CME - Frequently Asked Questions in Improving Detection and Initial Treatment of Bladder Cancer

Presented by the Warren Alpert Medical School of Brown University, Office of Continuing Medical Education.

Target Audience

This activity is designed for urologists and other healthcare professionals interested in or involved with the management of bladder cancer.

Educational Objectives

Upon completion of this activity, participants should be able to:

  • Discuss the epidemiology of bladder cancer including prevalence, mortality, and risk factors
  • Describe the economic impact of bladder cancer and how improved techniques for initial detection and at the time of transurethral resection of bladder tumor (TURBT) may decrease the economic burden
  • Compare and contrast new urine biomarkers when compared to urine cytology
  • Discuss the role of photodynamic diagnosis using hexaminolevulinate-guided fluorescence cystoscopy in detecting carcinoma in situ and residual disease at the time of TURBT compared to traditional white-light cystoscopy (WLC)
  • Optimize use of intravesical therapy after TURBT to prevent recurrence of bladder cancer and treat patients who do not respond to bacillus Calmette-Guérin (BCG) therapy
  • Discuss potential future treatment methods for patients with bladder cancer

Faculty

Pamela I. Ellsworth, MD, FACS, Program Chair

Associate Professor of Surgery

Division of Urology

The Warren Alpert Medical School of Brown University

Providence, Rhode Island

 

Muhammad Choudhury, MD, FACS

Professor and Chairman

Department of Urology

New York Medical College

Valhalla, New York

Support Acknowledgement

This activity is supported by educational grants from ENDO Pharmaceuticals and GE Healthcare.  

Faculty Disclosures

In accordance with the disclosure policy of the Warren Alpert Medical School of Brown University as well as standards set forth by the Accreditation Council for Continuing Medical Education, all speakers and individuals in a position to control the content of a CME activity are required to disclose relevant financial relationships with commercial interests (within the past 12 months). Disclosures of this activity’s speakers and planning committee have been reviewed and all identified conflicts of interest, if applicable, have been resolved. 

Pamela I. Ellsworth, MD, is a consultant for Allergan, Inc. and Pfizer Inc; she is a speaker for Pfizer Inc; she has participated in speaker training for Novartis Pharmaceuticals Corporation; and she has participated in clinical research studies sponsored by Novartis Pharmaceuticals Corporation and Pfizer Inc. 

Muhammad Choudhury, MD, has disclosed no relevant financial relationships. He does intend to discuss off-label uses of drugs, mechanical devices, biologics, or diagnostics approved by the FDA for use in the United States in his presentation.

Accreditation Statement

This activity has been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the Warren Alpert Medical School of Brown University and Health and Wellness Education Partners. The Alpert Medical School is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians.  

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The Alpert Medical School designates this enduring material for a maximum of 1.5 AMA PRA Category 1 Credits™. Physicians should only claim credit commensurate with the extent of their participation in the activity.  

AAPA Credit

AAPA accepts certificates of participation for educational activities certified for Category 1 credit from AOACCME, prescribed credit from AAFP, and AMA PRA Category 1.5 Credits™ from organizations accredited by ACCME or a recognized state medical society. Physician assistants may receive a maximum of 1.5 hour of Category 1 credit for completing this program.  

Program Release: September 1, 2011

Program Expiration: September 30, 2012

Estimated time to complete: 90 minutes

There are no prerequisites for participation.

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Introduction

As the fourth most common malignancy in the United States, bladder cancer results in nearly 15,000 deaths annually. Bladder cancer has the highest lifetime treatment costs per patient of all cancers, followed by colorectal, breast, prostate, and lung cancers. The tremendous human, psychological, and economic burden that follow a bladder cancer diagnosis underscores the importance of optimizing diagnostic and treatment protocols.

In this expert interview, UroToday® faculty experts—Pamela I. Ellsworth, MD, FACS, and Muhammad Choudhury, MD, FACS—will address some questions and challenges regarding the detection and initial treatment of bladder cancer.


Q1

UroToday: How common is bladder cancer? What are the trends in incidence and mortality of bladder cancer?

Bladder cancer is a common malignancy affecting both men and women, but men more commonly. In US men, bladder cancer is the fourth most common cancer and ranks eighth among cancer-related causes of death (Figure 1) [1]. It has been estimated that in 2011 there will be 52,020 new cases of bladder cancer in men and 17,230 new cases in women. In addition, nearly 15,000 deaths related to bladder cancer will occur in men and women in 2011 [2]. Based on rates from 2005 to 2007, the lifetime risk for being diagnosed with bladder cancer among men and women born today is 2.39%; 1.17% of men will develop bladder cancer between 50 and 70 years of age compared to 0.34% of women [3].

