carboplatin-based therapy was demonstrated in patient’s glomerular filtration rate (GFR) between 30mL/min-60mL/min and/or a poor performance status (Eastern Cooperative Oncology Group [ECOG] ≥2) and this is the basis for this recommendation​[13]​. However, some centres use a lower GFR of >20mL/min as a guide to eligibility to receive carboplatin. 

Neoadjuvant is the administration of chemotherapy before either surgery (cystectomy) or radiotherapy to shrink the cancer and lower the risk of recurrence​[49]​. NICE suggests offering “neoadjuvant chemotherapy using a cisplatin combination regimen before radical cystectomy or radical radiotherapy to people with newly diagnosed muscle‑invasive urothelial bladder cancer for whom cisplatin‑based chemotherapy is suitable”​[35]​.

A 2005 meta-analysis, compared neoadjuvant cisplatin-based chemotherapy plus cystectomy with cystectomy alone and showed 5% absolute increase in five-year overall survival (OS) and 9% absolute increase in five-year disease free survival​[50]​

However, there is a lack of clarity about the optimal regimen and several studies have confirmed that GC (gemcitabine/cisplatin) and MVAC (methotrexate/vinblastine/doxorubicin [formerly adriamycin]/cisplatin) regimens show similar pathologic complete response​[51–53]​.

When muscle invasion was not present on initial biopsies before cystectomy, NICE suggests adjuvant (administered after surgery or radiotherapy) cisplatin combination chemotherapy after radical cystectomy with GC​[35,49]​

A detailed description of regimens used in UC and their common toxicities can be found in Table 3 ​[54–57]​.

Table 3: Bladder cancer regimens and toxicities​[54–57]​

Metastatic urothelial cancer 

Metastatic UC (mUC) is when the disease has spread to other parts of the body, such as the lungs, liver, lymph nodes in pelvis, abdomen or bones​[22]​. Initial management should be a cisplatin-based regimen, which demonstrates a 12–14 month OS​[58]​

Patients with mUC fall into three groups​[13]​:

  • Fit for cisplatin-based chemotherapy;
  • Fit for carboplatin-based chemotherapy (unfit for cisplatin); and 
  • Unfit for any platinum-based chemotherapy.

Figure 9 provides an outline of the management of metastatic UC and the place of each therapy. 

Figure 9: Management of metastatic UC

Patients with metastatic urothelial cancer who are fit for cisplatin-based chemotherapy

International guidelines recommend either GC or MVAC as first-line options for mUC patients fit for cisplatin-based chemotherapy​[1,20,59]​.

This is because data from several randomised studies indicate that GC and MVAC have equivalent efficacy (similar overall response rate [ORR], time to progression and OS), but GC to have less toxicity (less weight loss, better performance status, less fatigue, deaths owing to toxicity, neutropenia, neutropenic sepsis and mucositis)​[60–65]​

A randomised trial has found that a dose-dense (dd) MVAC that delivers twice the doses of cisplatin and doxorubicin in half the time was associated with an improvement in complete responses and progression-free survival and with fewer dose delays and less toxicity than MVAC​[62,63]​.

This is reflected in the guideline recommendations​[2,13]​.

Carboplatin-containing chemotherapy is not considered to be equivalent to cisplatin-based combinations and should not be considered in patients fit for cisplatin​[13]​.

Patients with metastatic urothelial cancer who are ineligible for cisplatin-based regimens

An analysis of four randomised phase II trials of carboplatin versus cisplatin combination chemotherapy showed lower complete response rates and shorter OS for the carboplatin arms​[64]​. A multicentre, retrospective study (n=1,333) showed that eligible patients treated with cisplatin lived longer than those who were not and highlighted the importance of using cisplatin in eligible patients to improve survival​[65]​. It is important to therefore determine the basis for renal impairment before selecting a regimen and if there is a simple or reversible cause (e.g. urinary obstruction) that this is corrected to allow use of dd-MVAC or GC regimens.

The evidence for gemcitabine-carboplatin-based regimens (Gem-Carbo) comes from the European Organisation for Research and Treatment of Cancer (EORTC) trial 30986, which included patients that had impaired renal function (GFR >30mL/min to <60mL/min) and/or a poor performance status (ECOG ≥2)​[66]​. At 4.5 years follow-up Gem-Carbo had similar ORR, median OS and median progression-free survival (PFS) compared to a regimen containing methotrexate/carboplatin/vinblastine (M-CAVI)​[66]​.

Gem-Carbo caused less serious toxicities, such as neutropenia and febrile neutropenia​[67]​.

Maintenance avelumab (an ICI) following initial platinum-based chemotherapy in mUC has been licensed following the JAVELIN-Bladder-100​[67,68]​. The use of maintenance avelumab in locally advanced unresectable or mUC (irrelevant of PD-L1 tumour expression) with either complete response or partial response or stable disease after four to six cycles of gemcitabine plus platinum-based chemotherapy provides an additional median OS of ten months​[67]​.

Maintenance avelumab treatment of locally advanced or metastatic urothelial cancer that has not progressed after platinum-based chemotherapy is now recommended by international guidelines, with NICE recommending this indication provided it is stopped at five years of uninterrupted treatment or earlier if the disease progresses​[1,20,59,69]​.

Patients with metastatic urothelial cancer who are unfit for any platinum-based chemotherapy 

Gemcitabine and paclitaxel have been studied as first-line treatment for mUC patients unfit for any platinum-based chemotherapy with reported ORR between 38% and 60% but have never been tested in randomised trials​[70–72]​.

