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British Journal of Cancer logoLink to British Journal of Cancer
. 2006 Apr 18;94(10):1395–1401. doi: 10.1038/sj.bjc.6603118

A phase II study of vinflunine in bladder cancer patients progressing after first-line platinum-containing regimen

S Culine 1, C Theodore 2, M De Santis 3, B Bui 4, T Demkow 5, J Lorenz 6, F Rolland 7, F-M Delgado 8, B Longerey 8, N James 9,*
PMCID: PMC2361290  PMID: 16622447

Abstract

A multicentre phase II trial to determine the efficacy of vinflunine as second-line therapy in patients with advanced transitional cell carcinoma (TCC) of the bladder; secondary objectives were to assess duration of response, progression-free survival (PFS) and overall survival (OS), and to evaluate the toxicity associated with this treatment. Patients had tumours that failed or progressed after first-line platinum-containing regimens for advanced or metastatic disease, or had progressive disease after platinum-containing chemotherapy given with adjuvant or neoadjuvant intent. Response and adverse events were assessed according to WHO criteria and NCI-CTC (version 2), respectively. Out of 51 patients treated with 320 mg m−2 of vinflunine, nine patients responded to the therapy yielding an overall response rate of 18% (95% CI: 8.4–30.9%), and 67% (95%CI: 52.1–79.3%) achieved disease control (PR+SD). Of note, responses were seen in patients with relatively poor prognostic factors such as a short (<12 months) interval from prior platinum therapy (19%, including an 11% response rate in those progressing <3 months after platinum treatment), prior treatment for metastatic disease (24%), prior treatment with vinca alkaloids (14%) and visceral involvement (20%). The median duration of response was 9.1 months (95% CI: 4.2–15.0) and the median PFS was 3.0 months (95% CI: 2.4–3.8). The median OS was 6.6 months (95% CI: 4.8–7.6). The main haematological toxicity was grade 3–4 neutropenia, observed in 67% of patients (42% of cycles). Febrile neutropenia was observed in five patients (10%) and among them two were fatal. Constipation was frequently observed (but was manageable and noncumulative) and was grade 3–4 in only 8% of patients. The incidence of grade 3 nausea and vomiting was very low (4 and 6% of patients, respectively). Neither grade 3–4 sensory neuropathy nor severe venous irritation was observed. Moreover, and of importance in this particular study population, no grade 3–4 renal function impairment was observed. Vinflunine is an active agent for the treatment of platinum-pretreated bladder cancer, and these results warrant further investigation in phase III trials, either as monotherapy or in combination with other agents as treatment of advanced/metastatic TCC of the bladder.

Keywords: vinflunine, phase II, transitional cell carcinoma (TCC) of the bladder


Before the development of effective chemotherapy, median survival of patients with metastatic bladder cancer rarely exceeded 4 months. Treatment with cisplatin, approved for the treatment of advanced disease in the early 1980s, doubled median survival to 8 months (Loehrer et al, 1992).

The combination regimen including methotrexate, vinblastine, doxorubicin and cisplatin (M-VAC) was devised at Memorial Sloan-Kettering in the mid 1980s (Sternberg et al, 1988) and improved overall survival to a median slightly in excess of 12 months and became the standard of care worldwide for advanced bladder cancer (Culine, 2002).

Gemcitabine was developed in the late 1990s and, as a single agent, produced objective response rates ranging from 11 to 29% in second-line (Lorusso et al, 1988; Gebbia et al, 1999; Albers et al, 2002), and of 24–45% in first-line therapy (Moore et al, 1997; Stadler et al, 1997; Castagneto et al, 2004). A combination regimen of cisplatin and gemcitabine was developed and compared with M-VAC, producing comparable efficacy results, and a reduction of side effects (most notably severe mucositis and infections, as well as alopecia) (Von Der Maase et al, 2000). Based on these results, gemcitabine (in combination with cisplatin) received regulatory approval for the first-line treatment of advanced bladder cancer in the European Union as well as in several other countries. Although not approved in the US, the gemcitabine/cisplatin regimen has been widely adopted for this indication.

