This study evaluates the addition of Eltrombopag after Hematopoietic stem cell transplantation (HSCT) to improve the engraftment of hematopoietic stem cell. Half of the participants will receive Eltrombopag,while the other will not receive the Eltrombopag.

With the progress of transplantation technology，allogeneic hematopoietic stem cell transplantation is becoming an important treatment for hematological diseases and the long-term survival of patients is gradually improved. However, thrombocytopenia after transplantation has always been an important complication. Studies have shown that about 20% patients had different degrees of thrombocytopenia. Eltrombopag could promote hematopoietic stem cell proliferation and differentiation in vitro studies. It has also been widely used in the treatment of immune thrombocytopenia (ITP) and aplastic anemia(AA) and increased platelet levels in such diseases. Eltrombopag is also used to treat poor platelet engraftment after transplantation and the effective rate is about 60%-80%. Therefore, the application of Eltrombopag at early time after transplantation might promote platelet engraftment and reduce platelet transfusions.

Inclusion Criteria:

1. Patients with definite diagnosis of hematological diseases, more than 30 kg, age18-60 years, gender and race are not limited;
2. Acceptance of allogeneic hematopoietic stem cell transplantation;
3. Voluntary acceptance of the study

Exclusion Criteria:

1. Patients with severe organ dysfunction or disease；
2. Patients who cannot tolerate oral Eltrombopag therapy;
3. Patients who refuse all-HSCT and Eltrombopag treatment;
4. Patients that investigator believed not suitable for enrollment.

Patients after allogeneic hematopoietic stem cell transplantation