TPO-RA in Primary Immune Thrombocytopenia (ITP) in Patients Older Than 14 Years

The subjects will receive an initial dose of TPO-RA once daily. Platelet counts were collected weekly until week 6 of the study. Dosage was adjusted to maintain platelet levels between 50×10\^9/L and 150×10\^9/L according to platelet count. TPO-RA was administered once a day for 4 weeks. If the platelet count dose not reach 30×10\^9/L, the treatment was stopped. If the platelet count is more than 400×10\^9/L after taking TPO-RA once a day for 2 consecutive weeks, the treatment will be stopped.