Recent years have witnessed the establishment of neoadjuvant chemotherapy as a treatment modality superior in survival to surgery or radiotherapy alone for muscle-invasive bladder cancer, and this observation is currently supported by large randomised trials as well as by meta-analyses (Meta-Analysis, 2003). Owing to this, and not dissimilarly from other tumours, the most active agents and combinations are currently employed in early stages of the disease.

For patients whose disease relapses or progression after initial treatment limited options exist and new active drugs are needed.

Vinflunine ditartrate (Javlor®, Pierre Fabre Médicament, Boulogne-Billancourt – France) is a novel antitubulin agent obtained by a semisynthetic process from a vinca alkaloid base showing higher antitumour activity compared with parent compounds.

Vinflunine showed definite (high or moderate) antitumour activity in 64% (seven out of 11) of xenografts tested, compared with vinorelbine which showed only moderate activity in 27% (three out of 11) (Kruczynski et al, 1998a, 1998b; Hill et al, 1999). Furthermore, a preclinical study effects of vinflunine on a murine bladder cancer cell line (MB-49) showed clear cytotoxic activity (Bonfil et al, 2002). Vinflunine was thus considered a good candidate for further clinical study in bladder cancer.

Single agent vinflunine was studied in several clinical phase I trials utilising different schedules (Delord et al, 2001; Bennouna et al, 2003; Johnson et al, 2005), leading to the selection of the 3 weekly schedule for phase II evaluation.

PATIENTS AND METHODS

Objectives

This study was an open-label, multicentre, noncomparative phase II trial designed to determine the efficacy of vinflunine in patients with advanced transitional cell carcinoma (TCC) of the bladder previously treated with one platinum-based line of chemotherapy. The primary objective was to assess efficacy in terms of tumour response rate; secondary objectives were to assess duration of response, progression-free survival (PFS) and overall survival (OS), and to evaluate the treatment related toxicity.

The protocol and its amendments were submitted to Independent Ethics Committees according to local requirements. The study was conducted in accordance with the ethical principles set forth in the Declaration of Helsinki and in compliance with Good Clinical and Laboratory Practices. Written informed consent was obtained before entry into the study.

Patient selection

A total sample size of 50 evaluable patients was calculated using the 1-sample multiple testing procedure of Fleming for phase II clinical trials (Fleming, 1982). A small excess in recruitment was allowed to replace possible dropouts.

Patients were recruited from 16 European centers between November 2000 and September 2002. Eligible patients had histologically proven TCC of the bladder, which had failed or progressed after first-line platinum-containing regimens for advanced or metastatic disease, or treatment given with adjuvant or neoadjuvant intent. Previous systemic chemotherapy or radiotherapy had to have been stopped 30 days before the administration of the study drug with full recovery from all severe side effects. The presence of at least one bidimensionally measurable lesion, not previously irradiated, assessed by CT-scan or MRI performed <28 days before first day of study drug administration was required. Patients were required to be aged ⩾18 years with Karnofsky performance status (KPS) ⩾80 and an estimated life expectancy ⩾12 weeks with adequate haematological function (absolute neutrophil count ⩾2.0 × 109 l−1, platelets ⩾100 × 109 l−1), hepatic function (bilirubin ⩽1.5 × upper normal limit (UNL), transaminases ⩽2.5 × UNL, unless due to liver involvement), renal function (calculated clearance of creatinine ⩾40 ml min−1, Cockcroft-Gault formula) and a normal electrocardiogram (ECG).

Treatment schedule

Patients were treated at the beginning of study with intravenous (i.v.) vinflunine 350 mg m−2 as a 10 min infusion 3 weekly based on the previous phase I trial (Bennouna et al, 2003). A preliminary safety evaluation, performed programwide across all ongoing vinflunine phase II trials, led to a dose reduction to 320 mg m−2 3 weekly (the next lower dose level of the preceding phase I trial).

Tolerance was assessed throughout the treatment period and before each administration according to the NCI Common Toxicity Criteria (Version 2.0). All patients who received at least one cycle were considered evaluable for safety. The use of haematopoietic growth factors (G-CSF) was allowed for patients with febrile neutropenia or neutropenic infections.

Vinflunine administration was delayed by 1 or 2 weeks in the case of significant haematological or nonhaematological toxicity (grade >2 toxicity impacting a major organ except for alopecia).