Figure 1. Leading Sites of New Cancer Cases and Deaths—2011 Estimates [1]  Enlarge Image

American Cancer Society. Cancer Facts and Figures 2011. Atlanta: American Cancer Society, Inc. 

Surveillance Epidemiology and End Results (SEER) incidence data from 2004 to 2008 demonstrated that the median age at diagnosis for bladder cancer was 73 years, and white men and women had a higher incidence compared with black, Asian/Pacific Islander, American Indian/Alaska Native, and Hispanic men and women [2]. Similarly, death rates by race were higher among white men; however, black women had a higher death rate than white women (2.7/100,000 vs 2.2/100,000). Bladder cancer incidence declined in women from 2004 to 2008, although there has been no change in the bladder cancer rate among men from 1986 to 2008. There appears to be a decrease in the mortality trend for both men and women from 1977 to 2007 [2].


Q2

UroToday: Bladder cancer management is known to be highly resource intensive. Will new techniques in bladder cancer detection and initial treatment impact the serious economic impact of bladder cancer?

Bladder cancer is associated with the highest lifetime treatment cost per patient of all cancers, followed by colorectal, breast, and lung cancer [3,4]. Bladder cancer also has the fifth highest overall cost, estimated at 3.4 billion dollars annually with 2.9 billion related to direct treatment-related costs per patient [4,5]. Avritscher and colleagues estimated that the lifetime mean treatment cost was $99,270 for muscle-invasive bladder cancer (MIBC) patients and $120,684 for non-muscle-invasive bladder cancer (NMIBC) patients [6]. The annual average of hospitalization days per year for patients with MIBC is more than 27 times higher than for patients with NMIBC (36 vs 1.3 days, respectively) [6]. In this study, the mean cost of bladder cancer was $65,158; 50% of the total cost ($32,559) was attributable to admissions and surgical procedures, whereas surveillance for and treatment of local recurrences accounted for 60% ($39,393). Also, 30% of the total cost ($19,811) was related to treatment of complications, 26% ($16,934) for MIBC, and 4% ($2312) for NMIBC [4,6].

The economic impact of disease progression is also significant. Treatment costs for patients with MIBC are nearly 3 times those for patients with stage Tis/Ta, and twice those for patients with T1 bladder cancer [4].

Several strategies have been proposed for reducing the economic burden of bladder cancer:

  • Use of urine-based markers to identify incident or recurrent tumors earlier [7];
  • Use of outpatient facilities for transurethral resection of bladder tumor (TURBT) reducing hospitalizations if surgical risks can be minimized [7]; and
  • Improvement in the efficacy of intravesical treatments.

In addition, photodynamic diagnosis (PDD) has been proposed as a tool to improve the efficacy of initial TURBT and potentially decrease the residual risk for NMIBC [4,8,9]. TURBT is the largest bladder cancer expenditure and accounts for 71% of treatment costs in the United Kindgom [7]. The quality and result of the initial TURBT can have a significant effect on the bladder cancer patient’s overall prognosis and treatment costs. Several studies have concluded that the use of PDD can help to reduce the cost of bladder cancer treatment.

Daniltchenko and colleagues hypothesized that the initial PDD costs can be offset by a reduction in the number of TURBT follow-up visits [10]. In a prospective series of 115 patients without adjuvant treatment, recurrence rates after 5 years were 50% after PDD and 75% after white-light cystoscopy (WLC). It was estimated that, over a 5-year period, use of PDD avoided at least 20 additional TURBTs. The authors concluded that the benefits of PDD outweighed the initial costs [10]. Similarly, 2 European studies have demonstrated an economic benefit with use of PDD. Malmstrom and colleagues concluded that use of PDD in high-risk patients could save as much as 500,000 euros ($665,000) in the first year alone. Further, if PDD were used for all TURBTs in high- and medium-risk patients, the first year savings would be approximately 450,000 euros ($536,650) and 363,000 euros ($482,790), respectively [11]. A German study also demonstrated that PDD significantly reduces costs related to recurrent NMIBC [12].

Early detection of incident and recurrent disease has a key role in decreasing the risk and cost of disease progression [4]. Currently, WLC is the primary approach for diagnosis and surveillance of bladder cancer. It is estimated, however, that 10% to 20% of bladder tumors are missed during WLC [13]. Urine cytology might help with detection of bladder cancer; however, it lacks the immediate result warranted during TUR. Emerging technologies such as PDD and adjuvant intravesical therapies including mitomycin C and bacillus Calmette-Guérin (BCG) may help to improve the diagnosis of bladder cancer and decrease the risk for recurrence and progression [4].


