A Safety and Efficacy Study of Defibrotide in the Prevention of Chimeric Antigen Receptor-T-cell-associated Neurotoxicity

Inclusion Criteria: 1. Subject must be ≥ 18 years of age at signing of informed consent. 2. Subject must be diagnosed with relapsed or refractory DLBCL (including DLBCL not otherwise specified, primary mediastinal large B-cell lymphoma, high grade B-cell lymphoma, and DLBCL arising from follicular lymphoma) and scheduled to receive treatment with Yescarta. 3. Female subjects of childbearing potential who are sexually active and male subjects who are sexually active and have female partners of childbearing potential must agree to use a highly effective method of contraception with their partners during exposure to defibrotide and for 30 days after the last dose of defibrotide. 4. Subject must be able to understand and sign written informed consent. Exclusion Criteria: 1. Subject is currently receiving dialysis or expected to receive dialysis. 2. Subject has used any investigational anticancer agent within 3 weeks prior to the first dose of defibrotide, or is using or plans to use any investigational agent during the study. 3. Subject has previously been treated with CAR-T therapy. 4. Hemodynamic instability requiring vasopressors or uncontrolled hypertension with persistent systolic blood pressure \> 180. 5. Subject has clinically significant active bleeding, history of intracranial bleeding, or is at risk for intracranial bleeding as determined by the Investigator. 6. Subject plans to use any medication that increases the risk of bleeding. 7. Subject is pregnant or lactating and does not agree to stop breastfeeding. 8. Subject has a known history of hypersensitivity to defibrotide or any of the excipients. 9. Subject has primary CNS lymphoma.