This clinical trial is studying treatments for B-cell Non-Hodgkin Lymphoma that has come back or not responded to previous treatments in children and young adults. The study will test several medications including odronextamab, loncastuximab tesirine, and combinations of chemotherapy drugs including rituximab, ifosfamide, carboplatin, etoposide, and dexamethasone.
The purpose of this study is to evaluate how well these treatments work in patients whose lymphoma has returned or did not respond to initial treatment. The study is divided into different treatment groups, with some patients receiving new targeted therapies while others receive combinations of standard chemotherapy medications.
During the study, patients will receive their assigned treatment and have regular medical evaluations to check how well the treatment is working. The treatment period may last up to 24 months, depending on which medication group the patient is assigned to. Doctors will monitor patients’ response to treatment using imaging scans and other medical tests to assess if the cancer is responding to the therapy.



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