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Letrozole in Treating Women With Primary Breast Cancer Who Have Received 5 Years of Aromatase Inhibitor Therapy

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ClinicalTrials.gov Identifier: NCT00754845
Recruitment Status : Completed
First Posted : September 18, 2008
Results First Posted : November 19, 2018
Last Update Posted : November 19, 2018
Sponsor:
Collaborators:
Eastern Cooperative Oncology Group
North Central Cancer Treatment Group
Southwest Oncology Group
Alliance for Clinical Trials in Oncology
Information provided by (Responsible Party):
Canadian Cancer Trials Group

Brief Summary:

RATIONALE: Estrogen can cause the growth of breast cancer cells. Hormone therapy using letrozole may fight breast cancer by lowering the amount of estrogen the body makes. It is not yet known whether letrozole is more effective than a placebo in treating in women with breast cancer who have already received 5 years of aromatase inhibitor therapy.

PURPOSE: This randomized phase III trial is studying letrozole to see how well it works compared with a placebo in treating women with primary breast cancer who have received 5 years of aromatase inhibitor therapy.


Condition or disease Intervention/treatment Phase
Breast Cancer Drug: letrozole Other: placebo Phase 3

Detailed Description:

OBJECTIVES:

Primary

  • To compare the disease-free survival of women with primary breast cancer treated with letrozole vs placebo after completing approximately 5 years (i.e., 4½ - 6 years) of aromatase inhibitor therapy (e.g., letrozole, anastrozole, or exemestane).

Secondary

  • To compare the effect of these drugs on overall (all cause specific) mortality of these patients.
  • To compare the incidence of contralateral breast cancer in patients treated with these drugs.
  • To evaluate the long-term clinical and laboratory safety of aromatase inhibitor therapy, particularly cardiovascular morbidity and mortality (e.g., significant coronary artery disease, including myocardial infarction and angina requiring percutaneous transluminal coronary angioplasty or coronary artery bypass graft, fatal and nonfatal strokes, and all vascular deaths); incidence of all bone fractures (with particular emphasis on hip and wrist fractures as indicators of osteoporosis); changes in bone density; and common toxicities.
  • To compare overall quality of life (QOL) and menopausal-specific QOL of patients treated with these drugs.

OUTLINE: This is a multicenter study. Patients are stratified according to lymph node status at diagnosis (negative vs positive vs unknown), prior adjuvant chemotherapy (yes vs no), interval between last dose of aromatase inhibitor therapy and study randomization (< 6 months vs 6 months to 2 years), and duration of prior tamoxifen citrate use (0 vs < 2 years vs 2 - 4½ years vs > 4½ years). Patients are randomized to 1 of 2 treatment arms.

  • Arm I: Patients receive oral letrozole once daily for up to 5 years in the absence of unacceptable toxicity, disease recurrence, or development of a second malignancy.
  • Arm II: Patients receive oral placebo once daily for up to 5 years in the absence of unacceptable toxicity, disease recurrence, or development of a second malignancy.

Patients undergo bone mineral density measurement by DEXA scan at baseline (if not done within 12 months of study entry), at 24 and 48 months during study therapy, and at the completion of study therapy. Some patients also complete quality-of-life questionnaires at baseline and at 12, 24, 36, 48, and 60 months.

After completion of study therapy, patients are followed annually.


Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 1918 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Double Blind Randomization to Letrozole or Placebo for Women Previously Diagnosed With Primary Breast Cancer Completing Five Years of Adjuvant Aromatase Inhibitor Either as Initial Therapy or After Tamoxifen (Including Those in The MA.17 Study)
Actual Study Start Date : October 14, 2004
Actual Primary Completion Date : July 2015
Actual Study Completion Date : April 19, 2017

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Breast Cancer
Drug Information available for: Letrozole

Arm Intervention/treatment
Experimental: Letrozole
Patients receive oral letrozole once daily for up to 5 years in the absence of unacceptable toxicity, disease recurrence, or development of a second malignancy.
Drug: letrozole
Given orally
Other Name: femara

Placebo Comparator: Placebo
Patients receive oral placebo once daily for up to 5 years in the absence of unacceptable toxicity, disease recurrence, or development of a second malignancy.
Other: placebo
Given orally
Other Name: sugar pill




Primary Outcome Measures :
  1. Disease-free Survival (DFS) [ Time Frame: Unitil the end of study with a median follow up of 75 months ]
    It is defined as the months from the day of randomization to the earliest date when a recurrence of the primary disease (recurrence in the breast, chest wall and nodal sites or the development of metastatic disease) or a contralateral breast cancer was observed. Subjects who died without recurrence of the primary disease or the development of the contralateral breast cancer were censored at their death date. If a patient has not recurred, developed a contralateral breast cancer, or died, disease-free survival was censored on the date of the last day the patient was known to be alive. Probability of disease free survival at 5 years is estimated and reported.