If febrile neutropenia and/or grade 4 neutropenia (<0.5 × 109 l−1) lasting ⩾7 days was observed between two subsequent administrations of vinflunine, the dose was reduced to 280 mg m−2 from the next cycle on. If, after dose reduction, this toxicity was seen again, the dose was further reduced to 250 mg m−2. If at this dose level the same event recurred, the treatment was stopped. Blood counts were performed every 2 days until recovery of ANC ⩾1.0 × 109 l−1. No dose re-escalation was allowed after dose reduction. In case of grade 2 mucositis and/or constipation lasting >5 days, or grade ⩾3 mucositis, and/or constipation of any duration, the vinflunine dose was reduced to 280 mg m−2 from the next cycle on. If, after dose reduction, one of these toxicities was seen again, the dose was reduced to 250 mg m−2. If at this dose the event recurred, the treatment was discontinued. Each patient received at least two cycles of treatment unless one of the following occurred: early progression, unacceptable toxicity, serious intercurrent illness, other reactions which could affect the clinical status of the patient to a significant degree requiring discontinuation of the drug, or request by the patient to withdraw consent.

After the initial two cycles, tumour response was assessed. Patients with progressive disease (PD) discontinued treatment; those with stable disease (s.d.) received two additional cycles of vinflunine, were assessed a second time and treatment was continued according to the Investigator's opinion. Complete or partial responders (CR, PR) could continue treatment either until PD, toxicity or patient preference precluded further therapy.

Baseline and treatment evaluation

Preregistration assessments included a detailed medical history, physical examination, CT or MRI scan. All positive imaging procedures at study entry were repeated every 6 weeks. An assessment of symptoms was made at study entry and then throughout treatment. Physical examination and vital signs were assessed on day 1 of each cycle. A complete blood cell count was performed at baseline (within 7 days of drug administration), before each cycle and at days 8 and 15 of each cycle, repeated every 2 days if the ANC was <1.0 × 109 l−1 until recovery to ANC ⩾1.0 × 109 l−1. Transaminases, alkaline phosphatase, total bilirubin, creatinine, electrolytes and total protein were assessed at every cycle. An ECG was performed at baseline and repeated every cycle.

If a patient did not progress by the end of the study, all lesions were regularly assessed until either the patient progressed or started other anticancer therapy. Response was assessed using the WHO criteria (WHO Handbook, 1979; SWOG, 1992). In order to be confirmed, CR and PR were to be maintained for at least 4 weeks, while no other type of lesion progressed or appeared. All responses and disease stabilisations were individually reviewed and confirmed by an independent radiologist, as stipulated by the study protocol.

According to WHO criteria, the duration of response was calculated for patients with confirmed response (CR or PR) from the date of registration until the date of documented progression, death, last follow-up or last news. Any responding patient alive without progression was censored at the date of commencement of new treatment or at last contact. Progression-free survival was defined as the time elapsed from registration until progression, death, lost follow-up or last information available. Progression-free survival of patients alive without progression was censored at the date of last information. Survival was defined as the time elapsed from registration to death or lost follow-up. The statistical analysis was performed on an intent-to-treat (ITT) basis on all patients registered and treated.

RESULTS

In total, 58 patients with advanced or metastatic TCC of the bladder were included in this study. One patient died before receiving any treatment, hence was not included in the analysis. Six patients treated initially at 350 mg m−2 represent too small a group to justify an extensive separate analysis, therefore results are focused on the 51 patients treated at 320 mg m−2, the majority of whom (84%) relapsed or progressed within 12 months of initial chemotherapy.

Demographic features are summarised in Table 1. Prior therapy included surgery, radiotherapy, or local bladder instillations of either chemotherapy or BCG and all had received systemic platinum-based chemotherapy; 22 patients (43%) received M-VAC or CMV and 25 patients (49%) gemcitabine/platinum (Table 2). Prior chemotherapy was for advanced disease in 34 patients (67%) and as adjuvant or neoadjuvant chemotherapy in 17 patients (33%) (Table 3). The median treatment-free interval between completion of initial chemotherapy and vinflunine treatment was 7.5 months (range: 0.9–94.3). All patients enrolled in the study had clear evidence of PD, 61% had two or more metastatic lesions at entry and 49% had visceral involvement.

