An Open-label Study to Evaluate the Efficacy and Safety of Avatrombopag for the Treatment of Thrombocytopenia in Japanese Adults with Chronic Immune Thrombocytopenia
-Men and women >_18 years of age.
-Subject has a confirmed diagnosis of chronic ITP (>_12 months duration) and has had an insufficient response to a previous ITP treatment, in the opinion of the Investigator.
-Subject has an average of 2 platelet counts <30x10^9/L (no single count can be >35x10^9/L). The 2 samples must be obtained >_48 hours and <_2 weeks apart.
'-Subjects with known secondary immune thrombocytopenia (e.g., with known Helicobacter pylori-induced ITP, subjects infected with known human immunodeficiency virus [HIV] or hepatitis C virus [HCV] or subjects with known systemic lupus erythematosus).
-Subjects with known inherited thrombocytopenia (e.g., MYH-9 disorders) or hereditary thrombophilic disorders (e.g., Factor V Leiden, antithrombin III deficiency).
Subjects will receive a starting dose of 20 mg avatrombopag once daily and will be allowed to change their dose and dosing frequency (maximum dose 40 mg daily, minimum dose 20 mg once weekly) in accordance with their individual platelet responses.
介入コード / Code
介入キーワード /Keyword
主たる評価項目 / Primary Outcome(s)
26週間の投与期間中、救援療法を実施せずに、血小板数が50×10^9/L以上となった累積週数
The cumulative number of weeks in which the platelet count is >_50x10^9/L during 26 weeks of treatment in the absence of rescue therapy
副次的な評価項目 / Secondary Outcome(s)
Day 8における血小板反応率(Day 8に50×10^9/L以上の血小板数が認められた被験者の割合と定義)
Platelet response rate at Day 8 (as defined by the proportion of subjects with a platelet response >_50x10^9/L at Day 8).