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. Author manuscript; available in PMC: 2022 Jan 13.
Published in final edited form as: J Control Release. 2017 Sep 14;267:15–30. doi: 10.1016/j.jconrel.2017.09.016

Fig. 2.

Fig. 2.

Major mechanisms of drug delivery across the endothelial cell barrier into tumors.

Schematic representations of passive paracellular drug transport via interendothelial junctions, passive transcellular drug transport via vesiculo-vacuolar organelles (VVOs), and active drug transport via caveolar transcytosis. Note these schematic diagrams depict tumor continuous endothelial cells lacking fenestrations.