Combined Estrogen Blockade of the Breast With Exemestane and Raloxifene in Postmenopausal Women With a History of Breast Cancer Who Have No Clinical Evidence of Disease

Combined Estrogen Blockade of the Breast With Exemestane and Raloxifene in Postmenopausal Women With a History of Breast Cancer Who Have No Clinical Evidence of Disease: A Pilot Chemoprevention Trial

The purpose of this research study is to learn about the effects of two drugs when they are given together. The names of the drugs are raloxifene and exemestane.

Raloxifene is a drug that is related to estrogen. In the liver and bone, it acts like estrogen. In the breast and uterus it acts like an anti-estrogen. It has been used in postmenopausal women to prevent a disease called osteoporosis. This is a disease that decreases bone strength over many years and may finally lead to bone fractures. In a group of women who were taking the drug, it also seemed to decrease the chances of breast cancer and possibly endometrial cancer (cancer of the uterus). Therefore, we want to study it further to see if it prevents breast cancer. We also want to find out if it may be even better in preventing breast cancer if it is given with another drug.

The other drug in this trial is exemestane. Exemestane is a type of drug that works to decrease estrogen levels in postmenopausal women. This type of drug is used in women for the treatment of breast cancer. Before we can decide if the two drugs combined are better for preventing breast cancer, we must first test these drugs together to make sure that they are safe. This safety testing is the purpose of this trial.

Study Overview

• Status: Completed
• Conditions: Breast Cancer
• Intervention / Treatment: Drug: Raloxifene followed by combination therapy; Drug: Exemestane followed by combination therapy

Detailed Description

The objectives of this project are to investigate the safety and toxicity of the combination of raloxifene, a selective estrogen receptor modulator (SERM), with exemestane, a new steroidal aromatase inhibitor, in postmenopausal women with a history of breast cancer who have no clinical evidence of disease. The study cohort will consist of postmenopausal women with a history of AJCC Stage 0, I, II, or III breast cancer after completion of all planned adjuvant therapy. The study cohort is limited to patients who have not already received anti-estrogen therapy as part of post-operative adjuvant treatment. Patients with a history of invasive ER- and/or PR-positive breast cancer are eligible only if they have not received an anti-estrogen as part of adjuvant therapy, and they are at least 2 years from the time of their primary surgery.

Tamoxifen has been shown to reduce the incidence of contralateral breast cancer regardless of the estrogen expression of the primary tumor and may therefore be offered as a chemopreventive agent to patients who have not received an anti-estrogen in the adjuvant setting. This population of patients is also a reasonable cohort in which to test other chemoprevention regimens. Our hypothesis is that the combination of raloxifene and exemestane may offer an alternative treatment for chemoprevention that may prove to be more effective than an anti-estrogen alone.

Endpoints of the study are to determine whether the combination of raloxifene and exemestane is safe and tolerable with respect to:

1. markers of bone turnover and bone mineral density
2. the serum lipoprotein profile
3. quality of life (in particular, symptoms of estrogen deficiency)
4. pharmacokinetics and pharmacodynamics of both drugs.

We will also determine the feasibility of using mammography and breast MRI imaging to assess the effects of the combination on radiographic breast density.

As part of a correlative laboratory study of breast biopsy material, women may undergo an optional biopsy of their unaffected breast. Breast biopsy material will be evaluated both pre- and 3 months post-treatment to determine whether the combination will have an impact on breast tissue aromatase activity and breast tissue estrogen levels, and potential surrogate endpoint biological markers.

• Study Type: Interventional
• Enrollment (Actual): 11
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • New York
    • New York, New York, United States, 10021
      • Memorial Sloan-Kettering Cancer Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 16 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Postmenopausal women with a history of AJCC Stage 0, I, II or III breast cancer, with no clinical evidence of disease, after completion of all planned adjuvant therapy. Patients must not have received anti-estrogen therapy as part of their adjuvant treatment. Patients with a history of invasive ER- and/or PR-positive breast cancer are eligible only if they have not received an anti-estrogen as part of adjuvant therapy, and they are at least 2 years from the time of their primary surgery.
• Patients must have completed all planned adjuvant therapy, including surgery, chemotherapy, and radiation therapy, at least 4 weeks prior to treatment. There is no limit as to the amount of time that may have passed since completion of adjuvant therapy and initiation of treatment.