Q3

UroToday: Although cystoscopy is the “gold standard” for the detection of bladder cancer, it is costly and invasive. What are the advantages and disadvantages of various urine markers for diagnosing or monitoring bladder cancer?

Flexible cystoscopy remains the primary diagnostic tool for detecting bladder cancer because it confers a low risk for infection and injury, causes minimal discomfort, and can be performed routinely in the physician’s office under local anesthesia. However, the procedure provokes anxiety in many patients, visibility can be reduced by bleeding, and small tumor and flat lesion (eg, carcinoma in situ) can be difficult to distinguish from normal tissue [14,15]. For these reasons, use of adjunctive urine tumor markers as in urine cytology can assist in identifying occult cancer. Cytology is used commonly to monitor tumor recurrence in patients with a previous diagnosis of bladder cancer, in the initial assessment of patients who present with hematuria or irritative voiding symptoms to rule out (or in) bladder tumor, and following TURBT to assess the adequacy of treatment [16]. Unfortunately, the usefulness of urine cytology is limited by its low sensitivity especially in low-grade NMIBC [17].

In recent years, numerous urine-based biomarkers have been evaluated to determine whether these tests can complement or replace the existing “gold standard” cystoscopy and urine cytology in monitoring patients at risk for recurrent bladder cancer.

An ideal biomarker for urothelial cancer should have high sensitivity and specificity and should be based on a voided urine specimen, cost effective, easy to interpret, and available as a point-of-care test. 

URINE BIOMARKERS

The biomarkers shown in Table 1 are FDA approved and available for clinical use. A brief review of the molecular basis for the test, published results, and the advantages and disadvantages of each test is provided.

 

Table 1. Current FDA-Approved and Commercially Available Bladder Tumor Markers

 

Marker

Target

Point of Care

Comment

BTA stat®

Complement factor H–related protein

Yes

  • Low specificity among patients with benign urologic conditions

BTA TRAK® Assay

Complement factor H–related protein

No

  • Same as BTA stat (above)

FISH

Chromosomes 3, 7, 17, and 9p 21

No

  • High specificity
  • May predict tumor recurrence before cytologic abnormalities appear
  • Sensitivity unclear

ImmunoCyt™

Sulfated cellular mucin glycoprotein and glycosylated carcinoembryonic antigen

No

  • Low specificity compared to cytology
  • Difficult to interpret

NMP22® BladderChek® Test

Nuclear matrix protein

Yes

  • Low specificity compared to cytology
  • Hematuria and pyuria lead to
    false-positive results

 

FISH, fluorescent in situ hybridization.

 

Nuclear Matrix Protein 22 (NMP22)

Nuclear matrix proteins (NMPs)are part of the mitotic apparatus of the cell, which consists of a 3-dimensional web of RNA and protein that supports the nuclear shape; organizes DNA; and coordinates DNA replication, transportation, and gene expression [18,19]. NMP22 may be present at up to 25-fold higher concentration in tumor cells than in normal urothelial cells [20,21]. NMP22 is released from the nuclei of the tumor cell during apoptosis into the urine and the level can be measured at point of care.

Advantages

In a 15-study meta-analysis, the reported sensitivity of NMP22 was 73%, compared with 34% for urine cytology [22]. Other studies have reported estimated sensitivity of NMP22 ranging from 32% to 100% when the test was used alone or in conjunction with urine cytology for surveillance of bladder tumor [23]. Overall, NMP22 has a higher sensitivity than urine cytology especially in the detection of low-grade and low-stage bladder tumors.

The point-of-care NMP22® BladderChek® test has shown sensitivities ranging from 40% to 90% [24,25,26,27,28]. In addition, the point-of-care test does not require expert analysis or laboratory time, is not dependent on intact cells, and provides unambiguous results [24].

Disadvantages

The same studies point out the lower specificity of NMP22 when compared with urine cytology. The median specificity in a meta-analysis was 80% compared to 99% for cytology [22]. Major sources of false positive results with NMP22 are related to hematuria and pyuria common with many benign urologic conditions [29].

Multitarget Multicolor FISH Assay

Chromosomal abnormalities in urothelial tumors can be detected by fluorescent in situ hybridization (FISH) using DNA probes to chromosome centromeres or unique loci that are altered in tumor cells [30].

The Vysis® UroVysion test is a multi-target, multicolored FISH assay that uses probes to identify aneuploidy of chromosomes 3, 7, and 17, combined with a probe to the 9p21 locus. This combination of probes has been shown to have the best sensitivity and specificity [31].

