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Journal of Clinical Oncology, Vol 24, No 19 (July 1), 2006: pp. 3075-3080 © 2006 American Society of Clinical Oncology. DOI: 10.1200/JCO.2005.03.1161 Phase I Trial of Intravesical Docetaxel in the Management of Superficial Bladder Cancer Refractory to Standard Intravesical Therapy
From the Columbia University Medical Center, New York, NY Address reprint requests to Puneet Masson, MD, Columbia University Medical Center, 161 Fort Washington Ave, 11th Floor, Department of Urology, New York, NY 10032; e-mail: pm2016{at}columbia.edu
PURPOSE: Up to 50% of patients treated with intravesical agents for superficial bladder cancer will experience recurrence. Response rates to second-line intravesical therapies range from 20% to 40%. For these high-risk patients, novel agents are necessary to prevent recurrence. Docetaxel is a microtubule depolymerization inhibitor with unique physiochemical properties, making it an excellent candidate for investigation as an intravesical agent. PATIENTS AND METHODS: This phase I trial included patients with recurrent Ta, T1, and Tis transitional cell carcinoma who experienced treatment failure with at least one prior intravesical treatment. Docetaxel was administered as six weekly instillations at a starting dose of 5 mg, with a dose-escalation model used until a maximum tolerated dose (MTD) was achieved. Primary end points were dose-limiting toxicity (DLT) and MTD. Efficacy was evaluated by cystoscopy with biopsy, cytology, and computed tomography imaging. RESULTS: Eighteen patients (100%) completed the trial, and the distribution of stages included six patients with Tis, seven with Ta, and five with T1 disease. No grade 3 or 4 DLTs occurred in 108 infusions, and no patient had systemic absorption of docetaxel. Eight (44%) of 18 patients experienced grade 1 or 2 toxicities, with dysuria being the most common. Ten (56%) of 18 patients had no evidence of disease at their post-treatment cystoscopy and biopsy. None of the patients who experienced relapse had disease progression. CONCLUSION: Intravesical docetaxel exhibited minimal toxicity and no systemic absorption in the first human intravesical clinical trial. This suggests that docetaxel is a safe agent for further evaluation of efficacy in a phase II trial.
In 2005, an estimated 63,210 new cases of bladder cancer will be diagnosed in the United States and approximately 13,180 people will die from the disease.1 Superficial transitional-cell carcinoma (TCC) accounts for 70% to 80% of these cases; in individual cases with high-risk clinical and pathologic features (Ta, T1, and Tis), intravesical therapy has become the standard of care.2 Unfortunately, up to 50% of patients treated with intravesical therapies for high-risk superficial transitional cell carcinoma will recur.3 Previously studied second-line and salvage intravesical therapies have response rates of 20% to 40%, respectively.4,5 When currently available intravesical agents fail to control disease, the option most likely to improve patient survival is radical cystectomy with urinary diversion. Not all patients are candidates for radical cystectomy; multiple trials have demonstrated that radical cystectomy is associated with significant short-term and long-term morbidities, and many patients refuse or are medically unfit to undergo this operation.6-9 For this subgroup of patients, there are limited alternatives, so there is an active need to investigate other intravesical options.
Docetaxel (Taxotere; sanofi-aventis, Bridgewater, NJ; [(2R,3S)-N-carboxy-3-phenylisoserine, N-tert-butyl ester,13-ester with 5ß, 20-epoxy-1, 2 Both docetaxel and its close molecular relative, paclitaxel (Taxol; Bristol-Myers Squibb Co, Princeton, NJ), have been extensively studied in vitro and proven effective in TCC cytotoxicity assays. Docetaxel has been proven effective in inhibiting growth of human bladder tumor cell lines at concentrations as low as 0.1 µmol.23 In a study involving beagle dogs, Song et al24 instilled paclitaxel 500 µg in 20 mL water into the bladder of each dog and found that the plasma concentration of paclitaxel after intravesical instillation was less than 0.05% of the maximally tolerated plasma concentration of paclitaxel in humans (1 µg/mL). Song et al24 also found that intravesical paclitaxel produces a substantial chemotherapeutic targeting advantage, with a 6,000-fold greater average bladder tissue concentration of the drug compared with its intravenously administered steady-state plasma concentration. The systemic efficacy of docetaxel, its relatively high molecular weight of 861.9 da, and the preclinical safety data available for its close molecular relative, paclitaxel, in the animal model make it a logical candidate for a phase I trial in patients with refractory superficial bladder carcinoma. The primary objectives of this study were to determine the safety and toxicity profile of intravesical docetaxel and to define the maximum-tolerated dose (MTD) of docetaxel by an intravesical route.