Table 1. Demographic data.

No. of patients (%): 51(100)  
Age (years)  
 Median 63
 Range (42–81)
   
Karnofsky performance status  
 100 12 (24)
 90 16 (31)
 80 22 (43)
 70 1 (2)
   
 Males 41 (80)
 Females 10 (20)
   
Stage at diagnosis  
 Unknown 11 (22)
 0IS 1 (2)
 I 5 (10)
 II 3 (6)
 III 8 (16)
 IV 23 (45)
   
Number of organs involved  
 1 20 (39)
 2 19 (37)
 ⩾3 12 (24)
   
 Lung only 7 (13.7)
 Liver only 6 (11.8)
 Bone only 1 (2.0)
 Lymph nodes 34 (66.7)
 Skin 2 (3.9)
 Soft tissues 8 (15.7)
 Lung+liver 9 (17.6)
 Lung+bone 1 (2.0)
 Liver+bone 2 (3.9)
 Other organs 12 (23.5)

Table 2. Previous local anticancer therapies.

  Initial dose of vinflunine
Treatment 350 mg m−2 N (%) 320 mg m−2 N (%)
No. of patients 6 51
Surgery alone 5 (83.3) 31 (60.7)
Radiotherapy alone 2 (3.9)
Surgery+radiotherapy 1 (16.6) 15 (29.4)

Table 3. Prior treatment.

No. of patients (%) 51(100)
Systemic platinum chemotherapy 51 (100)
 For metastatic disease 34 (67)
  gemcitabine/platinum 17
  M-VAC/CMV 13
  Other platinum regimens 4
 For neoadjuvant/adjuvant 17 (33)
  gemcitabine/platinum 8
  M-VAC/CMV 9

Efficacy evaluation

Among the 51 patients treated at 320 mg m−2, nine obtained a partial response (18% (95% CI: 8.4–30. 9%) and 25 achieved s.d., for an overall disease control rate (PR+s.d.) of 67% (95% CI: 52.1–79.3%). Three patients could not be evaluated for response, but are kept in the denominator for the purpose of the calculation of the response rate (Table 4).

Table 4. WHO response rate according to platinum-free interval of patients treated with 320 mg m−2.

    Platinum-free interval at study entry
  ITT population <3 months 3–12 months ⩾12 months
No. of patients (%) 51 (100%) 19 (100%) 24 (100%) 8 (100%)
Response rate 9 (18%) 2 (11%) 6 (25%) 1 (13%)
  (95%CI : 8.4–30.9%) (95%CI : 1.3–33.1%) (95%CI : 9.8–46.7%) (95%CI : 0.3–52.7%)
Stable disease (SD) 25 (49%) 9 (47%) 11 (46%) 5 (63%)
Disease control 34 (67%) 11 (58%) 17 (71%) 6 (75%)
  (95%CI : 52.1–79.3%) (95%CI : 33.5–9.8%) (95%CI : 48.9–87.4%) (95%CI : 34.9–96.8%)
Progressive disease (PD) 14 (28%) 6 (32%) 6 (25%) 2 (25%)
Nonevaluable (NE) 3 (6%) 2 (11%) 1 (4%)

Disease control rates appeared to correlate with the interval from prior platinum treatment, with better results in late relapsing or progressing patients. Objective response rates were eight out of 34 (24%) and one out of 17 (6%) in patients previously treated in the metastatic and neoadjuvant/adjuvant setting, respectively.

Of note, objective responses were observed in three out of 22 (14%) patients who had received prior vinca alkaloids as a component of the M-VAC or CMV regimens.

Responses were predominantly seen in patients who had previously responded to chemotherapy, although numbers are too small to exclude random variation. However, five out of 25 (20%) of patients with visceral involvement achieved an objective response and responses were seen in patients with primary chemo-resistant disease (Table 5).

Table 5. Description of responders.