Advantages

Most studies report high specificity with the Vysis UroVysion test, ranging between 75% and 100%, which is comparable to cytology [30,32,33,34,35,36,37]. The test appears to maintain its high specificity among patients with a variety of benign urology conditions including microhematuria, benign prostatic hyperplasia (BPH), infection, and inflammation [34,38,39].

The test may also be able to predict tumor recurrence before urinary cytology. Skacel and colleagues reported that 8 of 9 patients with positive FISH test, atypical cytology, and negative bladder biopsy had biopsy-proven recurrence of bladder cancer within 12 months [40].

Overall, the specificity of urine FISH test is high and comparable to that of cytology. FISH testing may also predict tumor recurrence before cytology becomes abnormal. Thus, it may prove useful in surveillance for recurrent tumor in patients with normal cytology. The test can also be used as a confirmatory test for patients with atypical cytology.

Disadvantages

Most recent studies have reported sensitivity of the Vysis UroVysion test in the range of 30% to 86% [32,41,42,43]. The assay has increased sensitivity for detecting higher grade and higher stage tumors, however, the sensitivity for detecting lower grade tumors is not clear [30]. Lack of consensus on the criteria used to evaluate abnormal urothelial cells, relatively high cost and the need for specialized laboratory to perform the test are other drawbacks.

ImmunoCyt

The ImmunoCyt™ test is a combination of cytology and immunofluorescent assay. Using monoclonal antibodies, the test detects tumor-associated antigens that are present in urothelial carcinoma. Two fluorescent labeled monoclonal antibodies are targeted at mucin antigens expressed on most bladder cancer cells but not on normal transitional epithelial cells. A third probe detects a glycosylated form of high molecular carcinoembryonic antigen that is present in bladder cancer cells [44,45].

Advantages

The ImmunoCyt test for bladder tumor has a reported sensitivity of 67% to 100% for all tumors, which is an improvement over conventional cytology [30,44,45,46,47,48,49,50]. One of the 3 antibodies used in this test appears to be quite sensitive for low-grade tumor cells and thus may offer an important advantage for detecting low-grade tumors [30].

Disadvantages

The main drawback of the ImmunoCyt test is its low specificity—63% compared with 97% for cytology and 90% for Vysis UroVysion [30]. Moreover, the interpretation of the test may be difficult for many cytologists, and false-positive results have been reported in patients with urinary tract obstruction secondary to stone or BPH. 

Bladder Tumor Antigen (BTA)

The qualitative point-of-care test BTA stat® and the quantitative BTA-TRAK assays detect human complement factor H–related protein. BTA stat is an immunoassay that can be performed in 5 minutes, whereas BTA TRAK® is a standard enzyme-linked immunosorbent assay (ELISA) that quantitatively measures the amount of complement factor H–related protein and complement factor H in urine [51].

Advantages

The overall sensitivity of BTA testing ranges from 9.3% to as high as 89%, with higher sensitivity in higher-grade tumors [38,52,53,54,55,56]. BTA stat also has the advantage of being a point-of-care test. 

Disadvantages

The BTA stat has low specificity (approximately 50%) among patients with urinary tract infections, urinary calculi, nephritis, cystitis, BPH, hematuria and proteinuria [55,57,58,59]. The low specificity in these conditions is secondary to the test’s ability to detect both complement factor H–related protein and complement factor H. Complement factor H is present in human serum at high concentrations and therefore BTA stat testing may be falsely positive in benign, hematuria-causing conditions [19]

Markers Under Investigation

A number of biomarkers are under investigation and have not yet received FDA approval. A selection of these biomarkers is described in Table 2.

Table 2. Biomarkers Under Investigation

In summary, review of data on urine biomarkers for the detection of bladder cancer reveals that several have higher sensitivity than cytology, but most of these markers have lower specificity than cytology. An ideal biomarker must have both high sensitivity and high specificity. Unfortunately, none of these biomarkers meets this standard currently. Some biomarkers can be used to complement the present gold standard of cystoscopy and urine cytology, but none is ready to replace them. 


Q4

UroToday: What is hexaminolevulinate-guided fluorescence cystoscopy? What is its role in the evaluation of bladder cancer?

The rationale for the use of photosensitizing drugs is based on the preferential accumulation of a photosensitizing compound in cancer cells. This compound emits fluorescence in the red part of the spectrum under blue-violet excitation or illumination and enhances detection of the tumor. The first prodrug used for this purpose was 5-aminolevulinic acid (5-ALA). Although 5-ALA itself has no photochemical activity, it induces the formation of endogenous photoactive porphyrins. Protoporphyrin IX is a photoactive derivative of ALA. Hexaminolevulinic acid (HAL) is a more potent ester of aminolevulinic acid that provides better selectivity, brighter fluorescence, and permits a shorter instillation time [70].

