Clinical Outcomes After Letrozole Treatment According to the Estrogen Receptor Expression in Postmenopausal Women (LETTER)

May 10, 2011 updated by: Korean Breast Cancer Study Group

Assessment of Clinical Outcomes After Letrozole Treatment According to the Estrogen Receptor Expression in Postmenopausal Women With Hormone Receptor Positive Breast Cancer

The purpose of this study is to assess clinical outcomes after Letrozole treatment according to the estrogen receptor expression in postmenopausal women with hormone receptor positive breast cancer.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Unknown

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Detailed Description

This study aimed at evaluating following:

  1. Validity Assessment:

    1. Primary End Point: To evaluate 5-year diseae free survival rate after Letrozole treatment according to the estrogen receptor expression in postmenopausal women
    2. Secondary End Point: To evaluate overall survival rate(OS) and Time to distance recurrence(TTDR) after Hormonal therapy in postmenopausal women with hormone receptor positive breast cancer
  2. Safety Assessment: To evaluate all adverse events including serious adverse events after Letrozole treatment.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Anticipated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
876

Contacts and Locations

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

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

Female

Sampling Method

Non-Probability Sample

Study Population

Patients recruited into the study are postmenopausal women with estrogen receptor positive breast cancer.

Description

Inclusion Criteria:

  1. Patients with estrogen receptor(+) and/or progesterone receptor(+)

  2. Postmenopausal state was defined the following conditions, at least one of a, b

    1. Serum FSH ≥ 30 mIU/mL and Amenorrhea ≥ 1 year for below 55 years, over than 55 years
    2. Bilateral oophorectomy
  3. Patients have undergone surgery of the breast cancer within 12 weeks and terminated chemotherapy after surgery within 4 weeks.
  4. WHO(ECOG) performance status 0-2
  5. Adequate haematological function, renal function, hepatic function.
  6. No evidence of metastasis.

Exclusion Criteria:

  1. Metachronous bilateral breast cancer.
  2. Metastatic breast cancer (stage IV)
  3. Other hormone therapy and Hormonal replacement therapy given within the previous 4 weeks, except for Estring, Vagifem, Estrogen Cream.
  4. Patients with Child-Pugh grade C, serum creatinine>2xUNL
  5. Patients with gastrectomy, small bowel resection, malabsorption syndrome and dysphagia.

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

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
ER expression : Low
Patients were postmenopausal women with hormone receptor positive breast cancer. All patients should be 3 or 4 point of total Allred score.
ER expression : Intermediate
Patients were postmenopausal women with hormone receptor positive breast cancer. All patients should be 5 or 6 point of total Allred score.
ER expression : High
Patients were postmenopausal women with hormone receptor positive breast cancer. All patients should be 7 or 8 point of total Allred score.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
Disease free survival
Time Frame: the first 5 years after enrollment
the first 5 years after enrollment

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
Adverse effect
Time Frame: the first 5 years after enrollment
the first 5 years after enrollment
Overall Survival
Time Frame: the first 5 years after enrollment
the first 5 years after enrollment
Time to Distant Recurrence (TTDR)
Time Frame: the first 5 years after enrollment
the first 5 years after enrollment

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Korean Breast Cancer Study Group

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Joon Jeong, MD, Department of Surgery, Gangnam Severance Hospital, South Korea

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 1, 2010

Primary Completion (Anticipated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
January 1, 2017

Study Completion (Anticipated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
January 1, 2017

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
February 14, 2010

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
February 16, 2010

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
February 17, 2010

Study Record Updates

Last Update Posted (Estimate)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
May 11, 2011

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 10, 2011

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
May 1, 2011

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • KBCSG006

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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