Volume 10 Number 2 2026
Engineering Blood-Brain Barrier Penetrant Delivery Systems for Glioblastoma Mechanistic Barriers, Platform Innovation, and the Long Road to the Clinic
Long Chiau Ming 1*, Ong Khang Wei 2, Nurul Dayana Binti Mahizir 2
Integrative Biomedical Research 10 (2) 1-8 https://doi.org/10.25163/biomedical.10210937
Submitted: 27 July 2026 Revised: 14 September 2026 Accepted: 23 September 2026 Published: 25 September 2026
Glioblastoma (GBM) remains, despite three decades of trial-and-error refinement of the Stupp protocol, a disease that most patients do not survive beyond fifteen months. This review asks a fairly narrow but stubborn question: why do so many pharmacologically promising agents, effective in a dish, fail once they must cross the blood–brain barrier (BBB) and reach the infiltrative rim of a real tumor? We synthesize evidence across four interlocking domains. First, we examine the physiological and biophysical barriers, from tight-junction–sealed endothelium to the elevated interstitial fluid pressure that opposes convective drug movement Second, we catalogue the nanomedicine platforms, lipid, polymeric, albumin-based, inorganic, and biomimetic, that have been engineered to outmaneuver these obstacles. Third, we consider receptor-mediated transcytosis and a case study, the Dendrobium-derived bibenzyl TDB, which appears to suppress dual mTORC1/mTORC2 signaling, trigger apoptosis, and resensitize glioma cells to temozolomide. Fourth, we turn to physical and locoregional strategies, focused ultrasound, convection-enhanced delivery, intra-arterial infusion, and intranasal transport, several of which have now produced encouraging early-phase clinical signals. Rather than presenting these as separate success stories, we argue, perhaps more cautiously than earlier reviews, that their common failure mode is the same: drug reaches the enhancing core but not the non-enhancing margin where recurrence begins. We close by outlining what a more reproducible translational pipeline, biomarker-guided, spatially validated, might look like going forward.
Keywords: glioblastoma; blood-brain barrier; blood-tumor barrier; nanomedicine; receptor-mediated transcytosis; focused ultrasound; TDB; translational bottlenecks
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