• Patients must be postmenopausal, as defined by either:

  1. No spontaneous menses for at least 5 years; women who have had a hysterectomy in this group, but have intact ovaries must have luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels within the postmenopausal range
  2. Spontaneous menses within the past 5 years, but amenorrheic (e.g. spontaneous or secondary to chemotherapy, radiation therapy or hysterectomy) for at least 12 months, and luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels within the postmenopausal range
  3. Bilateral oophorectomy
• Patients must have a history of breast cancer confirmed by the Department of Pathology at Memorial Sloan-Kettering Cancer Center.
• Patients must be at least 18 years old, and must be able to give written informed consent.
• Karnofsky performance status > 80%.
• Laboratory parameters:

WBC =>3.0 x 106 cells/ml serum bilirubin <= 1.5 mg/dl serum creatinine <= 1.5 mg/dl serum AST (SGOT) <= 2x upper institutional normal CEA and CA15-3 within institutional normal limits

Exclusion Criteria:

• Prior history of bilateral mastectomy.
• Prior history of ovarian or endometrial cancer.
• Prior or current history of osteoporosis, as defined by a lumbar-spine bone mineral density < 2.5 SD below the mean value for normal premenopausal women.
• Use of bisphosphonates or calcitonin within the past 3 months.
• Prior history of venous thrombosis or pulmonary embolism.
• Patients with unstable angina or New York Heart Association Class III or IV heart disease.
• Prior hormonal therapy within the past 3 months.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: A; Raloxifene followed by combination therapy	Drug: Raloxifene followed by combination therapy; Patients will be randomized to either Raloxifene at 60mg P.O. (each day) for 2 weeks (time designated: week- 2) After two weeks of single agent therapy, patients will be started on combination therapy with oral raloxifene (60mg/day) and oral exemestane (25mg/day) (time designated week 0), and continued on both drugs for one year (month 12). Patients will be required to start supplemental calcium (900-1500 mg/day) plus vitamin D (400-600 units/day) P.O. each day during week 0.
Active Comparator: B; Exemestane followed by combination therapy	Drug: Exemestane followed by combination therapy; Patients will be randomized to Exemestane at 25mg P.O. for 2 weeks (time designated: week- 2) After two weeks of single agent therapy, patients will be started on combination therapy with oral raloxifene (60mg/day) and oral exemestane (25mg/day) (time designated week 0), and continued on both drugs for one year (month 12). Patients will be required to start supplemental calcium (900-1500 mg/day) plus vitamin D (400-600 units/day) P.O. each day during week 0.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
To evaluate the clinical safety and toxicity of raloxifene in combination with exemestane in postmenopausal women with a hx of AJCC Stage 0, I, II, or III breast cancer, who have no clinical evidence of disease, after completion of all planned adjuvant	1 year

Secondary Outcome Measures

Outcome Measure	Time Frame
To determine the feasibility of using mammography and breast MRI imaging to assess the effects of raloxifene plus exemestane on radiographic breast density.	baseline and 12 months

Collaborators and Investigators

• Sponsor: Memorial Sloan Kettering Cancer Center
• Collaborators: Pharmacia
• Investigators: Principal Investigator: Maura Dickler, MD, Memorial Sloan Kettering Cancer Center

Publications and helpful links

Helpful Links

• Memorial Sloan-Kettering Cancer Center

Study record dates

Study Major Dates

• Study Start: July 1, 1999
• Primary Completion (Actual): July 1, 2003
• Study Completion (Actual): August 1, 2008

Study Registration Dates

• First Submitted: September 9, 2005
• First Submitted That Met QC Criteria: September 12, 2005
• First Posted (Estimated): September 20, 2005

Study Record Updates

• Last Update Posted (Actual): July 5, 2023
• Last Update Submitted That Met QC Criteria: July 3, 2023
• Last Verified: July 1, 2023

More Information

Terms related to this study

• Keywords: estrogen; Breast cancer; postmenopausal
• Additional Relevant MeSH Terms: Skin Diseases; Neoplasms; Neoplasms by Site; Breast Diseases; Breast Neoplasms; Physiological Effects of Drugs; Molecular Mechanisms of Pharmacological Action; Enzyme Inhibitors; Antineoplastic Agents; Hormones, Hormone Substitutes, and Hormone Antagonists; Hormone Antagonists; Bone Density Conservation Agents; Aromatase Inhibitors; Steroid Synthesis Inhibitors; Estrogen Antagonists; Selective Estrogen Receptor Modulators; Estrogen Receptor Modulators; Raloxifene Hydrochloride; Exemestane
• Other Study ID Numbers: 99-017