Liposome-Encapsulated Anticancer Drugs: Still Waiting for the Magic Bullet?

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Abstract:

Anticancer drugs are essential agents in the global strategy developed to fight cancer. Still, narrow therapeutic indices, erratic pharmacokinetics profiles and lack of selectivity towards malignant tissues often hamper their efficacy at the bedside, when they not cause severe toxicities. In this respect, developing innovative drug delivery strategies that would selectively target malignant tissues is still an ongoing story, both in experimental and in clinical oncology. Delivery systems such as liposomes are usually required when an existing formulation is not satisfactory, because encapsulation is expected to provide higher therapeutic efficacy and safety. Such significant improvement in therapeutic efficacy and/or therapeutic indices has already been achieved in patients with some liposome-encapsulated drugs such as anthracyclines. It is now possible to develop a wide range of vectors varying in size, composition, and surface morphology suitable for a variety of therapeutic applications, including for targeting tumor tissues. Reformulation of anticancer drugs in liposomes remains a challenging opportunity to stretch the therapeutic indices of many cytotoxic drugs, through the optimization of their distribution in the body. Despite these promising and exciting perspectives in oncology, to date only few drugs (e.g., anthracyclines) have actually made their way as liposomes from the bench to the bedside. However, as target therapies have brought a new hope in the cancer war in the 2000's, developing now targeted delivery systems is more and more seen as the next step to further improve clinical outcome in cancer patients. This review covers the achievements, limits, and new expectancies of anticancer drugs as candidates for liposomal encapsulation.

Keywords: Liposomes; anticancer drugs; drug delivery; nanotechnology; passive targeting

Document Type: Research Article

DOI: http://dx.doi.org/10.2174/092986709789712916

Affiliations: UFR Pharmacie, 27 Bd Jean Moulin, 13385 Marseille Cedex 05 France.

Publication date: November 1, 2009

More about this publication?
  • Current Medicinal Chemistry covers all the latest and outstanding developments in medicinal chemistry and rational drug design. Each issue contains a series of timely in-depth reviews written by leaders in the field covering a range of the current topics in medicinal chemistry. Current Medicinal Chemistry is an essential journal for every medicinal chemist who wishes to be kept informed and up-to-date with the latest and most important developments.
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