The DART Study- Daratumumab Treatment in ITP

Inclusion Criteria: 1. Male or female aged ≥18 years. 2. Primary ITP with a platelet count of ≤30x109/L measured within 2 weeks prior to inclusion with failure to achieve response or relapse after corticosteroid therapy, and at least one second-line therapy including rituximab (last infusion ≥ 24 weeks before study inclusion) and/or TPO-RA. The dose of steroids or/and TPO-RAs (romiplostim, eltrombopag and avatrombopag) has not been changed during the last 2 weeks preceding the inclusion. For the safety run-in phase, a platelet count of 15-30x 109/L will be required. 3. Signed and dated written informed consent. 4. Females of child-bearing potential accepting to follow effective contraceptive methods for at least 24 weeks following the administration of first daratumumab injection. A man who has not had a vasectomy and who is sexually active with a woman of childbearing potential must agree to use a barrier method of birth control e.g., a condom with spermicidal foam/film/gel/cream/suppository, and all men must also not donate sperm during the study and for 3 months following discontinuation of Daratumumab Exclusion Criteria: 1. Patients with active bleeding during the last 7 days prior to inclusion. Active bleeding is defined as any clinically overt hemorrhage (including radiologically diagnosed bleeding) with ongoing hemoglobin fall or bleeding requiring immediate intervention. 2. Pregnancy or lactation. 3. Surgery planned within the 3 next months. 4. Secondary ITP: ITP associated with lymphoma, chronic lymphocytic leukemia, drug induced or ITP secondary to autoimmune disorders such as systemic lupus erythematosus, rheumatoid arthritis, antiphospholipid syndrome, common variable immune deficiency, human immunodeficiency virus, or hepatitis C. 5. Concomitant autoimmune hemolytic anemia. 6. Known allergy and/or sensitivity or contraindication to daratumumab. 7. Current active malignancy likely to require chemotherapy or surgical treatment during the study period or within one year after the start of the study treatment. 8. Patients with history of poor compliance or history of alcohol/drug abuse or excessive alcohol beverage consumption that would interfere with the ability to comply with the study protocol, or current or past psychiatric disease that might interfere with the ability to comply with the study protocol or give informed consent. 9. Patient unable to attend all the visits planned for the trial. 10. Positive at screening for hepatitis B virus (HBV) surface and core antibodies unrelated to vaccination: * patients with positive HBV surface antigen (HbsAg) are not eligible * patients who are HbsAg negative and HBV core antigen antibody positive (HBcAb) will be tested for HBV surface antibody (HBsAb) and HBV DNA. If HBsAb titer is \>1000 IU/ml, patients may be enrolled. Monthly HBV DNA monitoring will be required while on treatment and for the 6 months after the last dose of the study drug. * patients who are HBcAb positive, HBsAg negative with HBsAb titer \<100 IU/ml or negative, are not eligible. 11. Known chronic obstructive pulmonary disease (COPD) with a forced expiratory volume in 1 second (FEV1) \<50% of predicted normal. Note that FEV1 testing is required for participants suspected of having COPD. 12. Known moderate or severe persistent astma within the past 2 years, uncontrolled asthma of any classification. 13. Patient participating in another clinical trial with an investigational drug.