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Why Activated Protein C Was Not Successful in Severe Sepsis and Septic Shock: Are We Still Tilting at Windmills?

  • Sepsis and ICU (J Russell, Section Editor)
  • Published:
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Abstract

Drotrecogin alpha activated (DAA), trade name Xigris, is a recombinant human protein C that has been the subject of controversy since 2001, when it became the first biologic agent approved for the treatment of severe sepsis and septic shock. The PROWESS trial showed a 6.1 % absolute reduction in 28-day mortality, although these findings were not replicated in later trials, ultimately leading to the withdrawal of DAA in 2011. Observational trials, however, have consistently shown a mortality benefit with the use of DAA, leading to the following questions: Did DAA truly fail and, if so, why? While these questions may never be definitively answered on the basis of available evidence, several factors may explain the conflicting results. In clinical practice, DAA may have been preferentially given to subjects more likely to survive. Contemporary treatments, including early antibiotic administration and volume resuscitation, may have mitigated the inflammatory processes leading to disordered coagulation and microvascular thrombosis and, thus, reduced or abolished the therapeutic opportunity for DAA. Later randomized clinical trials of DAA focused on the clinical phenotype of refractory shock, largely due to a strong efficacy signal in this subset from PROWESS; however, this clinical phenotype may not be tightly linked, at least after contemporary early resuscitation strategies, to the mechanistic phenotype of dysregulated coagulation that may have been a better target for DAA. Future trials of biologic therapies in severe sepsis and septic shock should use a combination of clinical phenotype and biomarkers to identify responsive populations that may benefit from such therapies.

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Abbreviations

DAA:

Drotrecogin alpha activated

PAC:

Pulmonary artery catheter

rhAPC:

Recombinant human activated protein C

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Conflict of Interest

Peggy S. Lai declares no conflict of interest.

Taylor Thompson has been a board member for Astra Zeneca; has been a consultant for Sirius Genetics, Immunetrics, and Lilly; and has received grant funding from NHLBI.

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This article does not contain any studies with human or animal subjects performed by any of the authors.

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Correspondence to B. Taylor Thompson.

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Lai, P.S., Thompson, B.T. Why Activated Protein C Was Not Successful in Severe Sepsis and Septic Shock: Are We Still Tilting at Windmills?. Curr Infect Dis Rep 15, 407–412 (2013). https://doi.org/10.1007/s11908-013-0358-9

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