- Concurrent Therapy: patients may not receive concurrent hormonal therapy, chemotherapy, or radiation treatments while on study; patients requiring radiation therapy during protocol-based treatment will be taken off study; if patients develop intraparenchymal brain metastases while on treatment, but do not have evidence of other systemic progression, they will be allowed to resume treatment with the combination once their radiation has been completed; they will be allowed to continue trastuzumab therapy during radiation, at the treating physician's discretion; nevertheless, the date of discovery of the CNS disease will still be considered the date of disease progression; patients may receive concurrent bisphosphonate therapy (e.g. pamidronate) while on study; patients may not receive other experimental treatments while on study