Prospective study on the behaviour of the metalloprotease ADAMTS13 and of von Willebrand factor after bone marrow transplantation

F. Peyvandi, S. M. Siboni, D. Lambertenghi Deliliers, S. Lavoretano, N. De Fazio, B. Moroni, G. Lambertenghi Deliliers, P. Mannuccio Mannucci

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Thrombotic microangiopathies (TMAs) are rare but serious complications of bone marrow transplantation (BMT). Clinical manifestations are similar to those of thrombotic thrombocytopenic purpura (TTP), but prognosis is generally poorer despite plasma exchange. The enzymatic activity of the plasma metalloprotease ADAMTS13, which cleaves ultralarge thrombogenic multimers of von Willebrand factor (VWF) derived from activated endothelial cells, is very low or undetectable in patients with classic TTP, and protease deficiency is thought to play a mechanistic role in the formation of platelet thrombi in the microcirculation. This is the first prospective study to evaluate the incidence of TMA in 46 consecutively recruited patients undergoing autologous or allogeneic BMT and explore in parallel the behaviour of ADAMTS13, VWF antigen and VWF multimer size. The incidence of post-BMT TMA was 6% (three of 46); all cases occurred after allogeneic BMT. Compared with baseline values plasma ADAMTS13 activity was significantly reduced in patients undergoing BMT, particularly after the conditioning regimen (mean values: 50 ± 22 vs. 77 ± 32% P <0·0001). In the three patients who developed TMA, ADAMTS13 decreased after conditioning, but was very low in one case only (8%). VWF antigen levels progressively increased after the conditioning regimen (228 ± 75 vs. 178 ± 76% at baseline, P = 0·002). The mean proportion of high-molecular weight VWF multimers did not change in the various stages of BMT, even though ultralarge multimers were transiently found in same cases with and without TMA. Hence, the measurements evaluated in this study are not clinically useful to predict the occurrence of post-BMT TMA.

Original languageEnglish
Pages (from-to)187-195
Number of pages9
JournalBritish Journal of Haematology
Issue number2
Publication statusPublished - Jul 2006


  • ADAMTS13
  • Bone marrow transplantation
  • Thrombotic microangiopathies
  • Von Willebrand factor

ASJC Scopus subject areas

  • Hematology


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