Exemestane in Preventing Cancer in Postmenopausal Women at Increased Risk of Developing Breast Cancer

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Basic Trial Information

PhaseTypeStatusAgeSponsorProtocol IDs
Phase IIIBiomarker/Laboratory analysis, PreventionClosed35 and overOtherMAP3
CAN-NCIC-MAP3, PFIZER-EXEAPO-0028-150, ExCel, CDR0000363802, NCT00083174

Trial Description


RATIONALE: The MAP.3 study was designed to test whether hormone therapy using exemestane may prevent breast cancer by blocking the production of estrogen. This study was analyzed in April 2011 and showed a 65% reduction in the incidence of invasive breast cancer in women receiving exemestane compared to women on placebo.

PURPOSE: The study protocol was amended in May 2011 and the current purpose of the study is to allow all study participants the opportunity to complete 5 years of exemestane.

Further Study Information



Previously: To determine if exemestane reduces the incidence of invasive breast cancer compared with placebo.

Currently: To determine the frequency of serious adverse events for post-menopausal women at high-risk of developing breast cancer who choose to receive 5 years of exemestane as preventative therapy.


Previously: (same as is currently listed in PDQ) Currently: To address the Trial Committee and Sponsor's commitment to allow women who are randomized to the MAP.3 trial to receive 5 years of exemestane therapy.

OUTLINE: This study was a randomized, double-blind, placebo-controlled, multicentre study. Protocol-specified analyses were performed in April 2011. The results of these analyses are posted in the Results section. Following the amendment of May 2011, the study is now open-label and all eligible patients are receiving exemestane from participating sites for a total of 5 years. After exemestane is stopped, there is no further follow-up.

PROJECTED ACCRUAL:There were 4560 women from the United States, Canada, Spain and France who took part in this study.

Eligibility Criteria

  • At increased risk of developing breast cancer, due to at least one of the following risk factors:
  • Gail score ≥ 1.66
  • Age ≥ 60 years
  • Prior atypical ductal hyperplasia, lobular hyperplasia, or lobular carcinoma in situ on breast biopsy
  • Prior ductal carcinoma in situ (DCIS) treated with total mastectomy with or without tamoxifen (tamoxifen must have been completed ≥ 3 months prior to randomization)
  • No prior DCIS treated with lumpectomy with or without radiation
  • No prior invasive breast cancer
  • Not BRCA1 or BRCA2 carriers



  • 35 and over
  • Female
  • Postmenopausal, defined as one of the following:
  • over 50 years of age with no spontaneous menses for at least 12 months before study entry
  • 50 years of age or under with no menses (spontaneous or secondary to hysterectomy) for at least 12 months before study entry AND with follicle-stimulating hormone level within postmenopausal range
  • Underwent prior bilateral oophorectomy
  • No other malignancies within the past 5 years except adequately treated nonmelanoma skin cancer, curatively treated carcinoma in situ of the cervix, or other curatively treated solid tumors with no evidence of disease for ≥ 5 years
  • No uncontrolled hypothyroidism or hyperthyroidism
  • No major medical or psychiatric illness (including substance and alcohol abuse within the past 2 years) that would preclude study participation or compliance
  • Must be accessible for treatment and follow-up
  • Willing to complete quality of life questionnaires in either English or French

Current: MAP.3 participants who were randomized to the exemestane arm, are currently receiving exemestane as part of the MAP.3 study and who have not completed 5 years of exemestane.

OR MAP.3 study participants who were randomized to the placebo arm and who have either completed 5 years of study drug or who are still receiving placebo. Note: this applies only to centres that choose to allow placebo "cross-over".



  • More than 3 months since prior and no concurrent hormone replacement therapies
  • More than 3 months since systemic estrogenic, androgenic, or progestational agents
  • More than 3 months since prior and no concurrent hormonal therapies, including, but not limited to the following:
  • Luteinizing-hormone releasing-hormone analogs (e.g., goserelin or leuprolide)
  • Progestogens (e.g., megestrol)
  • Prolactin inhibitors (e.g., bromocriptine)
  • Antiandrogens (e.g., cyproterone acetate)
  • Selective estrogen-receptor modulators (e.g., tamoxifen, toremifene, or raloxifene)
  • No investigational drug within 30 days or 5 half lives prior to randomization
  • No concurrent endocrine therapy
  • No concurrent estrogens, androgens, or progesterones
  • Concurrent low dose (≤ 100 mg/day) prophylactic aspirin allowed
  • Concurrent bisphosphonates for prevention or treatment of osteoporosis allowed
  • No other concurrent medications that may have an effect on study endpoints

Current: There are no prior concurrent therapy restrictions for the amended MAP.3 study.

Trial Contact Information

Trial Lead Organizations/Sponsors

NCIC-Clinical Trials Group

  • Grupo Espanol de Investigacion del Cancer de Mama
  • Federation Nationale des Centres de Lutte Contre le Cancer
Paul Edward Goss, Study Chair

Link to the current ClinicalTrials.gov record.
NLM Identifier NCT00083174
ClinicalTrials.gov processed this data on May 11, 2015

Note: Information about this trial is from the ClinicalTrials.gov database. The versions designated for health professionals and patients contain the same text. Minor changes may be made to the ClinicalTrials.gov record to standardize the names of study sponsors, sites, and contacts. Cancer.gov only lists sites that are recruiting patients for active trials, whereas ClinicalTrials.gov lists all sites for all trials. Questions and comments regarding the presented information should be directed to ClinicalTrials.gov.