Patients must have histologically confirmed invasive breast cancer with stage IV disease, either biopsy proven or with unequivocal evidence of metastatic disease by physical examination or radiological study Patients must have histologically or cytologically confirmed invasive breast cancer, with stage IV disease; patients without pathologic or cytologic confirmation of metastatic disease should have unequivocal evidence of metastasis from physical examination or radiologic evaluation Participants must have histologically confirmed invasive breast cancer, with locally advanced or metastatic disease; patients without pathologic confirmation of metastatic disease should have unequivocal evidence of metastasis from physical examination or radiologic evaluation; for subjects in Cohort C, the tumor must also be hormone receptor positive, defined as demonstrating at least 1% tumor cell nuclei staining positive for either ER or progesterone receptor (PR) Patients must have histologically or cytologically confirmed invasive breast cancer, with stage IV disease; patients without pathologic or cytologic confirmation of metastatic disease should have unequivocal evidence of metastasis from physical examination or radiologic evaluation\r\n* Measurable disease: patients must have measurable CNS disease, defined as at least one parenchymal brain lesion that can be accurately measured in at least one dimension with the longest diameter >= 10 mm by local radiology review (measurable non-CNS disease is not required for study participation)\r\n* Patients will be defined as HER2 positive (+) if either the primary tumor and/or the metastasis are HER2-positive, defined as 3+ by immunohistochemistry (IHC) or fluorescence in situ hybridization (FISH) >= 2.0 Participants must have histologically or cytologically confirmed stage IV invasive breast cancer. Participants without pathologic or cytologic confirmation of metastatic disease should have unequivocal evidence of metastasis from physical examination or radiologic evaluation Pathologically confirmed squamous cell carcinoma of the head and neck with evidence of metastatic disease or locally recurrent disease considered incurable by local therapies; patients without pathologic or cytologic evidence of metastatic disease should have unequivocal evidence of metastasis from physical examination or radiologic evaluation Participants must have histologically or cytologically confirmed invasive breast cancer, with metastatic disease; participants without pathologic or cytologic confirmation of metastatic disease should have unequivocal evidence of metastasis from physical examination or radiologic evaluation Participants must have histologically or cytologically confirmed invasive breast cancer, with either locally advanced or metastatic disease; patients without pathologic or cytologic confirmation of metastatic disease should have unequivocal evidence of metastasis from physical examination or radiologic evaluation Participants must have histologically or cytologically confirmed invasive breast cancer, with metastatic disease; participants without pathologic or cytologic confirmation of metastatic disease should have unequivocal evidence of metastasis from physical examination or radiologic evaluation Participants must have histologically or cytologically confirmed invasive breast cancer, with unresectable locally advanced or metastatic disease; participants without pathologic or cytologic confirmation of metastatic disease should have unequivocal evidence of metastasis from physical examination or radiologic evaluation Patients must have histologically or cytologically confirmed invasive breast cancer, with metastatic disease; patients without pathologic or cytologic confirmation of metastatic disease should have unequivocal evidence of metastasis by physical exam or radiologic study Patients must have histologically or cytologically confirmed stage IV invasive breast cancer; patients without pathologic or cytologic confirmation of metastatic disease should have unequivocal evidence of metastasis from physical examination or radiologic evaluation