This study will look at different dose levels and regimens of everolimus combined with weekly trastuzumab and vinorelbine therapy in patients with HER-2 overexpressing metastatic breast cancer.

Inclusion criteria:

• Female or male patients ≥18 years with WHO performance status ≤ 1
• HER-2 overexpressing metastatic breast cancer cells confirmed by histology
• Progressive disease on prior trastuzumab alone/or in combination with other anticancer agents, or relapsed any time after completion of this therapy
• Patients neurologically stable with adequate bone marrow, liver and renal function

Exclusion criteria:

• Patients receiving endocrine therapy for breast cancer ≤ 2 weeks prior to study treatment start
• Patients currently receiving chemotherapy, immunotherapy or radiotherapy or who have received these ≤ 4 weeks prior to study treatment start or patients who have received lapatinib ≤ 2 weeks prior to study treatment start
• Patients who have previously received vinorelbine or mTOR inhibitors

Other protocol-defined inclusion/exclusion criteria may apply