title: A randomized, double-blind, placebo-controlled, dose-escalation study of intravenous adult human mesenchymal stem cells (prochymal) after acute myocardial infarction.
abstract: OBJECTIVE
  Our aim was to investigate the safety and efficacy of intravenous allogeneic human mesenchymal stem cells (hMSCs) in patients with myocardial infarction (MI).
  
  
  BACKGROUND
  Bone marrow-derived hMSCs may ameliorate consequences of MI, and have the advantages of preparation ease, allogeneic use due to immunoprivilege, capacity to home to injured tissue, and extensive pre-clinical support.
  
  
  METHODS
  We performed a double-blind, placebo-controlled, dose-ranging (0.5, 1.6, and 5 million cells/kg) safety trial of intravenous allogeneic hMSCs (Prochymal, Osiris Therapeutics, Inc., Baltimore, Maryland) in reperfused MI patients (n=53). The primary end point was incidence of treatment-emergent adverse events within 6 months. Ejection fraction and left ventricular volumes determined by echocardiography and magnetic resonance imaging were exploratory efficacy end points.
  
  
  RESULTS
  Adverse event rates were similar between the hMSC-treated (5.3 per patient) and placebo-treated (7.0 per patient) groups, and renal, hepatic, and hematologic laboratory indexes were not different. Ambulatory electrocardiogram monitoring demonstrated reduced ventricular tachycardia episodes (p=0.025), and pulmonary function testing demonstrated improved forced expiratory volume in 1 s (p=0.003) in the hMSC-treated patients. Global symptom score in all patients (p=0.027) and ejection fraction in the important subset of anterior MI patients were both significantly better in hMSCs versus placebo subjects. In the cardiac magnetic resonance imaging substudy, hMSC treatment, but not placebo, increased left ventricular ejection fraction and led to reverse remodeling.
  
  
  CONCLUSIONS
  Intravenous allogeneic hMSCs are safe in patients after acute MI. This trial provides pivotal safety and provisional efficacy data for an allogeneic bone marrow-derived stem cell in post-infarction patients. (Safety Study of Adult Mesenchymal Stem Cells [MSC] to Treat Acute Myocardial Infarction; NCT00114452).
authors: Department of Medicine, Cardiovascular Division and the Interdisciplinary Stem Cell Institute, Miller School of Medicine, University of Miami, Miami, Florida 33136, USA. jhare@med.miami.edu
authors: Joshua M
authors: JM
authors: Hare
authors: Jay H
authors: JH
authors: Traverse
authors: Timothy D
authors: TD
authors: Henry
authors: Nabil
authors: N
authors: Dib
authors: Robert K
authors: RK
authors: Strumpf
authors: Steven P
authors: SP
authors: Schulman
authors: Gary
authors: G
authors: Gerstenblith
authors: Anthony N
authors: AN
authors: DeMaria
authors: Ali E
authors: AE
authors: Denktas
authors: Roger S
authors: RS
authors: Gammon
authors: James B
authors: JB
authors: Hermiller
authors: Mark A
authors: MA
authors: Reisman
authors: Gary L
authors: GL
authors: Schaer
authors: Warren
authors: W
authors: Sherman
mesh_terms: D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007262:Infusions, Intravenous; D008297:Male; D045164:Mesenchymal Stem Cell Transplantation / Q000379:methods; D008875:Middle Aged; D009203:Myocardial Infarction / Q000601:surgery*