Age Previous chemotherapy Response to previous chemotherapy Site of disease Response to vinflunine Cycles total (N) Time to first response (months)
62 GC NC Lymph nodes PR 7 4.2
71 GC PD Lymph nodes+lung PR 6 1.3
76 CMV PR Lymph nodes PR 4 1.7
71 GC PR Lymph nodes+lung PR 8 1.3
50 GC PR Liver + lung PR 8 1.3
79 GC PR Liver + lung PR 6 2.1
64 M-VAC PR Lymph nodes PR 4 1.5
63 GC NA Lymph nodes PR 8 1.3
45 CMV + GC CR Lung PR 5 1.1

CMV=cisplatin, methotrexate, vinblastine; GC=gemcitabine, cisplatin; M-VAC=methotrexate, vinblastine, adriamycin, cisplatin.

Of the six additional patients who started the trial at a dose of 350 mg m−2, only three were evaluable and none responded.

The median duration of response was 9.1 months (95% CI: 4.2–15.0). Among the 51 patients treated at 320 mg m−2, the median PFS was 3.0 months (95% CI: 2.4–3.8) and the median overall survival was 6.6 months (95% CI: 4.8–7.6).

Karnofsky performance status was recorded for each patient at baseline and before each treatment cycle during the study (every 3 weeks). Of 51 (22%) patients, 11 demonstrated improvement in performance status during treatment, and 27 (53%) maintained their baseline status. Only 10 patients (20%) had a worsening during treatment.

Safety evaluation

A total of 15 cycles were administered to six patients initially treated at 350 mg m−2. The most frequent adverse events at this dose included leucopenia, neutropenia and anaemia, which were observed in all six patients (100%) with one fatal febrile neutropenia.

The total number of cycles administered at 320 mg m−2 was 197 (median four cycles, range 1–12) with median relative dose intensity of 95.5%. Of 51 (35%) patients (14% of cycles), 18 had dose reductions with the majority from 320 mg m−2 to 280 mg m−2 affecting 14 of 146 cycles (10%). Dose reductions to the lowest planned dose (250 mg m−2) occurred only in six cycles (4%).

During the study, 23 of 51 (45%) patients experienced grade 3–4 leucopenia (27% of cycles), with grade 3–4 neutropenia in 34 patients (67%) (42% of cycles) (Table 6), 10 (29%) of whom had received radiotherapy in the pelvic area. The median nadir value for leucocytes and neutrophils was 2.2 × 109 l−1 and 0.6 × 109 l−1, respectively. The median cycle at which both leucocyte and neutrophil nadirs occurred was the second cycle of treatment (on days 7 and 12, respectively). The median duration of leucopenia and neutropenia was 7 days. Anaemia was rarely severe; only 14% of patients developed grade 3 toxicity (5% of cycles). The incidence of thrombocytopenia was also low, only three (6%) patients developed grade 3 thrombocytopenia (2% of cycles). Five patients (10%) experienced febrile neutropenia and two of them died (both had received multiple courses of vinflunine). Grade 3–4 neutropenia complicated with infection were observed in three (6%) patients (1.5% of cycles). Two (4%) patients had grade 3–4 infections without neutropenia (1% of cycles).

Table 6. NCI CTC adverse events related to the study drug.

