LCCC1214 is a randomized, multiarm, multicenter, open-label window trial designed to explore the kinome response in Stage I-IV HER2 positive (HER2+) breast cancer patients scheduled to undergo definitive surgery (either lumpectomy, mastectomy or surgical resection of oligometastatic disease). Patients will initiate dosing with either a single HER2-directed agent or a combination of two HER2-directed agents, one week prior to surgery. Forty patients will be randomized to one of four study groups: