ADAMTS13 activity will be evaluated on day 7 after the end of daily PE and every 7 days until ADAMTS13 activity ≥ 20% is reached. In case of persistent severe ADAMTS13 deficiency (≤ 20%), caplacizumab administration could be extended for a maximum of 58 days after the end of the daily PE period and should be accompanied by an adjusted immunosuppressive therapy as needed. This duration is in accordance with the HERCULES study protocol and its SmPC.
The aim of the study is to evaluate the efficacy of a personalized caplacizumab regimen based on ADAMTS13 activity monitoring in adult acquired thrombotic thrombocytopenic purpura (aTTP): This study is a phase II, prospective, multicenter non-inferiority single-arm study.