4EVER - Efficacy, Safety, Health Economics, Translational Research of Postmenopausal Women With Estrogen Receptor Positive Locally Advanced or Metastatic Breast Cancer

Main Inclusion criteria:

Metastatic or locally advanced breast cancer not amenable to curative treatment by surgery or radiotherapy or any other non-systemic treatment.

Histological or cytological confirmation of estrogen receptor positive (ER+) and/or progesterone receptor positive (PgR+), human epidermal growth factor receptor 2 (HER2) negative breast cancer Postmenopausal women. Disease progression following prior therapy with non steroidal aromatase inhibitors (NSAI), defined as: Recurrence while on, or following completion of an adjuvant treatment with Letrozole or Anastrozole, or Progression while on or following completion of Letrozole or Anastrozole treatment for ABC/MBC.

Radiological evidence of recurrence or progression on last systemic therapy prior to enrollment.

Patients must have at least one lesion that can be accurately measured or bone lesions: lytic or mixed (lytic + sclerotic) in the absence of measurable disease.

Written informed consent obtained before any screening procedure and according to local guidelines.

Other protocol defined inclusion criteria apply.

Main Exclusion criteria:

HER2-overexpressing patients by local laboratory testing (IHC 3+ staining or in situ hybridization positive).

Patients with only non-measurable lesions other than bone metastasis (e.g. pleural effusion, ascites etc.).

Previous treatment with mTOR inhibitors or known hypersensitivity to mTOR inhibitors.

Symptomatic brain or other CNS metastases. Previously treated brain metastases are allowed provided the patient is free of symptoms, prior radiotherapy for brain metastasis was more than four weeks before enrollment and the dose of corticosteroids is low (i.e. ≤ 10 mg/d Prednisolone equivalent) and stable for at least two weeks prior to enrollment.

Patients with Hepatitis B or C or with a history of Hepatitis B or C. Patients unwilling to or unable to comply with the protocol. Other protocol defined exclusion criteria apply.