Combination Regimen With Sodium Valproate for Severe Hemophilia: a Single-arm, Phase 1, Pilot Trial.

Inclusion Criteria: 1. Patients with clinically confirmed severe haemophilia; 2. Expected survival of ≥ 24 weeks with an ECOG score of 0-2; 3. Not having participated in another clinical trial within four weeks; 4. Informed consent signed by the patient or an immediate family member. Exclusion Criteria: 1. Those with other types of blood disorders diagnosed at the morphological or molecular level of the bone marrow; 2. Significantly abnormal cardiopulmonary function; 3. Hepatic or renal insufficiency; 4. Pregnancy or lactation, or inability to use contraception during the trial and for three months before the test and one year after administration 5. Persons who are allergic to the drugs likely to be used or where there is a contraindication to their use; 6. Those with severe uncontrollable infectious diseases or uncontrolled hypertension, malignancy, etc.; 7. Inability to cooperate with a regular follow-up due to psychological, social, family and other geographical circumstances; 8. Any other condition that, in the investigator's opinion, makes participation in this trial inappropriate.