Secondary Outcome Measures :
  1. Incidence of Contralateral Breast Cancer [ Time Frame: 10 years ]
    The annual incidence rate was estimated based on the time to the development of contralateral breast cancer, which was calculated in months from the day of randomization to the diagnosis date of contralateral breast cancer for subjects who had developed the contralateral breast cancer, to the time of death for the patient who died, or to the last day the patient was known alive for subjects without contralateral breast cancer

  2. Overall Survival (OS) [ Time Frame: Until the end of study with a median follow-up of 75 months ]
    For subjects who died, overall survival was calculated in months from the day of randomization to the date of death. Otherwise, survival was censored at the last day the patient was known to be alive. Probability of overall survival at 5 years is estimated and reported.

  3. Change From Baseline in Role Function- Physical Scale on SF(Short Form)-36 Health Survey [ Time Frame: 8 years ]
    Difference between post baseline scores and baseline score of role function-physical scale on SF-36 Health Survey (scale range between 0 and 100 with higher score indicating better quality of life).



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Ages Eligible for Study:   up to 120 Years   (Child, Adult, Older Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No
Criteria

DISEASE CHARACTERISTICS:

  • Previously diagnosed with primary breast cancer
  • Must have received 4½ - 6 years of aromatase inhibitor therapy (e.g., letrozole, anastrozole, or exemestane), either as initial therapy or after prior tamoxifen citrate, including treatment received as part of clinical trial CAN-NCIC-MA17

    • Completed aromatase inhibitor therapy ≤ 2 years ago
  • No metastatic or recurrent disease, contralateral breast cancer, or ductal carcinoma in situ in either breast, as determined by the following:

    • Clinical examination of the breast area, axillae, and neck within the past 60 days
    • Mammogram within the past 12 months*
    • Chest x-ray within the past 60 days
    • Bone scan, if alkaline phosphatase > 2 times normal and/or there are symptoms of metastatic disease AND confirmatory x-ray, if bone scan results are questionable, within the past 60 days
    • Abdominal ultrasound, liver scan, or CT scan of the abdomen within the past 60 days, if ALT, AST, or alkaline phosphatase > 2 times normal NOTE: *A baseline mammogram is not required for patients who have undergone bilateral complete mastectomy
  • Hormone-receptor status:

    • Estrogen receptor positive (ER+) and/or progesterone receptor positive (PR+) primary tumor at the time of diagnosis, defined as a tumor receptor content of > 10 fmol/mg protein or receptor positive by immunocytochemical assay (for patients not previously enrolled on clinical trial CAN-NCIC-MA17)
    • ER+ and/or PR+ primary tumor OR hormone receptor status of primary tumor unknown (for patients previously enrolled on clinical trial CAN-NCIC-MA17)

PATIENT CHARACTERISTICS:

  • Menopausal status not specified
  • ECOG performance status 0-2
  • Life expectancy ≥ 5 years
  • WBC > 3.0 x 10^9/L OR granulocyte count (polymorphs + bands) ≥ 1.5 times 10^9/L
  • Platelet count > 100 x 10^9/L
  • AST and/or ALT < 2 times upper limit of normal (ULN)*
  • Alkaline phosphatase < 2 times ULN*
  • Able (i.e. sufficiently fluent) and willing to complete quality-of-life questionnaires in either English or French (NCIC CTG participating centers)

    • Inability to complete questionnaires due to illiteracy in English or French, loss of sight, or other equivalent reason allowed
  • Accessible for treatment and follow-up
  • No other prior or concurrent malignancy except adequately treated, superficial squamous cell or basal cell skin cancer, carcinoma in situ of the cervix, or other cancer treated > 5 years ago that is presumed cured NOTE: *Elevated levels allowed provided imaging examinations have ruled out metastatic disease

PRIOR CONCURRENT THERAPY:

  • See Disease Characteristics
  • No concurrent selective estrogen receptor modulator (e.g., raloxifene, idoxifene)
  • No other concurrent anticancer therapy

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00754845


  Show 43 Study Locations
Sponsors and Collaborators
Canadian Cancer Trials Group
Eastern Cooperative Oncology Group
North Central Cancer Treatment Group
Southwest Oncology Group
Alliance for Clinical Trials in Oncology
Investigators
Study Chair: Paul E. Goss, MD, PhD Massachusetts General Hospital

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Canadian Cancer Trials Group
ClinicalTrials.gov Identifier: NCT00754845     History of Changes
Other Study ID Numbers: MA17R
CAN-NCIC-MA17R ( Registry Identifier: NCI US - Physician Data Query )
CDR0000614819 ( Other Identifier: PDQ )
First Posted: September 18, 2008    Key Record Dates
Results First Posted: November 19, 2018
Last Update Posted: November 19, 2018
Last Verified: November 2018

Keywords provided by Canadian Cancer Trials Group:
stage I breast cancer
stage II breast cancer
stage IIIA breast cancer
stage IIIB breast cancer
stage IIIC breast cancer

Additional relevant MeSH terms:
Breast Neoplasms
Neoplasms by Site
Neoplasms
Breast Diseases
Skin Diseases
Letrozole
Aromatase Inhibitors
Antineoplastic Agents
Steroid Synthesis Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Estrogen Antagonists
Hormone Antagonists
Hormones, Hormone Substitutes, and Hormone Antagonists
Physiological Effects of Drugs