Soluble TWEAK plasma levels predict expansion of human abdominal aortic aneurysms

ObjectivesDiminished soluble tumor necrosis factor-like weak inducer of apoptosis (sTWEAK) concentrations are associated with cardiovascular diseases. We have analyzed sTWEAK levels and its relation with expansion rate in subjects with abdominal aortic aneurysm (AAA).MethodssTWEAK levels were measured by ELISA.ResultssTWEAK concentrations were diminished in small AAA (≤5 cm; 353 ± 12 pg/mL; n = 25, p = 0.03) and large AAA (>5 cm; 315 ± 21 pg/mL; n = 18, p = 0.004) compared with healthy subjects (411 ± 22 pg/mL; n = 27). Moreover, sTWEAK concentrations were negatively associated with AAA size (r = −0.4; p = 0.008). sTWEAK was also negatively associated with AAA expansion rate with 5 years of follow-up (n = 79, r = −0.263; p = 0.031). Multivariate regression analysis revealed that sTWEAK levels were independently associated with AAA growth rate (β = −0.208; p = 0.046).ConclusionssTWEAK plasma levels were decreased in subjects with AAA and were independently related with AAA expansion rate indicating that this protein could be a novel diagnostic and prognostic biomarker of AAA.