Estradiol Suppression for the Treatment of Metastatic Breast Cancer in Premenopausal Women

Pre-menopausal women with estrogen and/or progesterone receptor positive, metastatic or
recurrent breast cancer were enrolled and treated with goserelin (Zoladex) monthly and began
anastrozole (Arimidex) daily for 21 days following the first injection of goserelin.
Participants continued on treatment until disease progression or unacceptable toxicity.

INCLUSION CRITERIA

- Histologically-confirmed, bi-dimensionally measurable, recurrent or metastatic
carcinoma of the breast that is progressive

- Premenopausal, defined as any of:

1. Last menstrual period within 3 months, or

2. Post-hysterectomy without bilateral oophorectomy and with follicle-stimulating
hormone (FSH) in the premenopausal range, or,

3. If tamoxifen administered within the past 3 months, plasma estradiol must be in
the premenopausal range

- Either positive estrogen and/or progesterone receptor determination by
Immunohistochemistry (IHC) or competitive binding assay on metastatic disease, or if
not performed on their metastatic disease a positive result on their primary breast
cancer specimen.

- Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1, or 2

- Granulocytes > 1500/mm^3

- Platelets > 100,000/mm^3

- Serum glutamic oxaloacetic transaminase (SGOT) < 2.5 x upper limit of normal

- Total bilirubin < 1.5 mg/dL

- May have received irradiation to bony sites of disease for pain control or for
prevention of fracture. The irradiated site(s) will NOT be evaluable for disease
response.

- Must be using effective contraception or not be of childbearing potential

- Signed written informed consent

INCLUSION CRITERIA

- Active, unresolved infection

- Active malignancy other than breast cancer, in situ carcinoma of the cervix, or
non-melanomatous skin cancers in the past 5 years

- Prior treatment with an aromatase inhibitor or inactivator

- Prior treatment with an luteinizing hormone-releasing hormone (LH/RH)
agonist/antagonist

- Adjuvant chemotherapy within 6 months of study entry.

- Received chemotherapy or hormonal therapy in the 3 weeks prior to enrollment

- Central nervous system metastasis

- Lymphangitic pulmonary metastasis

- Pregnant or lactating