Triple-negative breast cancer brain metastasis: An update on druggable targets, current clinical trials, and future treatment options

The key challenges with the treatment of triple-negative breast cancer brain metastasis (TNBC-BM) are the lack of any targeted therapy and difficulties associated with drug delivery to the brain. These add to the high toxicity profile of existing treatments and the poor outcomes for patient. In this review, we introduce current drugs based on their molecular targets and look to improve brain drug delivery using more efficient and promising drug delivery systems. We describe ongoing clinical trials on druggable targets in TNBC-BM for a more targeted treatment and introduce the obstacles hindering drug delivery to the brain, bringing strategies and advancing knowledge for future steps in the treatment of patients with TNBC-BM.