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Clinical Trial Summary

Paclitaxel (Taxol, Bristol-Meyers Squibb) has been shown to be very effective against metastatic breast cancer, as well as other cancers. Because the Taxol formulation of paclitaxel is dissolved in Cremophor, an organic solvent containing castor oil, and ethanol, prolonged intravenous administration times are required; and because the solvent has caused hypersensitivity reactions, a premedication schedule is required. ABI-007 is a new anticancer medication containing the same active ingredient as Taxol, paclitaxel, but formulated as a protein-stabilized material that is suspended in salt water and administered intravenously. The time of administration is reduced, the dose of paclitaxel can be higher than is safe for Taxol, and there is no premedication required.

This study will determine the efficacy of this new formulation of paclitaxel, as compared to Taxol, for patients with metastatic breast cancer.

This is an open label comparative study, so patients will be randomly assigned to receive either the Taxol or ABI-007 forms of paclitaxel, but will know what medication they are receiving. Treatment will be repeated every three weeks unless adverse events or treatment failure require discontinuing study medication.


Clinical Trial Description

Taxol (Bristol-Meyers Squibb) is active against carcinomas of the ovary, breast, lung, esophagus and head and neck. A number of dose schedules of Taxol have been tested in breast cancer. Initial trials used 250 mg/m2 as a continuous infusion over 24 hours. Subsequently, shorter infusions of Taxol over three hours were tested at a dose of 175 mg/m2, with response rates of 30%-40%. Phase II studies using higher doses of Taxol at 200-250 mg/m2 had a response rate of 56% in metastatic breast cancer patients. However, at these doses, significant toxicities occurred, including neuropathy. There was a median granulocyte count nadir at 100-200 cells/mm3 for the majority of courses administered. There were also significant side effects associated with hypersensitivity to the Taxol vehicle, Cremophor-EL. These hypersensitivity reactions require a premedication schedule that includes a corticosteroid, an H2 antagonist and an antihistamine.

Abraxis BioScience is testing a reformulated form of paclitaxel without Cremophor. This formulation is a protein-stabilized, nanoparticle suspension of paclitaxel and human serum albumin in normal saline. The potential advantages of this formulation are:

- Higher tolerated doses, with greater efficacy

- Longer drug persistence in tumor as a result of the nanoparticle formulation

- Reduced infusion time

- Reduced risk of hypersensitivity with no required premedication schedule

- More rapid distribution of paclitaxel to the tissues based on pharmacokinetic data

This study will evaluate ABI-007, as compared to Taxol, in patients with metastatic breast cancer. ;


Study Design

Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment


Related Conditions & MeSH terms


NCT number NCT00046527
Study type Interventional
Source Celgene Corporation
Contact
Status Completed
Phase Phase 3
Start date June 2001

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