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Annals of Oncology 13:125-134, 2002
© 2002 European Society for Medical Oncology

A 20% dose reduction of the original CISCA/VB regimen allows better tolerance and similar survival rate in disseminated testicular non-seminomatous germ-cell tumors: final results of a phase III randomized trial

K. Fizazi1,+,§, K.-A. Do1, X. Wang1, L. Finn1, C. J. Logothetis1 and R. J. Amato2

1Department of Genitourinary Medical Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, Texas; 2Scott Department of Urology, Baylor College of Medicine, Houston, Texas, USA

Received 6 April 2001; revised 2 August 2001. accepted 24 August 2001.

Background: This prospective randomized clinical trial was designed to compare the efficacy of a low-dose regimen of cisplatin, doxorubicin and cyclophosphamide alternated with vinblastine and bleomycin (CISCA/VB) with the original CISCA/VB regimen in patients with disseminated non-seminomatous germ-cell tumors (NSGCT) and a predicted favorable outcome.

Patients and methods

One hundred and twenty-five patients with disseminated NSGCT and a predicted favorable outcome according to the M.D. Anderson Cancer Center classification [testicular primary and human chorionic gonadotropin (hCG) serum level <50 000 mIU/ml] were randomized to receive the original CISCA/VB regimen (100% dose) or a low-dose CISCA/VB regimen (80% dose).

Results

Among the 124 eligible patients, there was no significant difference in the number of patients in the two treatment arms who achieved a complete response to therapy: 53 of 65 patients (82%) on the original CISCA/VB regimen and 53 of 59 patients (90%) on the low-dose CISCA/VB regimen (P = 0.29). Overall, the original CISCA/VB regimen resulted in a significantly higher relative dose intensity (P <0.0001). After a median follow-up of 6.8 years (range 0.37 to 12.94 years), there was no significant difference in disease-free survival (P = 0.87) or in overall survival (P = 0.88) between the two treatment arms. The 5-year overall survival rate was 93.7% [95% confidence interval (CI) 88% to 100%] and 94.1% (95% CI 84% to 100%) in the original CISCA/VB arm and the low-dose CISCA/VB arm, respectively. The 5-year overall survival rate for the entire study population was 98% (95% CI 94% to 100%) and 88% (95% CI 76% to 100%) in the good- and intermediate-prognosis groups, respectively, as defined by the International Germ Cell Consensus Classification Group (IGCCCG). The low-dose CISCA/VB regimen resulted in significantly less neutropenic fever (P <0.001), grade 4 thrombocytopenia (P <0.03) and severe mucositis (P <0.01) than the original CISCA/VB regimen.

Conclusions

CISCA/VB is highly efficient in patients with good or intermediate prognosis NSGCT according to the IGCCCG criteria. Although equivalent antitumor efficacy cannot be claimed, the low-dose CISCA/VB regimen appears to be a better mode of delivery than the original CISCA/VB regimen with respect to toxicity, since survival is comparable.

Key words: chemotherapy, germ-cell tumors, randomized trial


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