Hexaminolevulinate was approved the FDA on May 28, 2010, for the detection of NMIBC or suspected bladder cancer. Fluorescence-guided biopsy and resection have been confirmed as more sensitive than conventional procedures in detecting malignant tumor, particularly CIS [71,72,73].

Technique

The Cysview kit contains a 10 mL vial of 100 mg powder of hexaminolevulinate and a 50 mL vial of diluent [74]. The reconstituted solution is administered intravesically and retained for 1 hour. Standard WLC (Figure 2a) and blue light cystoscopy (Figure 2b) using a D-light cystoscope (Karl Storz, Germany) is then performed. 

Figure 2a. Cystoscopic Examination With White Light

Figure 2b. Cystoscopic Examination With Blue Light

Images courtesy of Priv. Doz. Dr. med. Maximilian Burger Oberarzt, Klinik für Urologie der Universität Regensburg am Caritas- Krankenhaus St. Josef. Provided via GE Healthcare.

Hexaminolevulinate should not be used in patients with porphyria, gross hematuria, BCG immunotherapy or intravesical chemotherapy within the past 90 days, or a known hypersensitivity to HAL or ALA derivatives. Caution should be used in administering hexaminolevulinate to pregnant women and nursing mothers as there is no human or animal data available regarding its use in these populations. The safety and efficacy of hexaminolevulinate has not been established in pediatric patients [74].

Side effects of hexaminolevulinate are infrequent and most commonly minor in severity. The most common adverse effect was bladder spasm occurring in < 3% of patients and dysuria, hematuria, bladder pain, procedural pain, urinary retention and headache, all occurring in ≤ 2% patients. False fluorescence may occur due to inflammation, cystoscopic trauma, scar tissue or previous bladder biopsy [74]

Efficacy

Efficacy of PDD is evaluated by (1) detection of tumors and subsequent resection and (2) tumor recurrence. In a review of the literature, Witjes and colleagues concluded that HAL PDD provides considerable benefits versus WLC in the detection of NMIBC [75]. Furthermore, the benefits are most pronounced for CIS. The ability to detect CIS is approximately 28% greater with the addition of HAL PDD added to WLC compared to WLC alone [71]. Jocham and colleagues demonstrated the clinical benefit of an improved tumor detection rate. In their prospective, phase 3 multicenter study they found that PDD resulted in more complete treatment in 17% of patients (P < .0001) [76]. Mowatt and colleagues performed a systematic review of the effectiveness of PDD at the time of primary TURBT and noted that PDD enhances more complete resection rates and as a result prolongs recurrence-free survival compared with WLC [77]. In 3 trials evaluating tumor-free recurrence rates, PDD was associated with fewer recurrences, and the recurrence-free survival rate was 15.8% to 27% higher at 12 months and 12% to 15% higher at 24 months in the PDD groups than in the WLC-only groups [78,79,80].

Outpatient cystoscopy is typically performed with flexible cystoscopes. Data on the efficacy of PDD has been based on rigid cystoscopy. Loidl and colleagues performed a prospective controlled, within-patient comparison of flexible HAL cystoscopy with standard flexible cystoscopy, HAL rigid and standard white-light rigid cystoscopy. In the 45 patients studied 41 (91%) had exophytic tumors, of which 29 (95.1%) were detected by HAL flexible cystoscopy and 40 (97.5%) by HAL rigid cystoscopy. Seventeen (38%) patients had concomitant or CIS only; of these patients, CIS was identified by HAL flexible cystoscopy in 14 (82.3%), HAL rigid cystoscopy in 15 (88.2%), flexible WLC in 11 (64.7%), and rigid WLC in 13 (76.7%). Thus, HAL flexible cystoscopy was superior to WLC and comparable to HAL rigid cystoscopy in detecting papillary and flat lesions in bladder cancer patients [81].


Q5:

UroToday: What is the role of intravesical therapy after TURBT in the management of bladder cancer? What are current and emerging agents being used in intravesical therapy after TURBT?

Although TURBT is the gold standard for the initial diagnosis and treatment of NMIBC, intravesical therapy has become an integral component in the management of NMIBC [82].

Intravesical therapy is used to reduce and/or delay the risk for recurrence [83,84,85,86,87,88], prevent progression of disease, and as adjunctive therapy in Tis where diffuse tumor prevent complete tumor resection [89,90]. Most of the commonly used intravesical therapies for NMIBC can be categorized in 2 groups, immunomodulatory agents and chemotherapeutic agents, primarily based on their mechanism of action. Table 3 describes the mechanism of action and dosing for commonly used immunotherapeutic and chemotherapeutic agents. 

