Tamoxifen Pharmacokinetics and CYP2D6 Polymorphisms in Asian Women With Hormone Receptor Positive Breast Cancer

April 2, 2012 updated by: National University Hospital, Singapore

We hypothesized that subjects with CYP2D6*10 alleles may have a lower steady state levels of endoxifen due to reduced conversion of tamoxifen to endoxifen.

Primary objectives:

  • To determine the steady state pharmacokinetics of tamoxifen and its metabolites
  • To test the effects of genetic polymorphisms of CYP2D6 on plasma concentration of tamoxifen and its metabolites in hormone receptor positive women who are taking tamoxifen as adjuvant treatment for breast cancer.

Study Overview

Status

Completed

Conditions

Study Type

Observational

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Singapore
      • Singapore, Singapore
        • National University Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

Female

Sampling Method

Probability Sample

Study Population

We aim to enroll 200 patients onto our study over a period of 2 years. Patients will be recruited from the oncology outpatient clinic in National University Hospital. Participation in the study will be strictly voluntary and written informed consent will be obtained from all subjects according to institutional and governmental guidelines. Consent will be obtained by attending doctors or co-investigators of the study prior to blood sampling.

Description

Inclusion Criteria:

  • Signed informed consent.
  • At least 18 years of age.
  • On tamoxifen for at least 3 months for adjuvant therapy.
  • On a stable diet for past 1 week before blood sampling.
  • Compliant with tamoxifen medication.
  • Completed adjuvant chemotherapy and/or adjuvant radiation therapy.

Exclusion Criteria:

• Patients should not be on the list of medications for the last 1 week before accrual to the study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure
To determine the steady state pharmacokinetics of tamoxifen and its metabolites
To test the effects of genetic polymorphisms of CYP2D6 on plasma concentration of tamoxifen and its metabolites in hormone receptor positive women who are taking tamoxifen as adjuvant treatment for breast cancer.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National University Hospital, Singapore

Investigators

  • Principal Investigator: Chiung Ing Wong, MRCP, MB ChB, National University Hospital, Singapore

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

November 1, 2005

Study Registration Dates

First Submitted

July 14, 2008

First Submitted That Met QC Criteria

July 15, 2008

First Posted (Estimate)

July 16, 2008

Study Record Updates

Last Update Posted (Estimate)

April 3, 2012

Last Update Submitted That Met QC Criteria

April 2, 2012

Last Verified

April 1, 2012

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • BR02/06/06

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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