  No. of evaluable pts (%) No. of evaluable cycles (%)
  No=51
N=197*
Adverse events Overall incidence Grade 3 Grade 4 Overall incidence Grade 3 Grade 4
Haematological*            
Anaemia 46 (90) 7 (14) 169 (86) 10 (5)
Leucopenia 43 (84) 14 (28) 9 (18) 152 (78) 41 (21) 12 (6)
Neutropenia 42 (82) 16 (31) 18 (35) 144 (74) 43 (22) 39 (20)
Thrombocytopenia 22 (43) 3 (6) 77 (39) 4 (2)
Febrile neutropenia 5 (10) 4 (8) 1 (2) 5 (3) 4 (2) 1 (1)
Infection            
Infection+G 3/4 neutropenia 3 (6) 2 (4) 1 (2) 4 (2) 2 (1) 1 (1)
Infection without neutropenia 7 (14) 2 (4) 10 (5) 2 (1)
Nonhaematological gastrointestinal            
Nausea 19 (37) 2 (4) 36 (18) 2 (1)
Vomiting 13 (226) 3 (6) 23 (12) 3 (2)
Constipation 33 (65) 3 (6) 1 (2) 63 (32) 3 (25) 1 (1)
Anorexia 4 (8) 1 (2) 27 (14)
Dehydration 13 (26) 4 (2) 1 (1)
Dysphagia/oesophagitis 2 (4) 1 (2) 3 (2) 1 (1)
Stomatitis 17 (33) 3 (6) 34 (17) 3 (2)
Flu-like symptoms            
Fatigue 34 (67) 5 (10) 93 (47 6 (3)
Pain            
Abdominal pain 19 (37) 4 (8) 32 (16) 6 (3)
Bone pain 6 (12) 2 (4) 9 (5) 2 (1)
Myalgia 9 (186) 2 (4) 15 (8) 2 (1)
Pain-other 4 (8) 5 (3)
Neurological            
Syncope 1 (2) 1 (2) 1 (1) 1 (1)
Neuropathy-sensory 4 (8) 6 (3)
Dermatological            
Alopecia 20 (39) NA NA 83 (42) NA NA
Injection site reaction 2 (4) 3 (2)
Weight loss 10 (20) 1 (2) 35 (18) 4 (2)
*

One cycle was not evaluable for haematological toxicity.

Nonhaematological toxicities were manageable. Only 4% of patients experienced grade 3 nausea and only 6% of patients experienced grade 3 vomiting. In all, 141 cycles (72%) were administered with prophylactic use of antiemetics according to institution protocol. Among the 28% of cycles without prophylactic antiemetics, neither severe nausea nor vomiting was observed.

Constipation occurred in 65% but was grade 3 in three patients (6%) and grade 4, in only one (2%). Among these four patients there was a strong association with previous abdominal surgery and concomitant treatment with opioids and 5HT3 antagonists. No cumulative effect was seen for constipation. Prophylactic laxative therapy helped to reduce the incidence of this complication. Grade 3 myalgia and fatigue were observed in only 4 and 10% of patients, respectively (1 and 3% of cycles). Grade 3–4 sensory neuropathy was not observed and the overall incidence of grade 1–2 toxicity was very low (8%) as were injection site reactions – two patients (4%) had grade 1 or 2 injection site reactions related to vinflunine.

At baseline, 10 patients (20%) had grade 1 elevation of renal function tests, which increased to grade 2 in one patient (Table 7). Despite frequent baseline involvement of the liver by disease, grade III–IV elevations of liver function tests were infrequent.

Table 7. Renal and liver function changes on treatment.

Laboratory test No. of evaluable pts Overall incidence (any grade) Grade 3 Grade 4
Serum creatinine 50 11 (22)
Bilirubin 51 3 (6) 1 (2) 1 (2)
SGOT/AST 48 12 (25) 1 (2)
SGPT/ALT 49 13 (27) 1 (2)
Alkaline phosphatase 49 25 (51) 5 (10)

DISCUSSION

The treatment of relapse following systemic chemotherapy for advanced or metastatic TCC is problematical. A variety of agents have been studied including ifosfamide, taxanes, oxaliplatin, pemetrexed and bortezomib and the results are summarised below.

Ifosfamide had been studied in the past, and its phase II results in previously treated patients (not all platinum pretreated) have been somewhat inconsistent with response rates of 1 and of 20% in two studies (Pronzato et al, 1997; Witte et al, 1997). Be that as it may, its use has become less frequent, due to the renal toxicity of the compound, a particular problem with bladder carcinoma patients who have received prior platinum.

A review of the recent literature concerning phase II trials in this population confirms that very limited options exist for patients who have been previously treated with gemcitabine/platinum, M-VAC or CMV combinations (Table 8). The taxanes (paclitaxel and docetaxel) have been studied in this setting, and are frequently used in clinical practice, as they have yielded objective response rates of 5–13% with response durations of 3.0–7.4 months. Severe myelosuppression (for docetaxel) and peripheral neurotoxicity (for paclitaxel) are the most common side effects. Unfortunately, when brought forward to the first-line setting, a combination of docetaxel and cisplatin was proven inferior to M-VAC (Bamias et al, 2004), whereas similar randomised paclitaxel/platinum combination trials were abandoned for poor accrual (Dreicer et al, 2004).

