A Phase I Study of Infusional Paclitaxel With the P-Glycoprotein Antagonist PSC 833

Summary

This is a dosage escalation study to estimate the maximum tolerated dose of drug resistance inhibitor PSC 833 given in combination with paclitaxel. Groups of 3 to 6 patients receive continuous-infusion paclitaxel for 5 days and oral PSC 833 for 6-7 days, following paclitaxel on the first course, then beginning 3 days prior to paclitaxel on subsequent courses. Stable and responding patients are re-treated every 21 days, with paclitaxel dose adjusted to maintain an absolute neutrophil count less than 500 for no more than 4 days.

Timeline

Start

1994-03

Primary completion

—

Completion

2001-01

Publications

• Background Boote DJ, Dennis IF, Twentyman PR, Osborne RJ, Laburte C, Hensel S, Smyth JF, Brampton MH, Bleehen NM. Phase I study of etoposide with SDZ PSC 833 as a modulator of multidrug resistance in patients with cancer. J Clin Oncol. 1996 Feb;14(2):610-8. doi: 10.1200/JCO.1996.14.2.610.

Drugs

Indications