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A dose-finding, pharmacokinetic and pharmacodynamic study of a novel schedule of flavopiridol in patients with advanced solid tumors

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Summary

Purpose: Based on the promising activity and tolerability of flavopiridol administered with a pharmacokinetically-derived dosing schedule in chronic lymphocytic leukemia (CLL), we conducted a phase I study using this schedule in patients with advanced solid tumors. Experimental Design: Flavopiridol was given IV as a 30-min loading dose followed by a 4-hr infusion weekly for 4 weeks repeated every 6 weeks. Dose-escalation was in cohorts of three patients using the standard 3+3 phase I study design. Blood samples were obtained for pharmacokinetic and pharmacodynamic studies. Results: Thirty-four eligible patients with advanced solid tumors received a total of 208 doses (median 7, range 1–24). Total doses ranged from 40 to 105 mg/m2. The primary dose limiting toxicity was cytokine release syndrome (CKRS). No antitumor responses were observed. The mean peak plasma concentration across all doses was 1.65 ± 0.86 μM. Area under the concentration-versus-time curve (\( {\hbox{AU}}{{\hbox{C}}_{0 - \infty }} \)) ranged from 4.31 to 32.2 μM⋅hr with an overall mean of 13.6 ± 7.0 μM⋅hr. Plasma flavopiridol concentrations and AUC increased proportionally with dose. There was no correlation between cytokine levels and clinical outcomes. Conclusions: The maximum-tolerated dose of flavopiridol is 20 mg/m2 bolus followed by 20 mg/m2 infusion over 4 h given weekly for 4 weeks on a 6-week cycle in patients with advanced solid tumors. Flavopiridol PK was notably different, and there was a higher frequency of CKRS, despite prophylactic steroids, seen in this patient group compared to previous studies with CLL using a similar dosing schedule.

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Acknowledgements

This work was supported by Grant No. U01 CA76576 from the National Cancer Institute.

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Correspondence to Manisha H. Shah.

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Ramaswamy, B., Phelps, M.A., Baiocchi, R. et al. A dose-finding, pharmacokinetic and pharmacodynamic study of a novel schedule of flavopiridol in patients with advanced solid tumors. Invest New Drugs 30, 629–638 (2012). https://doi.org/10.1007/s10637-010-9563-7

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