Study to Evaluate Combined Treatment of Daratumumab, Bortezomib and Dexamethasone in PBL Patients.

Inclusion criteria

• . Histologically confirmed plasmablastic lymphoma according to WHO 2017, CD38-positive by immunohistochemistry (≥5% of positive cells) Local diagnosis of PBL and local CD38 assessment ≥5% will suffice for enrollment and start of treatment.
• . Patients with plasmablastic lymphoma relapsed or refractory:
• . ECOG Performance Status ≤ 3;
• . Age ≥ 18 years;
• . Both HIV-negative and HIV-positive patients are eligible;
• . HIV infection responsive to ongoing cART (combination antiretroviral therapy);
• . At least one measurable disease lesion identifiable by imaging:
• . Women of childbearing potential (WOCBP) and men must agree to use effective contraception if sexually active. This applies for the time period between signing of the informed consent form and 7 months (for women) o 4 months (for men) after last administration of bortezomib or 6 months after last daratumumab dose, regardless of sex. A woman is considered of childbearing potential, i.e., fertile, following menarche and until becoming postmenopausal unless permanently sterile. Permanent sterilization methods include but are not limited to hysterectomy, bilateral salpingectomy and bilateral oophorectomy. A postmenopausal state is defined as no menses for continuous 12 months without an alternative medical cause. A high follicle stimulating hormone (FSH) level in the postmenopausal range may be used to confirm a postmenopausal state in women not using hormonal contraception or hormonal replacement therapy. The investigator or a designated associate is requested to advise the patient how to achieve highly effective birth control method (failure rate of less than 1%) e.g., intrauterine device (IUD), intrauterine hormone-releasing system (IUS), bilateral tubal occlusion, vasectomized partner, and sexual abstinence. The use of condoms by male patients is required unless the female partner is permanently sterile.