Abstract
Purpose
Flavopiridol is a cyclin-dependent kinase inhibitor that prevents cell cycle progression and tumor growth. In initial phase I studies, encouraging responses were seen in advanced renal cell cancer (RCC). In a phase II study of flavopiridol given as a 72-h continuous infusion every 2 weeks in RCC, a response rate of 6% was seen but with considerable grade 3 or 4 asthenia, diarrhea, and thrombosis. Subsequently, an alternative 1-h bolus schedule was reported to have enhanced tolerability in a phase I trial. We therefore conducted a phase II study of this bolus regimen.
Methods
A total of 38 patients with advanced RCC were entered into this multi-institutional phase II study. Flavopiridol (50 mg/m2 per day) was administered by bolus intravenous injection daily for three consecutive days, repeated every 3 weeks.
Results
Out of 34 eligible patients, one complete response and three partial responses were observed, for an overall response rate of 12% (95% CI 3–27%). Of the 34 patients, 14 (41%) had stable disease (SD). The probability of not failing treatment by 6 months was 21% (95% CI 9–35%). Median overall survival time was 9 months (95% CI 8–18 months). The most common grade 3 or 4 toxicities were diarrhea (35%) and tumor pain (12%) along with anemia, dyspnea, and fatigue (9% each).
Conclusions
Flavopiridol at this dose and schedule is feasible with an acceptable toxicity profile. Flavopiridol has some modest biologic activity against advanced RCC, as evidenced by its single-agent objective response and SD rates.
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We thank Dr. Catherine Tangen, PhD, for statistical advice and comments on this manuscript.
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Van Veldhuizen, P.J., Faulkner, J.R., Lara, P.N. et al. A phase II study of flavopiridol in patients with advanced renal cell carcinoma: results of Southwest Oncology Group Trial 0109. Cancer Chemother Pharmacol 56, 39–45 (2005). https://doi.org/10.1007/s00280-004-0969-9
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DOI: https://doi.org/10.1007/s00280-004-0969-9