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Controlled Release Of Antiproliferative Drugs From Polymeric Systems For Stent Applications And Local Cancer Treatment
Amir Kraitzer, M. Zilberman
Published 2012 · Materials Science
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Restenosis (re-narrowing of the blood vessel wall) and cancer are two different pathologies that have drawn extensive research attention over the years. Antiproliferative drugs such as paclitaxel inhibit cell proliferation and are therefore effective in the treatment of cancer as well as neointimal hyperplasia, which is known to be the main cause of restenosis. Drug-eluting stents (DES) significantly reduce the incidence of in-stent restenosis (ISR), which was once considered a major adverse outcome of percutaneous coronary stent implantations. Localized release of antiproliferative drugs interferes with the pathological proliferation of vascular smooth muscle cells (VSMC), which is the main cause of ISR. Conventional approaches to treating cancer are mainly surgical excision, irradiation, and chemotherapy. In cancer therapy, surgical treatment is usually performed on patients with a resectable carcinoma. An integrated therapeutic approach, such as the addition of a delivery system loaded with an antiproliferative drug at the tumor resection site, is desirable. This will provide a high local concentration of a drug, that is, detrimental to malignant cells which may have survived surgery, thus preventing re-growth and metastasis of the tumor. The present review describes recent advances in systems for controlled release of antiproliferative agents. It describes basic concepts in drug delivery systems and antiproliferative drugs and then focuses on both types of systems: stents with controlled release of antiproliferative agents, and drug-eluting particles and implants for local cancer treatment. The last part of this article is dedicated to our novel drug-eluting composite fiber structures, which can be used as basic stent elements as well as for local cancer treatment.
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