Glioblastomas (GB) are grade 4 brain tumors, one of the most aggressive forms of brain cancer found in humans. Although current treatments for GB are largely ineffective, new alternate approaches, beyond standard chemo- or radiation therapies have shown promising results in both pre-clinical and clinical settings. Some of these approaches include stem cell therapy, new pharmaceuticals and nutraceuticals, and the use of tumor specific peptides or GB-targeted antibodies and immune-based therapies. A common limitation in the efficacy of these treatments is the inability of these therapeutic agents to readily cross the blood–brain barrier (BBB) to reach the tumor site. Therefore, many strategies are being developed to achieve targeted delivery of drugs across the BBB so that they can kill the cancer cells, while sparing healthy tissue. One of the most promising new approaches involves the use of nanoparticles that can carry therapeutic drugs and genes across the BBB and home in on the GB tumor site.
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