Abstract
Despite advances in anticancer drug discovery and development, there has been little improvement in the prognosis and outcome of malignant brain tumors. Often and repeatedly it has been found that promising experimental agents for brain tumors have had little impact on the disease in clinical trials. These disappointing results can be partially explained by the inability to deliver therapeutic agents to the CNS across the physiological barriers (the blood–brain, blood–tumor, and blood–CSF barriers). The impediment posed by these barriers leads to failure of the delivered drug to reach the desired target in adequate concentrations. This chapter shortly reviews the leading strategies that try to improve drug delivery to brain tumors in view of their likelihood to change clinical practice. Strategies that use systemic delivery and those that utilize local delivery are critically reviewed. In addition challenges posed for drug delivery by the combined treatment with anti-angiogenic therapy are outlined. For future development all new drugs or delivery systems must adhere to basic clinical expectations. These include besides an anti-tumor effect, a verified favorable toxicity profile, an easy introduction into clinical practice, feasibility of repeated or continuous administration and compatibility of the drug or strategy for any tumor size and brain location. Adherence to these essentials will enable a change in clinical practice
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Abbreviations
- Abbreviation AUC:
-
Area under the curve
- BBB:
-
Blood–brain barrier
- CED:
-
Convection-enhanced delivery
- CNS:
-
Central nervous system
- CSF:
-
Cerebrospinal fluid
- ECF:
-
Extracellular fluid
- EGF:
-
Epidermal growth factor
- HD-CTx:
-
High-dose chemotherapy
- MTX:
-
Methotrexate
- P-gp:
-
P-glycoprotein
- PEG:
-
Polyethylene glycol
- RES:
-
Reticuloendothelial system
- SAE:
-
Severe adverse effects
- VEGF:
-
Vascular endothelial growth factor
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Siegal, T. (2014). Which Drug or Drug Delivery Method Can Change Clinical Practice for Brain Tumor Therapy?. In: Hammarlund-Udenaes, M., de Lange, E., Thorne, R. (eds) Drug Delivery to the Brain. AAPS Advances in the Pharmaceutical Sciences Series, vol 10. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9105-7_24
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