Eligibility Criteria All patients had a histologically confirmed diagnosis of superficial transitional cell carcinoma of the urinary bladder (Ta, T1, or Tis) at Columbia University Medical Center and were deemed medically unable to undergo radical cystectomy or had refused cystectomy. Demonstrated evidence of recurrent superficial bladder cancer refractory to standard intravesical therapy, including Bacillus Calmette-Guerin (BCG), mitomycin, interferon, or any combination thereof, was required. All grossly visible disease was fully resected before the study. Other eligibility criteria included the following: age 18 years; Eastern Cooperative Oncology Group (ECOG) performance status 0 to 2; no previous intravesical therapy for 6 weeks; no history of prior radiation to the pelvis; peripheral neuropathy grade 1; and adequate hematopoietic and hepatic parameters. Specific exclusion criteria included muscle-invasive disease (T2-T4), prior treatment with docetaxel, concomitant treatment with any chemotherapeutic agent, history of severe hypersensitivity reaction to docetaxel or other drugs formulated with polysorbate 80, history of vesicoureteral reflux or an indwelling urinary stent, any other malignancy diagnosed within 2 years of study entry (except basal or squamous cell skin cancers or noninvasive cancer of the cervix), participation in any other research protocol involving administration of an investigational agent within 3 months before study entry, and any contraindication to prescribed immunosuppressive medications because of a confounding medical condition. Female patients who were pregnant or lactating also were excluded. Columbia University Medical Center's Herbert Irving Comprehensive Cancer Center and institutional review board approved the study protocol and consent, and all patients gave written informed consent before enrollment.
All patients were screened by the principle investigator (J.M.M.) to ensure eligibility requirements were met. Weight, vital signs, and ECOG performance status were also evaluated. Adequate hematopoietic (absolute neutrophil count
Study Drug and Preparation
Drug Administration During each treatment, all patients had an updated history performed by the principle investigator. Patients were screened to evaluate local bladder toxicity using the National Cancer Institute Common Toxicity Criteria version 2.0 (NCICTC 2.0). A physical examination and assessment of ECOG status were performed, and urine was evaluated for pH by dipstick. If the urine pH was outside the range of docetaxel solubility (pH 5 to 7), the treatment was withheld. The phase I trial was begun with an initial dose of docetaxel 5 mg in 40 mL normal saline (NS). The final solution of the medication was infused by a Bardex All-Silicone 18-F Foley catheter. Before instillation, the bladder was emptied by sterile urethral catheterization. Patients then received the docetaxel solution intravesically over a 5-minute infusion, weekly for 6 weeks. Patients retained the drug in the bladder for 2 hours before voiding. Two hours after voiding, high-pressure liquid chromatography (HPLC) serum docetaxel levels and a CBC were checked for the determination of systemic toxicity. Evidence of systemic absorption of docetaxel was measured weekly by HPLC as described by Rouini et al25 and Ardiet et al.26 On even-numbered treatment cycles (treatments 2, 4, and 6), patients also had basic metabolic panel, hepatic function panel, and coagulation studies checked for evidence of electrolyte abnormalities, renal dysfunction, coagulopathy, or hepatic dysfunction. If any evidence of grade 2, 3, or 4 systemic toxicity was found in these laboratory values, then the patient was immediately removed from the trial and was deemed to have systemic dose-limiting toxicity (DLT).
Treatment Assessment
Toxicity Evaluation
Dose Escalation and Statistical Analysis Response was based on each patient's 10-week post-treatment cystoscopy, including a biopsy of the urothelium and cytology, which occurred after the initial resection of tumor tissue and at 4 weeks after the six weekly infusions of intravesical docetaxel. Therefore, disease-free status (DFS) was defined as a negative post-treatment cystoscopy, including a biopsy of the urothelium and a negative cytology. A partial response (PR) was defined as a negative bladder biopsy with persistent positive cytology. No response (NR) was defined as a positive bladder biopsy.
Patient Characteristics Eighteen patients were enrolled onto the study (Table 1 ). The median age was 75 years (range, 39 to 89 years). Sixteen males and two females were enrolled, for a male-female ratio of 8:1. Sixteen patients had refused surgery, and two patients were deemed medically ineligible for radical cystectomy. All eighteen patients had an ECOG performance score of 0. Every patient had refractory TCC; seven patients had disease stage Ta, six had stage Tis, and five had stage T1. All patients received prior intravesical treatment with BCG, including BCG (nine of 18) and BCG/interferon (nine of 18), with a mean of three prior treatments. Four patients received prior intravesical chemotherapeutic treatments with mitomycin, valrubicin, or thiotepa.
Toxicity Three patients were treated at each dose level (Table 2). Eight patients (44%) experienced grade 1 and 2 local toxicities (Table 3). Four patients experienced grade 1 dysuria, three had grade 1 hematuria, and two had grade 1 urgency. Two patients experienced grade 2 hematuria and had their docetaxel dose withheld 1 week. All grade 1 and 2 toxicities resolved without any clinical intervention. Ten patients (56%) did not experience any grade 1 or 2 toxicities, and no toxicities were encountered at the highest docetaxel dose level. No systemic toxicities were observed in this trial; 108 HPLC serum measurements from 108 infusions all revealed undetectable plasma levels of docetaxel. Two patients on the first regimen reported facial flushing. No grade 3 or 4 toxicities were observed, and no DLT was encountered in this trial. Dose escalation was terminated at docetaxel 75 mg in 100 mL NS, because of the expected inability to infuse higher delivery volumes for a 2-hour dwell time and because the solubility of docetaxel did not permit increased concentrations beyond 75 mg/100 mL NS. All patients (18 of 18) achieved a successful 2-hour dwell time.
