Localized Intracoronary Gamma-Radiation Therapy to Inhibit the Recurrence of Restenosis after Stenting
Martin B. Leon, M.D., Paul S. Teirstein, M.D., Jeffrey W. Moses, M.D., Prabhakar Tripuraneni, M.D., Alexandra J. Lansky, M.D., Shirish Jani, M.D., S. Chiu Wong, M.D., David Fish, M.D., Stephen Ellis, M.D., David R. Holmes, M.D., Dean Kerieakes, M.D., and Richard E. Kuntz, M.D.
Background Although the frequency of restenosis after coronaryangioplasty is reduced by stenting, when restenosis developswithin a stent, the risk of subsequent restenosis is greaterthan 50 percent. We report on a multicenter, double-blind, randomizedtrial of intracoronary radiation therapy for the treatment ofin-stent restenosis.
Methods Of 252 eligible patients in whom in-stent restenosishad developed, 131 were randomly assigned to receive an indwellingintracoronary ribbon containing a sealed source of iridium-192,and 121 were assigned to receive a similar-appearing nonradioactiveribbon (placebo).
Results The primary end point, a composite of death, myocardialinfarction, and the need for repeated revascularization of thetarget lesion during nine months of follow-up, occurred in 53patients assigned to placebo (43.8 percent) and 37 patientsassigned to iridium-192 (28.2 percent, P=0.02). However, thereduction in the incidence of major adverse cardiac events wasdetermined solely by a diminished need for revascularizationof the target lesion, not by reductions in the incidence ofdeath or myocardial infarction. Late thrombosis occurred in5.3 percent of the iridium-192 group, as compared with 0.8 percentof the placebo group (P=0.07), resulting in more late myocardialinfarctions in the iridium-192 group (9.9 percent vs. 4.1 percent,P=0.09). Late thrombosis occurred in irradiated patients onlyafter the discontinuation of oral antiplatelet therapy (withticlopidine or clopidogrel) and only in patients who had receivednew stents at the time of radiation treatment.
Conclusions Intracoronary irradiation with iridium-192 resultedin lower rates of clinical and angiographic restenosis, althoughit was also associated with a higher rate of late thrombosis,resulting in an increased risk of myocardial infarction. Ifthe problem of late thrombosis within the stent can be overcome,intracoronary irradiation with iridium-192 may become a usefulapproach to the treatment of in-stent restenosis.
Source Information
From the Cardiovascular Research Foundation, Lenox Hill Hospital, New York (M.B.L., J.W.M., A.J.L.); the Scripps Clinic, La Jolla, Calif. (P.S.T., P.T., S.J.); CornellNew York Hospital, New York (S.C.W.); the Texas Heart Institute, Houston (D.F.); the Cleveland Clinic, Cleveland (S.E.); the Mayo Clinic, Rochester, Minn. (D.R.H.); Christ Hospital, Cincinnati (D.K.); and Brigham and Women's Hospital, Boston (R.E.K.).
Address reprint requests to Dr. Leon at the Cardiovascular Research Foundation, 130 E. 77th St., 9 Blackhall, New York, NY 10021, or at mleon{at}crf.org.
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