The Enhanced Permability and Retention (EPR) effect is the property by which certain sizes of drug delivery carriers, typically liposomes, are able to penetrate deep into the leaky vasculature surrounding solid tumor cells. A liposome is a spherical vesicle with a membrane composed of a phospholipid bilayer used to deliver drugs or genetic material into a cell. ... Human circulatory system. ... Tumor (American English) or tumour (British English) originally means swelling, and is sometimes still used with that meaning. ...

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