ICIs (atezolizumab and pembrolizumab) are licensed for monotherapy in mUC who are ineligible for cisplatin-containing chemotherapy and whose tumour expresses PD-L1​[73,74]​

Two phase II, non-comparator studies, IMvigor210 and KEYNOTE-052 investigated atezolizumab and pembrolizumab respectively with the ORR between 23% and 29% and complete response 7% and 9%​[75–77]​.

NICE recommends atezolizumab for untreated PD-L1-positive mUC when cisplatin is unsuitable, but in 2021 NICE issued a termination notice for pembrolizumab​[78,79]​.

Three trials IMvigor 130 (atezolizumab), KEYNOTE-361 (pembrolizumab) and DANUBE (duravlumab) included an ICI alone arm​[80–82]​. No PFS or OS benefit was offered by single agent ICI compared with platinum-based chemotherapy; therefore, Gem-Carbo is the preferred treatment for patients ineligible for cisplatin but eligible for carboplatin.

Second-line management of metastatic urothelial cancer

It is reasonable to rechallenge in platinum-sensitive patients if progression occurred at least 6–12 months after first-line platinum-based chemotherapy​[20]​. NICE recommend atezolizumab, provided it is stopped at two years of uninterrupted treatment or earlier if the disease progresses​[83]​. NICE does not recommend pembrolizumab or nivolumab​[84,85]​.

KEYNOTE-045 (pembrolizumab) and IMvigor211 (atezolizumab) are the only ICI phase III trials on second-line treatment​[86–90]​.

KEYNOTE-045 demonstrated that pembrolizumab compared to chemotherapy (paclitaxel, docetaxel, or vinflunine) prolonged survival whereas IMvigor211 demonstrated that atezolizumab did not prolong survival​[86,89]​

While atezolizumab is both licensed and NICE approved in the UK, its US Food and Drug Administration (FDA) approval was withdrawn after the publication of IMvigor-211​[73,83]​.

International guidelines recommend pembrolizumab over atezolizumab as the preferred standard of care immunotherapy in the second-line setting; however, this conflicts with the NICE approval of atezolizumab only​[1,13,59]​.

There are several subsequent-lines of management for mUC that are yet to be approved in the UK. These include:

Enfortumab — an antibody drug conjugate (ADC) targeting Nectin-4 which is involved in tumour-cell growth and proliferation and adheres to cell adhesion molecule that is overexpressed in UC​[13]​. Enfortumab when compared with single-agent chemotherapy after prior platinum chemotherapy and ICI and showed an increase in median overall survival (13 months compared to 9 months)​[91]​. The most common treatment-related adverse events include alopecia (45%), peripheral neuropathy (34%), fatigue (31%, 7.4% grade ≥3), decreased appetite (31%), diarrhoea (24%), nausea (23%) and skin rash (16%, 7.4% grade ≥3).

Sacituzumab govitecan — another ADC that consists of a humanised monoclonal antibody targeting trophoblast cell surface antigen 2 (Trop-2) conjugated to SN-38, the active metabolite of irinotecan​[13]​. The phase II TROPHY-U-01 study, administered sacituzumab govitecan to patients pre-treated with platinum-regimen and ICI found that 77% had a decrease in measurable disease with serious side effects: neutropenia (34%), febrile neutropenia (10%), fatigue (52%), alopecia (47%), nausea (60%), diarrhoea (10%), and decreased appetite (36%)​[92]​

Fibroblast growth factor receptor (FGFR) alteration was discovered during genomic profiling of UC (11). In 2019, the FDA approved erdafitinib, a pan-FGFR tyrosine kinase inhibitor, for mUC with susceptible FGFR2/3 alterations following platinum-containing chemotherapy including within 12 months of neoadjuvant or adjuvant platinum-containing chemotherapy​[93]​. This was based on a phase II study that showed ORR 40% (complete response 3% and 37% partial response) and ORR in those who received an immunotherapy 59%​[94]​

Enfortumab has recently been approved in Europe and the US while sacituzumab govitecan (97) and erdafitinib (57) has been approved in the United States​[57,95–97]​.

As all pharmacy teams may be a point of contact for cancer patients with potential life-threatening adverse events from treatments, it is therefore important to be able to recognise common adverse events including:

  • Immune-mediated adverse events: can be severe or fatal, can occur in any organ system or tissue (see Figure 10)​[55]​;
  • Chemotherapy adverse events: neutropenia, neutropenic sepsis, nephrotoxicity, nausea and vomiting. 

It is important that the patient urgently discusses potential adverse events and issues with the cancer team and should be referred to their oncology service for urgent advice. All services should run helplines that are easily accessed by patients.

Figure 10: The most common immune-related adverse events, their presentation and management

A detailed description of regimens used in UC and their common toxicities can be found in Table 3.

Summary

An improved understanding of the genetics of UC has changed the way metastatic disease is treated. Intravesical BCG has remained the mainstay of therapy for intermediate and high-risk non–muscle-invasive bladder cancer, the therapeutic options for muscle-invasive and advanced disease are expanding to include immunotherapy with checkpoint inhibitors, targeted therapies, and antibody-drug conjugate.

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This article has been peer reviewed by relevant subject experts prior to acceptance for publication. The reviewers declared no relevant affiliations or financial involvement with any organisation or entity with a financial involvement with any organisation or entity with a financial interest in or in financial conflict with the subject matter or materials discussed in this article.
Citation
The Pharmaceutical Journal, PJ, May 2022, Vol 308, No 7961;308(7961)::DOI:10.1211/PJ.2022.1.136984

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