The results obtained in this study esablis that liposome formulations incorporating a synthetic polyethylene glycol-derivatied phospholipid have a pronounced effect on liposome tissue dt n and can produce a large increase in the pharmaologial eflkacy of encapsulated antitumor drugs. This effect is i ly greater than that observed previously with conventionl lposomes and is ith a more than 5-fold

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A formulation of sterically stabilized liposomes with the proper thermal sensitivity in human plasma has been obtained. In addition, the results suggest that complement may play an important role in the interaction of rigid but not fluid liposomes with bovine serum. Human plasma did not show this effect.