Cancer • Historically agents given systemically – Agents that kill rapidly dividing cells • Find therapeutic dose Kills tumor cells w/o killing patient – Lots of side effects • Localized/targeted delivery is the holy grail – Nanomedicine!! – Also protection from degradation and increased solubility
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Cancer Historically agents given systemically – Agents that kill rapidly dividing cells Find therapeutic dose Kills tumor cells w/o killing patient –
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Cancer
• Historically agents given systemically– Agents that kill rapidly dividing cells
• Find therapeutic dose Kills tumor cells w/o killing patient– Lots of side effects
• Localized/targeted delivery is the holy grail– Nanomedicine!!– Also protection from degradation and increased
solubility
• Nanoparticles – drug throughout
• Nanocapsules – drug w/in coating
• PEGylation – makes stealthy
• Ligand – binds to cell receptor for targeting
Tumor Vasculature• Irregularly shaped, big, and leaky• Lack of lymph drainage• High vessel density
Passive Targeting EPR• Small drugs enter tumor and leave• Particles enter and stay– Long circulation time key
Active Targeting• EPR + something that binds tumor cells
specifically
Targeting
Interfere with signaling when bind (targeting ligand and drug)
Ab tethered to drug
Ligand + drug
depends upon over-expression of surface molecules by tumor cells