Table 3. Intravesical Therapy

 

Selection of an agent for intravesical therapy is dictated by the risk for recurrence and progression in an individual patient. For tumors with a high risk for recurrence but low risk for progression (i.e., multiple recurrent Ta G1 tumors), either intravesical chemotherapy or BCG might be given [91]. For other tumors that have a high risk for recurrence and progression (i.e., multiple recurrent T1 G3 tumors), intravesical BCG with maintenance BCG therapy might be initiated.

Treatment guidelines have been published on risk stratification for the management of NMIBC [92,93,94,95,96]. The International Bladder Cancer Group (IBCG) developed treatment algorithms for the management of patients with low-, intermediate-, and high-risk NMIBC (Figures 3-5) [97].

Figure 3. Algorithm for the Treatment and Management of Low-Risk NMIBC

*Except in those with overt or suspected bladder wall perforation. 

†Decision should be based on multifocality, size, grade, and stage.

Lamm DL. Oncology. 1995;9:947-952.


Figure 4. Algorithm for the Treatment and Management of Intermediate-Risk NMIBC

*Except in patients with overt or suspected bladder wall perforation.

†Decision should be based on grade, stage, size of tumor, and multifocality.

Lamm DL. Oncology. 1995;9:947-952.


Figure 3. Algorithm for the Treatment and Management of High-Risk NMIBC

 

Lamm DL. Oncology. 1995;9:947-952.

 

Immunotherapeutic Agents

BCG

BCG, a live, attenuated strain of mycobacterium bovis, is widely used as an intravesical immunotherapy against NMIBC since the 1970s. BCG is the first-line treatment for CIS and has been shown to be effective as prophylaxis to prevent recurrence following TURBT [98,99,100,101].

Initiation of intravesical BCG therapy is usually delayed for 2 to 3 weeks following TURBT to allow for healing of the urothelium and thereby decrease the risk for systemic side effects. Meta-analysis suggests that maintenance BCG therapy should be administered [92], but the optimal schedule and duration of therapy is not well-defined. The best available evidence, however, supports the use of the SWOG regimen comprising a 6-week induction cycle followed by a 3-week maintenance course at 3, 6, 12, 18, 24, 30, and 36 months, if tolerated by the patient [92,102].

Interferon

Recombinant interferon alpha-2b has been used as monotherapy and in combination with low-dose BCG therapy to treat patients with NMIBC [103,104,105,106]. Phase 2 trials have suggested durable response in both BCG-naïve and BCG-refractory patients, but long-term randomized trials have yet to be conducted to validate the results [92].

Chemotherapeutic Agents

Thiotepa

Thiotepa (triethylenethiophosphoramide) is an alkylating agent. Introduced in 1961, thiotepa is the oldest and one of the least expensive of the intravesical agents. The usual regimen consists of 6 to 8 weekly instillations followed by monthly instillations for 1 year [92]. Absorption though the urothelium may lead to systemic side effects—specifically myelosuppression—thus, monitoring of leukocyte and platelet count is needed before each instillation, and treatment should be delayed, if necessary. 

Mitomycin C

Mitomycin C is an antibiotic that inhibits DNA synthesis. Myelosuppression and other systemic side effects are rare. Meta-analysis by the AUA guidelines panel have demonstrated a relative recurrence risk reduction of 17% with a single perioperative dose of mitomycin C in patients with NMIBC with both low- and high-risk features [85,92]. Perioperative mitomycin C should not be administered to patients with a known or suspected bladder perforation following TURBT. 

Intercalating Agents (Doxorubicin, Epirubicin, and Valrubicin)

Doxorubicin is an anthracycline derivative. Absorption from the bladder and systemic toxicities are extremely rare following intravesical therapy.

Epirubicin is not currently available in the United States. 

Valrubicin, a semisynthetic analogue of doxorubicin, is approved by the US FDA for intravesical therapy of BCG-refractory CIS of the bladder. Upon intravesical administration, valrubicin rapidly traverse cell membranes and accumulates in the cytoplasm, where it interferes with the incorporation of nucleoside into the nucleic acids, resulting in chromosomal damage and cell cycle arrest in G2 [107]. The metabolites of valrubicin also inhibit DNA synthesis. The response rate with intravesical valrubicin in patients with BCG-refractory CIS of the bladder is modest (18%) [108]. Thus, valrubicin is used in patients who refuse or are unfit for cystectomy. 

