Metastatic Breast Cancer Clinical Trial
Official title:
Phase II Study of Tailored-Dose Docetaxel in Metastatic Breast Cancer
This is a research study which aims to improve the way that doctors determine the dose of chemotherapy given to patients. Right now, chemotherapy is determined by a patient's height and weight. However, some patients metabolize chemotherapy faster or slower than the average person because of a different level of drug metabolizing enzyme in the liver. Therefore, some patients are either given too small or too large a dose of chemotherapy because the amount of enzyme is not taken into account. This research study will examine the use of a simple test, call the Erythromycin Breath Test(ERMBT) to determine the amount of enzyme which can metabolize the chemotherapy drug docetaxel (Taxotere). The dose of docetaxel will be tailored to the amount of enzyme which is available to metabolize the drug for each patient.
This is a research study which aims to improve the way that doctors determine the dose of
chemotherapy given to patients. Right now, chemotherapy is determined by a patient's height
and weight. However, some patients metabolize chemotherapy faster or slower than the average
person because of a different level of drug metabolizing enzyme in the liver. Therefore,
some patients are either given too small or too large a dose of chemotherapy because the
amount of enzyme is not taken into account. This research study will examine the use of a
simple test, call the Erythromycin Breath Test(ERMBT) to determine the amount of enzyme
which can metabolize the chemotherapy drug docetaxel (Taxotere). The dose of docetaxel will
be tailored to the amount of enzyme which is available to metabolize the drug for each
patient. Patients participating in this study will have biopsy proven, measurable metastatic
breast cancer.
During the study:
-Patients will receive tailored-dose docetaxel for their breast cancer.
Approximately 45 subjects will be recruited at this site.
Diagnosis and Staging
•All patients will have primary tumor measurements by physical exam and/or radiographic
studies (CT, MRI, bone scan).
Erythromycin Breath Test* •The ERMBT will be administered in the outpatient setting, prior
to the first cycle of docetaxel. Twenty minutes after the injection of a trace amount of
(14C N-methyl) erythromycin, (This test assesses the activity of the cytochrome P450 enzyme
which is largely responsible for the metabolism of the chemotherapeutic agent
docetaxel.)patients will exhale through a tube creating bubbles in a solution of hyamine
hydroxide, ethanol, and a blue indicator until 2 mmol of carbon dioxide has been trapped and
the blue color vanishes.
Premedications
- Dexamethasone 8 mg po bid for three days, beginning the day prior to docetaxel
administration.
- Diphenhydramine 50 mg IVPB
- Granisetron 2 mg po 30 minutes pre-docetaxel
Chemotherapy
- Docetaxel, tailored dose, to be infused over 1 hour on day 1 every 3 weeks for the
duration of study.
- Starting dose of docetaxel to be determined by the ERMBT and serum albumin according to
formula as stated in protocol (page 11).
Suggested post-chemotherapy antiemetics:
•Compazine 10 mg po q 6 hours prn nausea/vomiting
Pharmacokinetic Analysis
•All patients will have pharmacokinetic determination with blood drawn for pharmacokinetic
analysis over a 24 hour period after the first docetaxel treatment. Time points include time
0, 15 minutes, 45 minutes, 180 minutes (3 hours), 390 minutes (6.5 hours), and 1440 minutes
(24 hours).
DEXA Scan*
- DEXA scan will be performed during the patient's stay in the Clinical Research Center,
on the Lunar DPXL Bone Densitometer. This is a very simple and noninvasive test which
uses x-rays and a computer program to analyze the ratio of 38 keV to 70 keV
attenuation. The program then calculates Fat and Lean values for the arms, legs,
abdomen, ribs, and the total body. This is the same test that is in widespread clinical
use for the evaluation of osteoporosis. During the DEXA scan, patients will be exposed
to a trace amount of radiation which is equal to about 2% of the yearly background
dose, or less.
*The amount of radiation to be administered by the erythromycin breath test and DEXA
scan is not medically significant.
- After the first dose of docetaxel, patients will receive docetaxel every 3 weeks
How long a patient continues on chemotherapy will be decided by both the patient and the
doctor. If a patient is responding to docetaxel, typically they receive 6-8 doses.
;
Allocation: Non-Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment
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