The purpose of this research is to try to identify which women who take tamoxifen are likely to suffer from hot flashes or are more likely to have other side effects or benefits from the drug. The researchers will do so by determining whether there are mutations that normally occur in human DNA that might influence the way individuals respond to medications...
Date First Received: September 27, 2005
Last Updated: September 24, 2008
Verified by: National Institute of General Medical Sciences (NIGMS), November 2007
Clinical Trial Phase: Phase 4 | Start Date: September 2002
Overall Status: Completed
Estimated Enrollment: 297
Brief Summary
Official Title: “A Pilot Trial Correlating Metabolic Profile of Tamoxifen With Pharmacogenetic Predictors and Clinical Effects”
Condition Keyword(s):
Intervention(s):
The purpose of this research is to try to identify which women who take tamoxifen are likely to suffer from hot flashes or are more likely to have other side effects or benefits from the drug. The researchers will do so by determining whether there are mutations that normally occur in human DNA that might influence the way individuals respond to medications.
Study Type: Observational
Study Design: Cohort, Prospective
Detailed Clinical Trial Description
The study will test the following hypotheses.
1. There is a relationship between genetically distinct metabolic profiles of tamoxifen and the frequency and severity of hot flashes in women on chronic tamoxifen therapy.
2. Genetically distinct metabolic profiles for tamoxifen effect lipid profile, bone turnover metabolites and bone mineral density, and coagulation factors.
3. Different genetic profiles of estrogen responsive genes influence the pharmacodynamic effects of tamoxifen in cardiovascular system.
Intervention(s) in this Clinical Trial
- Drug: Tamoxifen (pharmacodynamic analysis)
- Tamoxifen 20mg po daily
Criteria for Participation in this Clinical Trial
Inclusion Criteria:
- 1. 18-years or older
- 2. Women with a prior breast cancer or who are at a high risk for developing the disease and about to start tamoxifen therapy.
- 3. Participants must not be treated with concomitant chemotherapy or hormone therapy other than tamoxifen. They must not have ovarian ablation or currently being treated with radiation therapy and/or chronic corticosteroids.
- 4. The participant must not be taking anti-hot flash therapy (clonidine, bellergal, megestrol acetate). Vitamin E, selective serotonin reuptake inhibitors, or herbal remedies are allowed provided that the participant has been taking the remedy for at least 4 weeks and intends to continue the remedy for at least the first month while on the study, and allows for one-month follow up evaluation (hot flash diaries and blood samples).
- 5. The participant must not be pregnant or lactating.
- 6. The participant is able and willing to sign an informed consent.
Gender Eligibility for this Clinical Trial: Female
Minimum Age for this Clinical Trial: 18 Years
Maximum Age for this Clinical Trial: 70 Years
Are Healthy Volunteers Accepted for this Clinical Trial?: No
Clinical Trial Sponsor Information
Lead Sponsor: National Institute of General Medical Sciences (NIGMS)
Overall Clinical Trial Officials and Contacts
David Flockhart, MD, PhD Principal Investigator Indiana University School of Medicine
Related Publications
Citations Reporting Results
Rae JM, Goetz MP, Hayes DF, Ingle JN, Li L, Storniolo AM, Stearns V, Flockhart DA. CYP2D6 genotype and tamoxifen response. Breast Cancer Res. 2005 Jul 29;7(5):E6. No abstract available.
Lim YC, Desta Z, Flockhart DA, Skaar TC. Endoxifen (4-hydroxy-N-desmethyl-tamoxifen) has anti-estrogenic effects in breast cancer cells with potency similar to 4-hydroxy-tamoxifen. Cancer Chemother Pharmacol. 2005 May;55(5):471-8. Epub 2005 Feb 1.
Jin Y, Desta Z, Stearns V, Ward B, Ho H, Lee KH, Skaar T, Storniolo AM, Li L, Araba A, Blanchard R, Nguyen A, Ullmer L, Hayden J, Lemler S, Weinshilboum RM, Rae JM, Hayes DF, Flockhart DA. CYP2D6 genotype, antidepressant use, and tamoxifen metabolism during adjuvant breast cancer treatment. J Natl Cancer Inst. 2005 Jan 5;97(1):30-9.
Stearns V, Johnson MD, Rae JM, Morocho A, Novielli A, Bhargava P, Hayes DF, Desta Z, Flockhart DA. Active tamoxifen metabolite plasma concentrations after coadministration of tamoxifen and the selective serotonin reuptake inhibitor paroxetine. J Natl Cancer Inst. 2003 Dec 3;95(23):1758-64.
Lee KH, Ward BA, Desta Z, Flockhart DA, Jones DR. Quantification of tamoxifen and three metabolites in plasma by high-performance liquid chromatography with fluorescence detection: application to a clinical trial. J Chromatogr B Analyt Technol Biomed Life Sci. 2003 Jul 5;791(1-2):245-53.
Additional Information
Information obtained from ClinicalTrials.gov on October 06, 2008
Link to the current ClinicalTrials.gov record. http://clinicaltrials.gov/show/NCT00228930
Study ID Number: 0208-14
ClinicalTrials.gov Identifier: NCT00228930
Health Authority: United States: Federal Government
The Division of Clinical Pharmacology, Indiana University
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