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Review
. 2019 Aug 13;3(15):2424-2435.
doi: 10.1182/bloodadvances.2019000143.

Allogeneic reactivity-mediated endothelial cell complications after HSCT: a plea for consensual definitions

Affiliations
Review

Allogeneic reactivity-mediated endothelial cell complications after HSCT: a plea for consensual definitions

Simona Pagliuca et al. Blood Adv. .

Abstract

Endothelial cell (EC) activation has been suspected of triggering a group of rare and dismal complications that can occur after allogeneic hematopoietic stem cell transplantation (HSCT). Capillary leak syndrome, engraftment syndrome, transplant-associated microangiopathy, diffuse alveolar hemorrhage, and idiopathic pneumonia syndrome are the main nosological entities. Post-HSCT endotheliitis can be triggered by chemotherapy, infections, and calcineurin inhibitors, but allogeneic reactivity is claimed to be the common denominator. Endothelial damages are thought to activate several deleterious pathways (proapoptotic, procoagulant, proinflammatory) and can lead to multiorgan failure; however, clinical manifestations of each syndrome overlap, and their relationship with graft-versus-host disease could be minimal. The lack of well-defined diagnostic criteria does not allow for a clear-cut comparison in the current literature. Therapeutic efforts have been made to intercept the pathogenic mechanisms leading to EC dysfunction, but remission rates and survival remain mostly unsatisfactory. In this article, we have reviewed the incidence, clinical features, and treatment approaches of EC activation syndromes, and we plead for the development of internationally accepted standard definitions.

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Conflict of interest statement

Conflict-of-interest disclosure: The authors declare no competing financial interests.

Figures

None
Graphical abstract
Figure 1.
Figure 1.
Spectrum and pathophysiology of post-HSCT endothelial complications. The Venn diagram highlights the overlap of endothelial syndromes, both diagnostically and pathophysiologically, with GVHD. Many clinical and pathophysiological features of GVHD parallel those of other EC activation syndromes in which a single organ is targeted. Here, atherosclerosis and several delayed forms of IPS have been proposed as late endothelial dysfunction syndromes overlapping with chronic GVHD. DAH, diffuse alveolar hemorrhage; PERDS, peri-engraftment respiratory distress syndrome.
Figure 2.
Figure 2.
Proposed management of endothelial syndromes.

References

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MeSH terms