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This phase 1 clinical trial tested the safety of intramuscular gene transfer by using naked plasmid DNA encoding the gene for VEGF, and analyzed the potential therapeutic benefits in patients with severe peripheral arterial disease (PAD). This study was an open-labeled, doseescalating, single-center trial on nine male patients with severe debilitating PAD who had not responded to conventional therapy. Seven had Buerger's disease and two had arteriosclerosis obliterans. Plasm id DNA (pCK) containing human VEGF165 was given by eight intramuscular injections in and around the area in need of new blood vessels. The study evaluated three escalating total doses (2, 4, and 8 mg of pCKVEGF165), with half of each total dose given four weeks apart. The follow-up duration was nine months. The gene injections were well tolerated without significant side effects or laboratory abnormalities related to gene transfer. Three patients showed transient edema in their extremities. Ischemic pain of the affected limb was relieved or improved markedly in six of seven patients. Ischemic ulcers healed or improved in four of six patients. The mean ankle-brachial index (ABI) improved significantly. Six of nine patients showed an increase in collateral vessels around the injection sites demonstrated by digital subtraction angiography. However, there was no relationship between the degree of ABI improvement and the dose given. Mean plasma levels of VEGF d id not increase significantly. In conclusion, intramuscular in jections of pCKVEGF165 can be performed safely to induce therapeutic angiogenesis in patients with severe PAD.

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