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The multicenter study conducted by Lorente and coworkers - published in the previous issue of Critical Care - suggests that levels of tissue inhibitor of metalloproteinase (TIMP)-1 in association with the 372 T/C genetic polymorphism of TIMP-1 are promising markers to predict the clinical outcome of septic patients. TIMPs bind to active matrix metalloproteinases and, amongst other effects, inhibit their proteolytic activity of the extracellular matrix. Previous clinical studies showed increased plasma levels of TIMP-1 in nonsurvivors of sepsis, and showed associations between the 372 T/C genetic polymorphism of TIMP-1 and increased risk of developing certain diseases. In recent years, there has been great interest in understanding whether genetic determinants of the host response to systemic infections are associated with poor outcome. Furthermore, the pharmacogenomics of sepsis may allow us to target immune-modulating therapies. Measurement of TIMP-1 protein levels and TIMP-1 polymorphism 372 T/C in the intensive care setting could therefore be an attractive noninvasive tool to determine the outcome of septic patients, and might help to select patients potentially benefitting from a target-specific immune-modulatory therapy directed to matrix metalloproteinase/TIMP homeostasis.

TIMP-1 gene polymorphism: are genetics able to predict outcome of septic patients?