Table 8. Recent phase II trials of single agents in previously treated bladder cancer.

Drug Author (ref.) No. of pts Evaluable pts CR PR % Duration (months) TTP (months) OS (months)
Paclitaxel Vaughn (2002) 31 31 3 10   2.2 7.2
  Papamichael (1997) 14 14   1 7 7.4    
  Joly (2004) 45 37 2 5 3.0    
Docetaxel McCaffrey (1997) 30 30 4 13 4.0   9.0
Oxaliplatin Moore (2003) 20 18 1 6      
Lapatinib Wulfing (2005) 59 59 2 3      
Bortezomib Sridhar (2005) 18 11 0      
Pemetrexed Sweeney (2003) 47 47 3 10 28 3.0   9.8

Recent trials with a novel platinum analogue (oxaliplatin), a dual targeted tyrosine kinase inhibitor (lapatinib) and a proteasome inhibitor (bortezomib) have yielded unimpressive results. Interesting results have been obtained with the multitargeted folate inhibitor pemetrexed, which demonstrated a high response rate of 28%, including complete responses, although of a seemingly short duration. The compound has been also studied in the first-line setting as a single agent or in combination with gemcitabine, yielding objective response rates of 33% and of 27%, respectively. Main side effects consisted of fatigue and myelosuppression. Studies have also evaluated combinations of chemotherapy and biological agents, for example, gemcitabine has been studied in combination with the farnesyl transferase inhibitor SCH66336 in the second-line treatment of patients with advanced urothelial tract cancer. Nine partial responses and one complete response were achieved in 31 assessable patients and corresponded to an overall response rate of 32.3% (95% CI: 17–51%) (Theodore et al, 2005). Further evaluation of combinations of this sort is clearly warranted.

The results obtained with vinflunine suggest that this compound could be among the most active agents available in this setting. The level of antitumour activity observed must be interpreted in view of the poor prognosis of the population studied, with a universal prior platinum-containing pretreatment a large proportion had had prior vinca alkaloid exposure, and the frequent presence of extensive visceral disease involvement at trial entry.

Although vinflunine exerted some severe toxicity (most importantly myelosup ion and constipation), these side effects appeared to be mostly manageable. A positive aspect of vinflunine for patients with advanced bladder cancer is its reduced potential for renal toxicity and its low level of peripheral neurotoxicity, which do not overlap with the known cisplatin side effects. Renal impairment has been reported as the most important factor preventing up to 40% of the patients with TCC of the bladder from receiving active, cisplatin-containing treatment (Dash et al, 2005).

In conclusion, the results of the present study demonstrate that vinflunine has clinically relevant activity with acceptable toxicity in the treatment of patients with TCC of the bladder who have failed prior platinum-containing systemic chemotherapy. Further investigation of vinflunine in advanced or metastatic TCC of urothelium tract is warranted, and a phase III trial in the second-line treatment of the disease has begun. In addition, the exploration of the role of the compound in patients with earlier stages of disease and/or renal function impairment is also of interest.

Acknowledgments

We acknowledge Professor S Johnson, Musgrove Park Hospital, Taunton (UK), Dr S Hill, Pierre Fabre Ltd, UK, JC Pouget, Biostatistics, Pierre Fabre Médicament (France) for their help in the preparation of this manuscript. Supported by Institut de Recherche Pierre Fabre, Boulogne-Billancourt, France.

Previously presented in part as:

Bui B, Theodore C, Culine S De Santis M, Demkow T, Lorenz J, Rolland F, Fabry F, Pouget JC, James N (2003) Preliminary results of a phase II study testing intravenous (IV) vinflunine as second line therapy in patients with advanced transitional cell cancer (TCC) of the bladder. Proc Am Soc Clin Oncol 22: abs 1571.

Culine S, Theodore C, De Santis M, Demkow T, Lorenz J, Rolland F, Fabry F, Pouget JC, James N (2003) A phase II study testing intravenous (IV) vinflunine as second line therapy in patients with advanced transitional cell cancer (TCC) of the bladder. Eur J Oncol 5: abs 844.

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