Response Ten (56%) of the eighteen patients having completed the study achieved DFS with docetaxel at 5 mg (three patients), 10 mg (one patient), 20 mg (three patients), 60 mg (two patients), and 75 mg (one patient; Table 4). Of the patients achieving DFS, five patients had high-grade pretreatment stage Ta, three patients had stage Tis, and two patients had T1. Two patients (11%) achieved PR, and six patients (33%) had NR. Four (67%) of the six patients with NR elected to undergo cystectomy, and no patient had a final pathologic stage greater than T1.
In a rapidly aging population with declining cardiovascular mortality rates, the incidence of elderly patients with high-risk TCC is increasing.1 Definitive treatment with radical cystectomy is often not feasible or not desireable within the patient. The human urinary bladder is highly impermeable to toxic substances and is easily accessed by catheterization. This makes the bladder an ideal environment for the instillation of novel intravesical agents in an attempt to achieve local disease control and organ preservation. Intravesical treatment with BCG is the most common therapy for high-grade, superficial TCC27 and has been highly effective in delaying time to recurrence in this disease.28-30 In patients with Tis alone, BCG has been the most effective agent, with two-thirds of patients responding to BCG.31 Unfortunately, recurrence after BCG therapy is associated with poor health outcomes, and a significant number of patients have lifelong risk for disease progression.32,33 Our study population was comprised of individuals with highly resistant disease and increased risk for recurrence; they had previously failed an average of three treatments with the most effective intravesical agents currently available. Although efficacy was not the primary objective in this phase I trial, the presence of activity in 12 (67%) of our 18 heavily pretreated patients suggests that docetaxel may be of value to patients failing treatment with BCG. Safety and tolerability were the primary objectives of this study, so the systemic absorption of docetaxel was an important concern. Although docetaxel is routinely given intravenously for carcinoma of the breast, prostate, and lung, it has never been administered intravesically in humans. Its close molecular relative, paclitaxel, has shown minimal systemic absorption in intravesical animal models. Used previously as intravesical therapy in beagle dogs, paclitaxel has an almost identical molecular weight (853.9 da) to docetaxel (861.9 da).24 Systemic absorption of chemotherapeutic drugs through the bladder wall is highly unlikely for compounds with a molecular weight greater than 300 da.9 Current intravesical chemotherapeutic agents, such as mitomycin C and doxorubicin, have molecular weights of 334 and 580 da, respectively.34 Despite the low risk of absorption, we had several safeguards in our study design: First, all patients were pretreated with dexamethasone, as it has been shown to reduce the incidence and severity of fluid retention and hypersensitivity reaction.35 Second, we measured serum docetaxel levels weekly with HPLC analysis to evaluate systemic absorption. With these two conservative precautions in place, we ensured that no patients experienced any systemic absorption of docetaxel. Intravesical docetaxel given weekly for 6 weeks demonstrated excellent tolerability in this phase I clinical trial. Treatment was safe and tolerable at doses up to 75 mg/100 mL NS per instillation, and there was no evidence of systemic absorption or DLT. Only 44% of patients experienced grade 1 and 2 toxicities, including grade 1 dysuria, grade 1 and 2 hematuria, and grade 1 frequency; all of these symptoms were defined by the NCICTC 2.0 as resolving without any clinical intervention. Although efficacy was not a primary end point of our study, the preliminary response data in this patient population merits further investigation in a phase II trial. In a cohort of three patients at every dose level, no observable correlation occurred between dose and toxicity or between dose and response. Grade 1 and 2 toxicities were experienced at every dose level, except for at the maximum administered dose of docetaxel 75 mg. Activity, based on response, was demonstrated at each dose level. The response remained unpredictable as the dose was increased. Because only three patients were treated at each dose level, it is impossible to determine whether a dose-response relationship would exist. Based on the need for intravesical chemotherapeutic alternatives for localized bladder cancer and on the preliminary efficacy data in our heavily resistant population, intravesical docetaxel merits further investigation. Because of the positive findings of this study, we plan to evaluate the docetaxel 75 mg/100 mL NS weekly for 6 weeks in a larger phase II trial.
Although all authors completed the disclosure declaration, the following authors or their immediate family members indicated a financial interest. No conflict exists for drugs or devices used in a study if they are not being evaluated as part of the investigation. For a detailed description of the disclosure categories, or for more information about ASCO's conflict of interest policy, please refer to the Author Disclosure Declaration and the Disclosures of Potential Conflicts of Interest section in Information for Contributors.
Dollar Amount Codes (A) < $10,000 (B) $10,000-99,999 (C)
Supported in part by the sanofi-aventis Corp. Presented at the 100th Annual Meeting of the American Urological Association National Convention, San Antonio, TX, May 21-26, 2005. Authors' disclosures of potential conflicts of interest and author contributions are found at the end of this article.
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Copyright © 2006 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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