Umbilical cord mesenchymal stem cells for COVID-19 acute respiratory distress syndrome: A double-blind, phase 1/2a, randomized controlled trial

Giacomo Lanzoni, Elina Linetsky, Diego Correa, Shari Messinger Cayetano, Roger A. Alvarez, Dimitrios Kouroupis, Ana Alvarez Gil, Raffaella Poggioli, Phillip Ruiz, Antonio C. Marttos, Khemraj Hirani, Crystal A. Bell, Halina Kusack, Lisa Rafkin, David Baidal, Andrew Pastewski, Kunal Gawri, Clarissa Leñero, Alejandro M.A. Mantero, Sarah W. MetalonisXiaojing Wang, Luis Roque, Burlett Masters, Norma S. Kenyon, Enrique Ginzburg, Xiumin Xu, Jianming Tan, Arnold I. Caplan, Marilyn K. Glassberg, Rodolfo Alejandro, Camillo Ricordi

Research output: Contribution to journalArticlepeer-review

83 Scopus citations


Acute respiratory distress syndrome (ARDS) in COVID-19 is associated with high mortality. Mesenchymal stem cells are known to exert immunomodulatory and anti-inflammatory effects and could yield beneficial effects in COVID-19 ARDS. The objective of this study was to determine safety and explore efficacy of umbilical cord mesenchymal stem cell (UC-MSC) infusions in subjects with COVID-19 ARDS. A double-blind, phase 1/2a, randomized, controlled trial was performed. Randomization and stratification by ARDS severity was used to foster balance among groups. All subjects were analyzed under intention to treat design. Twenty-four subjects were randomized 1:1 to either UC-MSC treatment (n = 12) or the control group (n = 12). Subjects in the UC-MSC treatment group received two intravenous infusions (at day 0 and 3) of 100 ± 20 × 106 UC-MSCs; controls received two infusions of vehicle solution. Both groups received best standard of care. Primary endpoint was safety (adverse events [AEs]) within 6 hours; cardiac arrest or death within 24 hours postinfusion). Secondary endpoints included patient survival at 31 days after the first infusion and time to recovery. No difference was observed between groups in infusion-associated AEs. No serious adverse events (SAEs) were observed related to UC-MSC infusions. UC-MSC infusions in COVID-19 ARDS were found to be safe. Inflammatory cytokines were significantly decreased in UC-MSC-treated subjects at day 6. Treatment was associated with significantly improved patient survival (91% vs 42%, P =.015), SAE-free survival (P =.008), and time to recovery (P =.03). UC-MSC infusions are safe and could be beneficial in treating subjects with COVID-19 ARDS.

Original languageEnglish (US)
Pages (from-to)660-673
Number of pages14
JournalStem Cells Translational Medicine
Issue number5
StatePublished - May 2021


  • cell transplantation
  • cellular therapy
  • clinical trials
  • mesenchymal stem cells
  • respiratory tract
  • transplantation
  • umbilical cord

ASJC Scopus subject areas

  • Developmental Biology
  • Cell Biology


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