Trial of Exemestane +/- MM-121 in Postmenopausal Women With Locally Advanced or Metastatic Estrogen Receptor Positive and/or Progesterone Receptor Positive Her2 Negative Breast Cancer

A Randomized Double-Blind Phase 2 Trial of Exemestane +/- MM-121 in Postmenopausal Women With Locally Advanced or Metastatic Estrogen Receptor Positive (ER+) and/or Progesterone Receptor Positive (PR+) Her2 Negative Breast Cancer

To determine whether the combination MM-121 + Exemestane in ER+ and/or PR+ breast cancer patients is more effective than Exemestane alone

The study is a double-blind, randomized Phase 2 trial of Exemestane +/- MM-121. The trial is designed to demonstrate whether MM-121 + Exemestane is more effective than Exemestane alone in ER+ and/or PR+ and Her2 negative breast cancer patients that have failed first-line anti-estrogen therapy in the locally advanced or metastatic setting and patients that have progressed during (or within 6 months of completing) adjuvant treatment with a non-steroidal aromatase inhibitor (AI)and/or tamoxifen. Patients will be treated until radiologic or clinical progression of their disease is documented. Local radiologist and/or PI assessment is accepted.

Inclusion Criteria:

• Locally advanced or metastatic breast cancer
• Histologically or cytologically confirmed ER+ and/or PgR+ and Her2 negative breast cancer
• ≥ 18 years of age

Exclusion Criteria:

• Received prior treatment with exemestane
• Extensive visceral disease (rapidly progressive, life-threatening metastases, including symptomatic lymphangitic metastases)
• Symptomatic CNS disease