Breast CancerNCT00717015
Tamoxifen Pharmacokinetics and CYP2D6 Polymorphisms in Asian Women With Hormone Receptor Positive Breast Cancer
An observational study of Breast Cancer, run by National University Hospital, Singapore at 1 site in Singapore.
Trial summary
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… Read more about this study
- Who is it for?
- Ages 18 years and older, women only
- Conditions the study is for
- Breast Cancer
- How many people
- Not given
- Where
- 1 siteSingapore
- Study dates
- Nov 2005to not given
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- Women only
- No healthy volunteers
- Adult, Older adult
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.
Who may be able to join
- 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.
Who cannot join
- Patients should not be on the list of medications for the last 1 week before accrual to the study
Trial locations and contacts
1 site in 1 country.
About this study
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.
- Conditions
- Breast Cancer
- Keywords
- Hormone Receptor Positive Breast Cancer
- Medical subject headings
- Breast Neoplasms
What is being measured
The primary outcome is the main question the study is designed to answer.
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.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted16 Jul 2008 (estimated)
- Study startNov 2005
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Breast CancerStudies of the same condition, open and under way.
- More trials run by National University Hospital, SingaporeThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case crossover
- Time perspective
- Cross-sectional
Sponsor and investigators
- Lead sponsor
- National University Hospital, Singapore
- Sponsor type
- University, hospital or other
- Investigators
- Chiung Ing Wong, MRCP, MB ChB, Principal investigator, National University Hospital, Singapore
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00717015
- Sponsor's protocol ID
- BR02/06/06
- Status last verified
- Apr 2012
- First submitted
- 14 Jul 2008
- Last updated
- 3 Apr 2012
- Results posted
- No
Study at a glance
From the registry record, last updated by the sponsor on 3 Apr 2012. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Tamoxifen Pharmacokinetics and CYP2D6 Polymorphisms in Asian Women With Hormone Receptor Positive Breast Cancer
- ClinicalTrials.gov ID
- NCT00717015
- Acronym / sponsor ID
- BR02/06/06
- Conditions
- Breast Cancer
- Keywords
- Hormone Receptor Positive Breast Cancer
- Study type
- Observational
- Recruitment status
- Completed
- Lead sponsor
- National University Hospital, SingaporeUniversity, hospital or other
- Study start
- Nov 2005
- First posted
- 16 Jul 2008 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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 design
- Observational model
- Case crossover
- Time perspective
- Cross-sectional
Who may qualify
- Ages
- 18 years and older
- Sex
- Female only
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- 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.
Key inclusion criteria (6 listed)
- 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.
Key exclusion criteria (1 listed)
- Patients should not be on the list of medications for the last 1 week before accrual to the study
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
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.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 3 Apr 2012.
Related trials for Breast Cancer
Active, not recruiting
Streamlined Geriatric and Oncological Evaluation Based On IC Technology
Breast Cancer, Comorbidities and Coexisting Conditions
RecruitingPhase 2
Gene Signatures to Guide HR+MBC Therapy in a Diverse Cohort
Invasive Mammary Carcinoma, Metastatic Breast Cancer
Not yet recruitingObservational study
Comparison of Reliability, Time Cost, and Participant Comfort of Lymphedema Assessments in Upper Extremity
Lymphedema, Upper Extremity Lymphedema
RecruitingPhase 3
A Study of Camrelizumab Plus Chemotherapy in Combination With or Without Famitinib as Neoadjuvant Therapy in Participants With Triple Negative Breast Cancer (BCTOP-T-N01)
TNBC - Triple-Negative Breast Cancer
RecruitingPhase 3
Testing Whether Hormone Therapy With Ribociclib is as Effective as Chemotherapy Followed by Hormone Therapy With Ribociclib for the Treatment of High Anatomic Stage Breast Cancer With Low Recurrence Risk, The RxFINE-Low Trial
Anatomic Stage II Breast Cancer AJCC v8, Anatomic Stage IIIA Breast Cancer AJCC v8
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Chiung Ing Wong, MRCP, MB ChB principal investigator
National University Hospital, Singapore
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Breast Cancer, run by National University Hospital, Singapore at 1 site in Singapore.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 6 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 3 Apr 2012. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Singapore. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
To determine the steady state pharmacokinetics of tamoxifen and its metabolites. The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 3 Apr 2012.