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(Circulation Research. 2001;89:389.)
© 2001 American Heart Association, Inc.

Reviews

Assessment of Risks Associated With Cardiovascular Gene Therapy in Human Subjects

Jeffrey M. Isner, Peter R. Vale, James F. Symes, Douglas W. Losordo

From the Shaughnessy Center for Clinical Genetics, St. Elizabeth’s Medical Center, Tufts University School of Medicine, Boston, Mass.

Correspondence to Jeffrey M. Isner, MD, St. Elizabeth’s Medical Center, 736 Cambridge St, Boston, MA 02493. E-mail VeJeff{at}aol.com

Abstract

Clinical trials of cardiovascular gene therapy, whether using viral (53%) or nonviral (47%) vectors, have thus far disclosed no evidence indicative of inflammatory or other complications, including death, directly attributable to the vector used. Indeed, despite the fact that initial trials of cardiovascular gene therapy targeted patients with end-stage vascular disease, including critical limb ischemia and refractory myocardial ischemia, the mortality for patients enrolled in clinical trials of cardiovascular gene therapy reported to date compares favorably with mortality for similar groups of patients in contemporary controlled studies of medical or interventional therapies. The most common morbidity reported after cardiovascular gene transfer is lower extremity edema; in contrast to data involving genetically engineered mice, however, evidence of life- or limb-threatening edema has not been described in any patients, including patients after gene transfer for myocardial ischemia. Concerns regarding the potential for angiogenic cytokines to promote the progression of atherosclerosis are not supported by angiographic follow-up of patients with coronary or peripheral vascular disease. The levels and duration of gene expression investigated for therapeutic angiogenesis transfer have been unassociated with hemangioma formation. Likewise, there is little evidence from either preclinical or clinical studies to support the notion that the administration of angiogenic growth factors, per se, is sufficient to stimulate the growth of neoplasms. Patients enrolled in clinical studies of angiogenic cytokines, including patients with diabetes and a previous history of retinopathy, have disclosed no evidence to suggest that ocular pathology is a risk of angiogenic growth factor gene transfer.

Key Words: gene therapy • coronary artery disease • peripheral vascular disease

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