Lusutrombopag in the Treatment of Immune Thrombocytopenia (ITP)

Participants receive lusutrombopag 3 mg administered orally once a day for up to 4 weeks and doses are adjusted based on platelet counts during week 5-12. If a subject's platelet count remains \< 50x10\^9 /L, the dose could have been increased up to a maximum dose of 6 mg（2 tablets).If a subject's platelet count reaches ≥ 250x10\^9 /L during the first 4 weeks, treatment is stopped and participants are allowed to enter into Titration Study in advance when platelet count drops to ≥100x10\^9 /L.