HELENA Study: An Observational Study of Perjeta (Pertuzumab) in First-Line Treatment in Patients With Her2-Positive Advanced Breast Cancer After Adjuvant Herceptin Therapy

This observational study will evaluate the efficacy, safety and patient reported quality of life of palliative first-line Perjeta (pertuzumab) in combination with Herceptin (trastuzumab) in patients with HER2-positive advanced breast cancer (metastatic or locally recurrent, inoperable) who relapsed after completed adjuvant Herceptin therapy. Additionally, information on selection criteria of breast cancer patients treated first-line with Perjeta, Herceptin and chemotherapy and their treatment duration will be collected and analyzed. Data will be collected from eligible patients for up to 20 months of treatment and 24 months of follow-up.