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Major advances in molecular biology, cellular biology and genomics have substantially improved our understanding of cancer. Now, these advances are being translated into therapy. Targeted therapy directed at specific molecular alterations is already creating a shift in the treatment of cancer patients. Glioblastoma (GBM), the most common brain cancer of adults, is highly suited for this new approach. GBMs commonly overexpress the oncogenes EGFR and PDGFR, and contain mutations and deletions of tumor suppressor genes PTEN and TP53. Some of these alterations lead to activation of the PI3K/Akt and Ras/MAPK pathways, which provide targets for ther-apy. In this paper, we review the ways in which molecular therapies are being applied to GBM patients, and describe the tools of these approach-es: pathway inhibitors, monoclonal antibodies and oncolytic viruses. We describe strategies to: i) target EGFR, its ligand-independent variant EGFRvIII, and PDGFR on the cell surface, ii) inhibit constitutively activate RAS/MAPK and PI3K/Akt signaling path-ways, iii) target TP53 mutant tumors, and iv) block GBM angiogenesis and invasion. These new approaches are likely to revolutionize the treatment of GBM patients. They will also present new chal-lenges and opportunities for neuropathology. Brain Pathol 2003;13:52-61