Newer Approaches

Gemcitabine

The chemotherapeutic agent gemcitabine is an antimetabolite analog of the nucleoside pyrimidine. Intravesical gemcitabine has been shown to have activity in NMIBC [109,110,111,112]. A recent randomized prospective study comparing intravesical BCG versus gemcitabine in high-risk superficial bladder cancer demonstrated that gemcitabine is significantly inferior to BCG. At a median followup of 44 months, the recurrence rate in patients treated with BCG was 28.1%, compared to 53% in patients who received gemcitabine (P = .037) [113]. Gemcitabine may be useful in patients intolerant to or otherwise unable to receive BCG. 

A phase 2 trial of intravesical gemcitabine in 30 patients with BCG refractory/intolerant disease who refused cystectomy, showed a 50% complete response (95% CI, 32, 68), and one year recurrence-free survival rate of patients with CR was 21% (95% CI, 0, 43) [111]. 

Docetaxel

Docetaxel is a microtubule, depolymerization inhibitor with antitumor activity. In a dose escalation study 18 patients were treated. Ten (56%) of 18 patients had no evidence of disease at their post-treatment cystoscopy and biopsy [114]. Intravesical docetaxel appeared to be safe and well tolerated. Further studies and long term follow-up is needed. 

Other Emerging Agents

Other emerging agents include nab-paclitaxel, UrocidinTM, and apaziquone. Nab-paclitaxel is a novel agent in the taxane family that has been modified with the addition of albumin particles to form nanoparticles to increase solubility and facilitate drug delivery to tumor cells via biological interaction with albumin receptors that mediate drug transport across epithelial cells. In a phase 1 trial of 18 patients with BCG-refractory NMIBC using intravesical nab-paclitaxel, 5 patients (28%) had no evidence of disease at posttreatment cystoscopy [115]

Urocidin, a mycobacterial cell wall-DNA complex (MCC) formulation, that acts dually to stimulate immunity and has direct anticancer activity, is also being studied as a treatment for patients with bladder cancer. A recent Phase 3 trial demonstrated efficacy and safety of MCC in patients with NMIBC who were refractory to intravesical BCG therapy and at high risk of progression [116]

Apaziquone is another promising future therapy for the treatment of NMIBC. In a study that included 46 patients who had previously failed multiple therapies, apaziquone produced a 67% complete response and was well tolerated. Local side effects were comparable to side effects associated with other chemotherapy instillations [117].  

Role of Intravesical Therapy in NMIBC

Role of immediate, postoperative, single-dose instillation of intravesical chemotherapy following TURBT.

A single, immediate instillation of intravesical mitomycin C following TURBT significantly reduces the risk for recurrence by 17% (95% CI, -28, -8%) when compared to TURBT alone [92].

Meta-analysis by the European Organization for the Research & Treatment of Cancer (EORTC) showed an absolute risk reduction of 12% with the use of a single, immediate post operative (within 24 hours) instillation of a chemotherapeutic agent following TURBT.85 No significant difference in efficacy among the chemotherapeutic agents (doxorubicin, epirubicin, mitomycin C) was noted.

European Association of Urology (EAU) guidelines recommend one immediate post operative instillation of chemotherapy in all patients after TUR of presumed NMIBC [96]. The American Urological Association (AUA) guidelines panel considered the immediate use of intravesical chemotherapy an option and not a standard because of potential cost issues, uncertainty of pathology, side effects and patient preference [92].

Immediate instillation of intravesical chemotherapy should not be done in the event of overt or suspected bladder perforation or excessive bleeding following TURBT. BCG can never be safely administered immediately after TURBT because of the risk for bacterial sepsis and death [118].

Role of intravesical therapy in the treatment of initial, small-volume, low-grade, Ta bladder cancer (low-risk disease)
Following complete TURBT, single-dose, immediate instillation of intravesical chemotherapy is recommended by the AUA and the EAU guidelines on NMIBC [92,96]. Meta-analysis and comparative study by the AUA guideline panel showed combination of TURBT and single-dose, immediate instillation of intravesical mitomycin C results in 17% (95% CI, -8, -28) fewer recurrences then TURBT alone when all patient risk-groups were considered [92]. A meta-analysis by the EAU guideline panel demonstrated that one immediate instillation of intravesical chemotherapy after TUR decreased the percentage of patients with recurrence by 12% (from 48.4% to 36.7%).96 The benefit was confirmed in both single and multiple tumors [85]. There is no evidence that multiple adjuvant instillations of either BCG or chemotherapy have additional benefits in patients at initial diagnosis of Ta Grade 1 bladder cancer [92]

Role of intravesical therapy in the treatment of patients with multifocal and/or large-volume, low-grade Ta or recurrent low-grade Ta bladder cancer (Intermediate-risk group):
Intermediate risk group patients should be treated with TURBT and immediate instillation of intravesical chemotherapy [85]. The AUA guideline panel recommends the use of induction course of intravesical BCG or mitomycin C in this group of patients with the goal of preventing or delaying recurrence [92]. In intermediate-risk patients, recurrences were reduced by 24% (95% CI, 3, 47) with the combination of TURBT and BCG induction only and by 3% (95% CI, -10, 16) with TURBT and mitomycin C induction compared with TURBT alone [92].

