Testing the Effect of Teclistamab on Recurrent Plasmablastic Lymphoma

Inclusion Criteria: * Patients must have histologically or cytologically confirmed R/R PBL * Patients must have measurable disease, defined as at least one bi-dimensionally measurable nodal lesion, defined as ≥ 1.5 cm in its longest dimension, or at least one bi-dimensionally measurable extranodal lesion, defined as ≥ 1.0 cm in its longest dimension * Patients should have ≥ 1 line of prior therapy. This includes at least 1 prior line of chemotherapy or radiation * Age ≥ 18 years. Because no dosing or adverse event data are currently available on the use of teclistamab in patients \< 18 years of age, children are excluded from this study * Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2 (Karnofsky ≥ 60%) * Absolute neutrophil count ≥ 1,000/mcL * Platelets ≥ 75,000/mcL * Total bilirubin ≤ 1.5 institutional upper limit of normal (ULN) * Aspartate aminotransferase (AST)(serum glutamic oxaloacetic transaminase \[SGOT\])/alanine aminotransferase (ALT)(serum glutamic pyruvic transaminase \[SGPT\]) ≤ 3 x institutional ULN * Glomerular filtration rate (GFR) ≥ 30 mL/min/1.73 m\^2 * Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial * For patients with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated * Patients with a history of hepatitis C virus (HCV) infection must have been …