Role of maintenance intravesical therapy in intermediate-risk-group patients
Meta-analysis by the AUA guideline panel of randomized controlled trials between 1990 and 2006 demonstrated that compared to TURBT alone, recurrences are decreased by 31% (95% CI, 18, 42) with TURBT and BCG therapy (induction plus maintenance) and by 18% (95% CI, 6, 30) with TURBT and mitomycin C induction plus maintenance regimen [92].

The optimal maintenance schedule and duration has yet to be determined. However, the best available evidence supports the use of SWOG regimen of a 6-week induction course of BCG followed by a 3-week maintenance course at 3, 6, 12, 18, 24, 30, and 36 month if tolerated by the patient [92,119].

For intermediate-risk group patients, EAU guideline recommends the use of either BCG or mitomycin C maintenance regimen. The AUA guidelines panel advised that maintenance regimen in this group of patients is an option that should be discussed with the patient [92]

Role of intravesical therapy in the treatment of patients with an initial diagnosis of high-grade Ta, T1, and/or Tis bladder cancer (high-risk disease)
For patients with lamina propria invasion but without muscular propria in the specimen, repeat resection should be performed prior to intravesical therapy.92 Data suggest that 20% to 40% will have either residual tumor and/or unrecognized muscle-invasive disease [120,121,122].

High-grade T1 lesions recur in more than 80% of cases and progress in 50% of patients within 3 years [118]. The goal of treatment in this group of patients is to reduce both the risk for recurrence and progression.

Both the AUA and the EAU guidelines recommend the use of induction course of BCG followed by maintenance regimen.92,96 According to AUA, cystectomy is considered an option for initial therapy in select patients with high-grade Ta, T1 and/or CIS because of the risk of understaging muscle-invasive disease initially or progression to muscle-invasive disease [92]. According to the EAU, immediate radical cystectomy may be offered to the highest-risk patients, such as those with multiple recurrent tumors, high-grade T1 tumors, or high-grade tumors with CIS [96]

Role of BCG in the treatment CIS
A meta-analysis revealed a 68% complete response rate with BCG and 49% complete response rate with chemotherapy in patients with CIS. In the complete responders, 68% of patients treated with BCG remained disease-free as compared to 47% of patients receiving chemotherapy based on a median followup of 3.75 years. The overall disease-free rates were 51% and 27% [91,123].

The AUA guideline for the management of NMIBC and EAU guidelines on the diagnosis and treatment of urothelial carcinoma in situ recommends the use of induction course of BCG followed by maintenance cycle for CIS. BCG intravesical therapy is also approved by the FDA for use in CIS [92,123]

Treatment of patients with high-grade, Ta, T1, and/or CIS bladder cancer that has recurred after prior intravesical therapy
The standard treatment for patients with lamina propria invasion (T1) but without muscularis propria in the specimen, is repeat resection prior to further intravesical therapy. Cystectomy should be considered as a therapeutic alternative for these patients. The high likelihood of intravesical treatment failure and adverse consequence of delaying cystectomy make cystectomy the preferred treatment for these patients [92].

Further intravesical therapy is considered an option by the AUA guideline in these patients. There is some evidence that select patients will respond to second induction regimens, particularly with BCG [96,124,125]. Intravesical valrubicin therapy is approved by the FDA in BCG refractory CIS patients has a reported 18% disease-free rate at 6 months [108]. Repeat intravesical therapy may be appropriate in patients who develop a late recurrence after previous complete response to an intravesical agent.


Concluding Remarks

Bladder cancer is a common genitourinary malignancy with significant impact on quality of life, survival and economics. Early diagnosis and treatment remain the goal. Recent advances in urine markers, diagnostic techniques and intravesical therapies enhance the evaluation and treatment of this condition. An understanding of the advantages and limitations of newer urine biomarkers is critical to identifying the roles they may play in select patients. Furthermore, an understanding of the role of blue light cystoscopy with hexaminolevulinate plays in the detection of bladder cancer will help improve detection and optimize endoscopic treatment of bladder cancer. Lastly, optimal use of current intravesical therapy after TURBT may serve to decrease the risk of recurrent/progressive bladder cancer. 

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